Parteid lubavad valimiste eel pealinlastele toetusi / Urmas Seaver

Index Scriptorium Estoniae

Seaver, Urmas, 1973-

2005-01-01

Erakonnad lubavad valimiste eel pealinlastele uusi soodustusi - alanevat maamaksu, lastehoiuraha, toetusi lastele ja pensionäridele. Näiteks Reformierakond lubab maamaksu alandada kaks korda. Lisa: Erakonnad peibutavad soodustustega

"Tsvet i forma" dlja detei / Irina Butjajeva

Index Scriptorium Estoniae

Butjajeva, Irina

2004-01-01

Kolmepäevasest kunstilaagrist "Värv ja vorm" 7-12 lastele Adamson-Ericu muuseumis ja Niguliste muuseum-kontserdisaalis. Lapsed tutvuvad muuseumi väljapanekutega, kuulavad loenguid ja joonistavad ise

Lasteravimite konverents Rotterdamis : [4.-7. juuni 2008] / Jana Lass

Index Scriptorium Estoniae

Lass, Jana, 1979-

2008-01-01

4.-7. juunini toimus Rotterdamis Euroopa Arengufarmakoloogia, Perinatoloogia ja Pediaatrilise Farmakoloogia Seltsi (European Society for Developmental, Perinatal and Pediatric Pharmacology, ESDP) 11. konverents teemal "Ohutud ja efektiivsed ravimid lastele"

Meditsiinidoktor Marje Oona / Heidi-Ingrid Maaroos

Index Scriptorium Estoniae

Maaroos, Heidi-Ingrid, 1942-

2005-01-01

Tartu Ülikooli polikliiniku ja perearstiteaduse õppetooli assistendi ja teaduri Marje Oona doktoritöö "Helicobacter pylori infektsioon lastel : epidemioloogilisi ja ravi aspekte" kaitsmisest Tartu Ülikoolis 12. jaanuaril 2005

Ella Treffner - 110 / Mare Torm

Index Scriptorium Estoniae

Torm, Mare, 1947-

2000-01-01

Eesti kasvatusteadlane, eriti eelkooliealise kasvatuse osas, Ella Eweline Treffner (s. Välk) - 1920.-1930. aastail tegutses aktiivselt Tartu Naisseltsis, Tartu Lasteaia Seltsis, tegeles ka kirjandusliku loominguga lastele, tõlkis lastekirjandust

Sisustusgiidi uudised / Mari Masso

Index Scriptorium Estoniae

Masso, Mari

2007-01-01

Standardi uuest kapiseeriast (disainer Katrin Soans) ja koostööst Jaapani toolitootja Okamuraga; helisummutavatest seinapaneelidest; Verner Pantoni toolist lastele; Alberto Meda pöörlevast töötoolist

Ugala kolmiklöök Draamas

Index Scriptorium Estoniae

1999-01-01

25. okt Ugala külalisetendused Eesti Draamateatris. Esitatakse David Harroweri "Noad kanade sees" Andres Lepiku lavastuses, Per Olov Enquisti "Pildimeistrid" Kaarin Raidi lavastuses ja lastele "Sõbrad, kurikaelad ja muud elukad"

Minu positsioon on kaugel kodakondsuse nullvariandist / Paul Alan Goble

Index Scriptorium Estoniae

Goble, Paul Alan, 1949-

1998-01-01

Vastukaja artiklile: Rüütel, Ingrid. Kodakondsuse uus nullvariant seadustamisel // Sõnumileht, 19. okt.. 1998. Kodakondsusseaduse muutmise seaduse eelnõust, mille kohaselt antakse kõikidele Eestis sündinud lastele Eesti kodakondsus

Kagu-Eesti kodune (lapsekeskne) laulmistraditsioon aastal 2000. II : lauljad ja laulud / Anu Vissel

Index Scriptorium Estoniae

Vissel, Anu

2005-01-01

Artikli aluseks on ankeetküsitluse vastused, mis on saadud 2000. aastal Võru ja Põlva maakonna peredest. Selgitatakse, kes laulavad lastele, millistes olukordades, lähemalt analüüsitakse unelaule

Otsnjato 50 pljonok / Andrei Babin

Index Scriptorium Estoniae

Babin, Andrei

2004-01-01

Noorte fotograafide konkursi "Fotoproov" võitjad õpetavad Kirde-Eesti riskiperede lastele fotografeerimist. Kaasas oli konkursil osalenute fotonäitus, mida tallinlased nägid Pedagoogikaülikoolis. Vaata "DD" 2.07.2004

Festival PostsovkhoZ kulmineerub täna / Siram

Index Scriptorium Estoniae

Siram, pseud., 1968-

2005-01-01

Kunstifestivalist "PostsovkhoZ 5/Avalik - era" Moostes, 13. VIII toimuvatest üritustest. Marisa Jahn USAst korraldab lastele seinamaali õpikoja ja kureerib festivali satelliitnäitust "Unfurled" Tartus Y-galeriis, kus koondub lipumotiiviga kunst

Kallis müügitrikk laste arvel / Priit Pullerits

Index Scriptorium Estoniae

Pullerits, Priit, 1965-

2010-01-01

Piret Raua digitaalsest pildiraamatust lastele "Emma roosad asjad" (Suurbritannia : WingedChariot, 2010), mida on võimalik kasutada Apple´i elektroonikatoodetes iPad, iPhone ja iPod (eesti, inglise ja jaapani keeles)

Nastojashtsheje volshebstvo bõvajet ne tolko v skazkah / Anna Orshanskaja

Index Scriptorium Estoniae

Orshanskaja, Anna

1999-01-01

Juri Plenini kirjutatud ja lavastatud jõulunäidend lastele "Santa-Klausi kuldkelluke" Kultuurimajas "Rugodiv". Mängivad täiskasvanud ja lapsed stuudiotest "Shkola klounov", "Komiksõ" ja Natalja Mõttuse juhtimisel tegutsevast lastestuudiost "Jun-Osta"

Olelusvõitlus bioloogiarindel / Helen Urbanik

Index Scriptorium Estoniae

Urbanik, Helen

2002-01-01

Ameerika koolides tahetakse lastele darvinismi asemel õpetada teooriat, mis ei püüagi elu tekkimist Maal selgitada. Mõtteviisist, mida nimetatakse mõistuspärase loomise teooriaks (intelligent design theory ehk lühidalt ID teooria)

Taani eeskuju: maa tuleb täita lasteteatritega / Silvia Soro

Index Scriptorium Estoniae

Soro, Silvia

2010-01-01

Projekti "Näitekirjanike kasvulava" raames 17.-23. septembrini toimunud eesti kirjanike ja teatriinimeste õppereisist Taani. Taani lastele ja noortele mängitavate väiketeatrite süsteemist. 17.-19. septembrini Horsensis toimunud laste- ja noorteteatrite festivalist

Eesti kool on kohaliku kogukonna alustala / Ede Schank Tamkivi

Index Scriptorium Estoniae

Schank Tamkivi, Ede, 1980-

2015-01-01

Üle nädala San Mateos ja Berkeleys koos käiv eesti kool annab San Francisco Bay Area eesti lastele võimaluse saada kodumaast eemal viibides veidi emakeelset haridust ja suhelda teiste omaealistega eesti keeles

Peatükk elavat hariduslugu : Elfriede Lenderi gümnaasiumi lugu kaante vahel / Arvo Mägi

Index Scriptorium Estoniae

Mägi, Arvo, 1913-2004

2000-01-01

rets. rmt.: Lender, Elfriede. Minu lastele. 2. tr. Tallinn : Elfriede Lenderi Gümnaasiumi vilistlaskogu, 2000. 307 lk. (Lenderi kooli lugu. I); Elfriede Lenderi Gümnaasium. Tallinn : Elfriede Lenderi Gümnaasiumi vilistlaskogu, 2000. 344 lk. (Lenderi kooli lugu. II)

Digitaalse kirjaoskuseta enam ei saa / Andres Jõesaar

Index Scriptorium Estoniae

Jõesaar, Andres, 1959-

2015-01-01

Digikirjaoskusest, ristmeedia tootmisest. Hea lugu ja selle oskuslik edasiandmine digitehnoloogia vahendusel. Balti Filmi- ja Meediakooli ristmeedia tootmise bakalaureuse õppekava teise aasta tudengite tööst "Monsters to clowns", mis on lastega seotud ja lastele suunatud rahvusvaheline ristmeediaprojekt

Narnia - imedemaa riidekapis / Mare Müürsepp

Index Scriptorium Estoniae

Müürsepp, Mare

2006-01-01

Eestik. ilm.: Lewis, Clive Staples. Lõvi, nõid ja riidekapp ; Prints Caspian ; Imetegija õepoeg ; Hobune ja tema poiss : [jutustused lastele. Tallinn] : Logos, 1995-2000. (Narnia lood). Ka2005.a. USA-s Andrew Adamsoni lavastatud samanimelisest mängufilmist

Rikkad lõvid korjasid toidupoes kroonikaupa miljoni

Index Scriptorium Estoniae

2008-01-01

Pärnu kontserdimajas toimunud Lions-liikumise aastaballil annetasid Eesti Lions-klubide esindajad heategevuskampaania "Saa nägijaks!" raames kogutud 1,43 miljonit krooni pimedatele lastele ja noortele. Tänusõnad ütles ettevõtmise aupatroon proua Evelin Ilves

Eesti animafilm võitis UNICEFi auhinna

Index Scriptorium Estoniae

2007-01-01

A Film Eesti lastelühianimafilm (režissöörid Aina Järvine ja Meelis Arulepp) tunnistati parimaks haridus- ja sotsiaalteemaliseks filmiks 19.-22. aprillini Itaalias toimunud "Cartoons on the Bay" festivalil ja sai Pulcinella auhinna

Sügisest algkoolides tasuta puuvili / Mirko Ojakivi

Index Scriptorium Estoniae

Ojakivi, Mirko

2009-01-01

Kokku kavatsevad riik ja Euroopa Liit aastas lastele jagada 6. miljoni krooni eest puuvilju. Loe ka: Eesti suuremat köögiviljakasvandust pidava Kadarbiku talu peremehe Ants Paki arvamust "Sada grammi nädalas on vähe"

Ugalas valmivad uuslavastused suurtele ja väikestele / Helle Leppik

Index Scriptorium Estoniae

Leppik, Helle

2009-01-01

Ugala teatris esietendub 27. novembril "Nii nagu taevas", mille on Kay Pollaki samanimelise filmi järgi dramatiseerinud Sofia Aminoff, lavastanud Ingo Normet. Valmimas on jõululavastus lastele "Nähtamatu varandus". Silvia Soro näidendi lavastab Leino Rei

Muinasjutt, mis ootas pool sajandit / Sirje Maasikamäe

Index Scriptorium Estoniae

Maasikamäe, Sirje, 1963-

1995-01-01

Lavastaja Grigori Kromanov. Mälestused, artiklid, kirjad, päevikud / koost. Irena Veisaite-Kromanova; Panso, Voldemar. Töö ja talent näitleja loomingus; Sinine vöö : Valik muinasjutte / Kkoost., tlk. ja lastele jutustanud Ene ja Paul Ambur

Magustoit filmihuvilistele lastele / Maris Balbat

Index Scriptorium Estoniae

Balbat, Maris, 1936-

2002-01-01

25. oktoobrist tuleb Coca-Cola Plaza ekraanile USA joonisfilm "Jääaeg" ("Ice Age"), mille dubleerimisse on režissöör Janno Põldma juhtimisel kaasatud head eesti näitlejad Anu Lamp, Lembit Ulfsak, Marko Matvere jt

Müüdid ja põhitõed maailmapildi kujunemisel / Aino Pervik

Index Scriptorium Estoniae

Pervik, Aino, 1932-

2005-01-01

Eestimaal toimivast edumüüdist, mis on ka enam-vähem ainuke põlvkondi ühendav tõekspidamine ja maailmapildi kujunemisest lastel, mis peaks vastama ka tegelikult sellele, mis inimese ümber toimub ning lastekirjanduse osast selle kujunemisel

MID idjot v nastuplenije / Aleksandra Manukjan

Index Scriptorium Estoniae

Manukjan, Aleksandra

2004-01-01

Välisminister Kristiina Ojuland tegi kokkuvõtte välisministeeriumi poolaasta tööst, rääkis Venemaaga piirilepingu allakirjutamisest, Venemaa süüdistustest vähemusrahvuste olukorra pärast, Tšetšeeni lastele viisade mitteandmisest

Goltsman Ballet hakkab lapsi õpetama

Index Scriptorium Estoniae

2014-01-01

Tantsutrupp Goltsman Ballet asutaja, kunstilise juhi ja tänapäevase balletikunsti pedagoog Maria Goltsmani sõnul hakkab tantsutrupp andma tantsutunde 5-7-aastastele lastele, esialgu Tallinnas. Detsembri lõpus esitles Goltsman Ballet uut tantsuetendust "Blue", lavastajaks Krista Köster

"Goltsman Ballet" начинает обучать малышей

Index Scriptorium Estoniae

2014-01-01

Tantsutrupp Goltsman Ballet asutaja, kunstilise juhi ja tänapäevase balletikunsti pedagoog Maria Goltsmani sõnul hakkab tantsutrupp andma tantsutunde 5-7-aastastele lastele, esialgu Tallinnas. Detsembri lõpus esitles Goltsman Ballet uut tantsuetendust "Blue", lavastajaks Krista Köster

VAT-teater vaatab 30 aastat tulevikku / Tiiu Laks

Index Scriptorium Estoniae

Laks, Tiiu, 1984-

2010-01-01

VAT Teater toob S. Becketti "Krappi viimase lindi" lavale ebatavalisel moel. Festivalil "Draama 2010" Tartus toimub 8. septembril esimene avalik lindistus "...viimane lint / Saare esimene lint". Kontseptsioon: Tanel Saar ja Co. Esitus: Tanel Saar ja Hanna Allsaar. Näitejuhid-konsultandid: Rait Avestik ja Aare Toikka. "Krappi viimane lint" esietendub VAT Teatri ja Tanel Saare esituses 2040. a. sügisel. Festivali "Draama 2010" kavast

A comparative study of commercial free speech and limiting advertising in North America and continental Europe : [teadusmagistritöö] / Katrin Saaremäel-Stoilov ; Tartu Ülikool, õigusteaduskond ; juhendajad: Raul Narits, A. Sajo

Index Scriptorium Estoniae

Saaremäel-Stoilov, Katrin

2003-01-01

Kaubandusliku sõnavabaduse mõiste, kaubanduslik sõnavabadus ja lastele suunatud ning eksitava reklaami piirangud Ameerika Ühendriikides ja Kanadas, kaubanduslik sõnavabadus Saksamaal ja Eestis, lisaks Euroopa Nõukogu ja Euroopa Liidu vastavad konventsioonid. - Kaitses 22. 08. 2003. a. Tartu Ülikoolis

Piret Raud avaldas iPadi-raamatu

Index Scriptorium Estoniae

2010-01-01

Arvustus: Raud, Piret. Emma roosad asjad. Tallinn : Tammerraamat, 2010 ; Raud, Piret. Emma roosad asjad : [digitaalne pildiraamat lastele. Suurbritannia] : WingedChariot, 2010. Teost on võimalik kasutada Apple´i elektroonikatoodetes iPad, iPhone ja iPod (eesti, inglise ja jaapani keeles)

Lühianimafilm "Väike lühinägelik boamadu" võitis UNICEF-i auhinna

Index Scriptorium Estoniae

2007-01-01

A Film Eesti lastelühianimafilm (loo autor Andry Ervald, režissöörid Aina Järvine ja Meelis Arulepp) tunnistati parimaks haridus- ja sotsiaalteemaliseks filmiks 19.-22. aprillini Itaalias toimunud "Cartoons on the Bay" festivalil ja sai Pulcinella auhinna

Lapsed väärivad head teatrit, mitte haltuurapalagani / Toomas Tross, Hiie Fluss ; intervjueerinud Meeli Parijõgi

Index Scriptorium Estoniae

Tross, Toomas, 1966-

2014-01-01

Tallinnas Vaba Lava teatrimajas toimub 28.-30. oktoobrini festival „Teater noorele vaatajale”. ASSITEJ (Association Internationale du Theatre pour l'Enfance et la Jeunesse) Eesti keskuse juhatuse esimees Toomas Tross ja juhatuse liige Hiie Fluss arutlevad lastele suunatud teatri kvaliteedi üle

Muuseumis võitleb arst saatusega / Urmas Hännile

Index Scriptorium Estoniae

Hännile, Urmas

2010-01-01

Pärnu Uue Kunsti Muuseumis linastub Pärnu filmifestivalil auhinnatud film "Lennates ühe mootoriga", ameerika režissööri Joshua Weinsteini portreefilm Indiast pärit plastilise kirurgia spetsialistist, kes kehva tervist trotsides käib Indias lastele tasuta plastilisi operatsioone tegemas

Piret Raua raamatud Saksamaal ja iPhone´is

Index Scriptorium Estoniae

2010-01-01

Piret Raua lasteraamat "Härra Linnu lugu" ilmus saksa keeles ; Piret Raua digitaalset pildiraamatut lastele "Emma roosad asjad" on võimalik kasutada Apple´i elektroonikatoodetes iPad, iPhone ja iPod (eesti, inglise ja jaapani keeles). Esitlus toimus 24. mail Lastekirjanduse Teabekeskuses

Teel koolisüsteemi ühtsuse poole / Tõnis Lukas

Index Scriptorium Estoniae

Lukas, Tõnis, 1962-

2007-01-01

Haridusminister selgitab, kuidas pakkuda lastele senisest paremaid ja võrdsemaid võimalusi hariduse omandamiseks, kuidas toimub venekeelsete koolide üleminek eestikeelsele õppele ning teeb ettepaneku moodustada tipptasemel nn. puhas gümnaasium ning senised 63 väiksemat venekeelset gümnaasiumi liita kümmekonnaks gümnaasiumiks

Eestist

Index Scriptorium Estoniae

1999-01-01

Vanemuise kontserdimaja esimene sünnipäev täissaalidega; EMA-s esmakordselt projektinädal; Juubeliüritused Otsa-koolis; Rahvusvaheline muusikaseminar Tallinnas; Saami kultuuri päevad; Kaitseväe orkester mängib operetiks; Eesti Noorte Puhkpilliorkester tähistas 5. tegevusaastat; Kandlefestival lõppes novembris; Kohalike muusikute austamine Saaremaal; Otepää kultuurielu saab uue hoo; Venekeelse elanikkonna integreerimisest rahvakultuuri kaudu; ESL esimene suurüritus; Tamula Järvemuusikakontserdi toimumine ohus

Koolivõrgu korrastamine - hariduse võrdse kättesaadavuse eeldus / Tiina Annus

Index Scriptorium Estoniae

Annus, Tiina

2005-01-01

Soovides riigi tasakaalustatud regionaalset arengut, tuleb erilist tähelepanu pöörata väga heade õppimistingimuste tagamisele hõre- ja äärealade valdades elavatele lastele, leiab autor. Art. aluseks on haridus- ja teadusministeeriumi tellimusel Poliitikauuringute Keskuses Praxis tehtud uuringu "Üldhariduskoolide võrgu korrastamine" aruanne. Graafikud. Diagrammid

Inglise keele õppekomplekt lastele / Katrin Tariq

Index Scriptorium Estoniae

Tariq, Katrin

2001-01-01

4-10-aastaste laste inglise keele õppekomplekti kuuluvad : piltsõnastik, töövihik, sõnakaardid, plakatid, lauamäng, mänguasjad. Rets. : Müürsepp, Mare. My home, family and friends. - Tallinn : TEA Kirjastus, 2001

Laboratooriumi tänavalt, armastusega / Tiiu Suvi

Index Scriptorium Estoniae

Suvi, Tiiu

2007-01-01

Laboratooriumi tänava Ukraina Kreeka-Katoliku kiriku Tallinna koguduse Kolmkäsi Jumalaema kirikust. Sisekujundajaks ning koguduse vanemaks on ERKI mööbli- ja sisekujundajana lõpetanud Anatoli Ljutjuk. Kiriku taastamisest, laupäevastest käsitöötundidest lastele, kloostrikunstide kooli Labora ja poegade Bogdani ja Nestori tegevusest

Eesti on sündinud emaarmastusest / Lennart Meri

Index Scriptorium Estoniae

Meri, Lennart, 1929-2006

2001-01-01

Lennart Meri emadepäeva kõne, 13. mai 2001. Kodu kujundab lapse tuleviku, järelikult Eesti tuleviku. Kas Eesti suudab kodust ilmajäänud lastele pakkuda uut kodu. Ilmunud ka: Järva Teataja, 15. mai 2001, lk. 2 Meie Kodu (Toronto), 23. mai, lk. 1, pealk.. Emadepäeval

New solid laser: Ceramic laser. From ultra stable laser to ultra high output laser

International Nuclear Information System (INIS)

Ueda, Kenichi

2006-01-01

An epoch-making solid laser is developed. It is ceramic laser, polycrystal, which is produced as same as glass and shows ultra high output. Ti 3+ :Al 2 O 3 laser crystal and the CPA (chirped pulse amplification) technique realized new ultra high output lasers. Japan has developed various kinds of ceramic lasers, from 10 -2 to 67 x 10 3 w average output, since 1995. These ceramic lasers were studied by gravitational radiation astronomy. The scattering coefficient of ceramic laser is smaller than single crystals. The new fast ignition method is proposed by Institute of Laser Engineering of Osaka University, Japan. Ultra-intense short pulse laser can inject the required energy to the high-density imploded core plasma within the core disassembling time. Ti 3+ :Al 2 O 3 crystal for laser, ceramic YAG of large caliber for 100 kW, transparent laser ceramic from nano-crystals, crystal grain and boundary layer between grains, the scattering coefficient of single crystal and ceramic, and the derived release cross section of Yb:YAG ceramic are described. (S.Y.)

1. XII kell 13 avatakse Pärnu uue kunsti muuseumis...

Index Scriptorium Estoniae

2002-01-01

Jõulunäitus "Kunst kuulub lastele!" kunstnike ja laste töödest. 6.-8. XII tekstiilipäevad (Anu Raud, Hilja Kulles); 13.-15. XII piparkoogipäevad; 20.-21. XII inglipäevad (kutsutud Ilon Wikland); 27-29. XII unenäopäevad (Enn Tegova). Saab vaadata Lasse Naukarise filmi "Kunstniku elu"

Ukiyo-e Adamson-Ericus

Index Scriptorium Estoniae

2003-01-01

Näitus "300 aastat jaapani puulõike traditsiooni. Ukiyo-e puulõiked meister Keizo Sato töökojast". Esitletakse faksiimiletõmmiseid Hokusai, Hiroshige, Utamaru, Sharaku jt. kunstnike töödest. Näituse koostasid Keizo Sato (sünd. 1940) ja Tuula Moilanen. 14.-16. VII Jaapani-teemaline kunstilaager 8-12aastastele lastele

Turvalise maailma võti peitub hariduses / David Bloom, Joel E. Gohen

Index Scriptorium Estoniae

Bloom, David

2005-01-01

Paljud vaesed riigid on veel kaugel eesmärgist tagada 2015. aastaks kõigile lastele üldine algharidus. Autorid annavad ülevaate, kui suuri kulutusi oleks vaja teha alghariduse ja põhihariduse võimaldamiseks, kuid nad nendivad, et hariduse omandamist võib mõnedes regioonides takistada ka kultuuribarjäärid. Lisa: Koolita lapsed

Näidendi esimene lugemine

Index Scriptorium Estoniae

2007-01-01

20. dets. tuleb Eesti Draamateatri maalisaalis esimesele lugemisele Mart Aasa näidend "Café Utopia. Täielik tragöödia". Loevad EMTA lavakunstikooli XXIII lennu näitlejad, lavastajana juhendab Lauri Lagle

Eesti reklaamfilm Ameerikas esimene

Index Scriptorium Estoniae

1999-01-01

Andrus Tuisu reklaamiklipp "Vigur krõps - kirik" võitis reklaamfilmide festivalil "The Mobius Advertising Awards 1998" Chicagos esimese koha : Idee autor reklaamiagentuur Kontuur Leo Burnett : Stuudio Manfred Tuisk

Esimene neljandik / Ela Tomson

Index Scriptorium Estoniae

Tomson, Ela, 1945-

2004-01-01

Ilmunud ka: Põhjarannik, 15. apr. 2004, lk. 2; Severnoje Poberezhje, 15. apr. 2004, lk. 2; Koit, 15. apr. 2004, lk. 6; Hiiumaa, 16. apr. 2004, lk. 2; Meie Maa, 16. apr. 2004, lk. 2; Võrumaa Teataja, 17. apr. 2004, lk. 2; Valgamaalane, 17. apr. 2004, lk. 2; Pärnu Postimees, 20. apr. 2004, lk. 15; Hiiu Leht, 20. apr. 2004, lk. 2. Ülevaade Riigikogu töö esimesest neljandikust, olulisematest saavutustest: vanemapalga kehtestamine ja lastetoetuse kahekordistamine, pensionitõus

Laser-diode pumped Nd:YAG lasers; Laser diode reiki Nd:YAG lasear

Energy Technology Data Exchange (ETDEWEB)

Yuasa, H.; Akiyama, Y.; Nakayama, M. [Toshiba Corp., Tokyo (Japan)

2000-04-01

Laser-diode pumped Nd:YAG lasers are expected to be applied to laser processing fields such as welding, cutting, drilling, and marking due to their potential for high efficiency and compactness. We are designing and developing laser-diode pumped Nd:YAG lasers using numerical analysis simulation techniques such as ray tracing and thermal analysis. We have succeeded in achieving a laser power of more than 3 kW with 20% efficiency, which is the best ever obtained. In addition, we have developed a laser-diode pumped green laser by second harmonic generation, for precision machining on silicon wafers. (author)

Elu on väärt riskideski / Juta Üts

Index Scriptorium Estoniae

Üts, Juta, 1934-

2004-01-01

Tallinna Noorte Naiste ja Noorte Meeste Kristlik Ühing aitab läbi projektide "Terve Eesti laps" ja "Elu on väärt ka riskides" õpetada astma- ja suhkruhaigetele lastele toimetulekut oma haigusega. Projekte tutvustavad Tallinna NNKÜ ja NMKÜ peasekretär Katrin Ohno, Tallinna Kesklinna Lastepolikliiniku päevastatsionaari töötaja Viive Sirge ning endokrinoloog dr. Riina Shor

Lasers '89

International Nuclear Information System (INIS)

Harris, D.G.; Shay, T.M.

1990-01-01

This book covers the following topics: XUV, X-Ray and Gamma-Ray Lasers, excimer lasers, chemical lasers, nuclear pumped lasers, high power gas lasers, solid state lasers, laser spectroscopy. The paper presented include: Development of KrF lasers for fusion and Nuclear driven solid-state lasers

Laser safety at high profile laser facilities

International Nuclear Information System (INIS)

Barat, K.

2010-01-01

Complete text of publication follows. Laser safety has been an active concern of laser users since the invention of the laser. Formal standards were developed in the early 1970's and still continue to be developed and refined. The goal of these standards is to give users guidance on the use of laser and consistent safety guidance and requirements for laser manufacturers. Laser safety in the typical research setting (government laboratory or university) is the greatest challenge to the laser user and laser safety officer. This is due to two factors. First, the very nature of research can put the user at risk; consider active manipulation of laser optics and beam paths, and user work with energized systems. Second, a laser safety culture that seems to accept laser injuries as part of the graduate student educational process. The fact is, laser safety at research settings, laboratories and universities still has long way to go. Major laser facilities have taken a more rigid and serious view of laser safety, its controls and procedures. Part of the rationale for this is that these facilities draw users from all around the world presenting the facility with a work force of users coming from a wide mix of laser safety cultures. Another factor is funding sources do not like bad publicity which can come from laser accidents and a poor safety record. The fact is that injuries, equipment damage and lost staff time slow down progress. Hence high profile/large laser projects need to adapt a higher safety regimen both from an engineering and administrative point of view. This presentation will discuss all these points and present examples. Acknowledgement. This work has been supported by the University of California, Director, Office of Science.

Laser in urology. Laser i urologien

Energy Technology Data Exchange (ETDEWEB)

Breisland, H.O. (Aker Sykehus, Oslo (Norway))

1991-09-01

The neodymium YAG laser is particularly suited for endoscopic urologic surgery because the YAG laser light can be conducted in flexible fibers. Superficial bladder tumours can be treated under local anaesthesia in the outpatient department. The frequency of local recurrences is low, significantly lower than after electrosection or electrocoagulation. Selected cases of T2-muscle invasive bladder tumours can be cured with laser coagulation applied subsequently to transurethral resection. Combined treatment with electrosection and laser coagulation of localized prostatic cancer is a promising method which compares favourably with results obtained by other treatment modalities. Tumours in the upper urinary tract can be laser-treated through ureteroscopes or nephroscopes, but the treatment should be limited to low stage, low grade tumours. Laser is the treatment of choice for intraurethral condylomatas. Laser treatment of penil carcinoma gives excellent cosmetic and functional results and few local recurrences. Laser lithotripsy is a new technique for treatment of ureteric stones and photodynamic laser therapy is a promising tecnique for treatment of carcinoma in situ in the bladder empithelium. However, neither of these techniques are available for clinical use in Norway as yet. 17 refs., 3 figs., 1 tabs.

ATHENA pakub lastele filmitegemisvõimalusi / Kairit Pihlak

Index Scriptorium Estoniae

Pihlak, Kairit, 1969-

2002-01-01

Rakveres 4.-10. märtsil toimuvad laste filmipäevad koostöös Tantsu- ja kunstikooliga "Athena" ja OÜ MultiFilmiga (kinobuss), kavast. Samas ka sügisel 2002 koolis loodavast video- ja filmiosakonnast

Lastedisain ehk kodumaine disainerlooming lastele / Dagmar Reinolt

Index Scriptorium Estoniae

Reinolt, Dagmar

2015-01-01

Eesti disainerite poolt toodetud lastepärased esemed - võileivaalus (VarmCountry), tapeet "Värvi ise" (Anni Varm), söögitool "Mari" (Julia Maria Künnap), nööpsadul (Liisa Elken), öökullipadi (Ann Lutter), kiikhobu "Fox" (Maile Grünberg), KuKuJuKu helkurid (Okeiko) ja Dadamora lasteriided (Mariliis Oksaar,Tõnis Kenkmaa)

Hea teater lastele ja noortele / Katrin Ruus

Index Scriptorium Estoniae

Ruus, Katrin

2006-01-01

22.-27. maini Tallinnas, Tartus, Pärnus, Narvas toimunud laste- ja noortetatrite festivalist "Draamake 2006". Nimetatud auhinnasaajad : lastelavastuse auhinna sai Vanemuise "Suur kuri hunt" (lavastaja Taago Tubin), noorsooteatri auhind määrati Vene Teatri lavastusele "Veerevad kivid ei sammaldu" (lavastaja Nikita Grinshpun), näitlejaauhinnaga pärjati Marika Vaarikut osatäitmise eest VAT Teatri lavastuses "Klammi sõda", publikupuudutuse auhinna sai ZUGA ühendatud tantsijate "ZUGA lastekas" ja sõnajõuauhind läks NO99 teatri lavastusele "Kaks päikest" (lavastaja Andres Noormets)

Plekktrummeldajate lastel on Stasi legendid / Andres Laasik

Index Scriptorium Estoniae

Laasik, Andres, 1960-2016

2000-01-01

50. Berliini filmifestivalil linastunud saksa režissööri Volker Schlöndorffi mängufilmist "Rita legendid" ja Tom Cruiseþi osatäitmisest Paul Thomas Andersoni filmis "Magnolia" : Ameerika Ühendriigid

Laser system using ultra-short laser pulses

Science.gov (United States)

Dantus, Marcos [Okemos, MI; Lozovoy, Vadim V [Okemos, MI; Comstock, Matthew [Milford, MI

2009-10-27

A laser system using ultrashort laser pulses is provided. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and binary pulse shaping (BPS). Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and a SHG crystal.

Application of Various Lasers to Laser Trimming Resistance System

Institute of Scientific and Technical Information of China (English)

SUN Ji-feng

2007-01-01

Though the laser trimming resistance has been an old laser machining industry for over 30 years, the development of technology brings new alternative lasers which can be used for the traditional machining. The paper describes application of various lasers to laser trimming resistance system including early traditional krypton arc lamp pumped Nd:YAG to laser, modern popular diode pumped solid state laser and the present advanced harmonic diode pumped solid state laser. Using the new alternative lasers in the laser trimming resistance system can dramatically improve the yields and equipment performance.

40 aastat vanglat arvutivõhikluse eest / Elver Loho

Index Scriptorium Estoniae

Loho, Elver

2007-01-01

USA-s Connecticuti osariigis Norwichi linna Kelly Põhikoolis juhtus 2004. aastal sündmus, mille tagajärjel mõisteti õpetaja Julie Amero süüdi maksimaalse karistusajaga 40 aastat. Õpetaja oli väljunud korraks klassist ja võimaldanud lastel klikata tema arviti lingile, mis käivitas pahatahtliku programmi pornograafiliste piltidega, mida võhiklik õpetaja ei osanud tagasi tulles kohe sulgeda

Eestist

Index Scriptorium Estoniae

1999-01-01

Vabariigi aastapäeva tähistamisest Põlvamaal, intervjuu Miliza Korjuse tütrega, Anne Veski on Venemaal endiselt populaarne, kuhu panna laulma J. Carreras, lätlased domineerisid Valga klaveriansamblite festivalil, Rein Rannapi kontserdi järelkajad Järvamaal ja Virumaal, Viruma orkestritest,Avo Tamme laulud, mitmest huvitavast muusikust maakondades, Saaremaa folkloristide ettevõtmistest ja rahvapilliõpetusest lastele Viljandis, kitarristidest-muuikutest ja Viljandi kontseriuudiseid

Geopolititsheskii kozõr / Oleg Morozov ; interv. Ilja Nikiforov

Index Scriptorium Estoniae

Morozov, Oleg

2006-01-01

Venemaa Riigiduuma esimene asespiiker Oleg Morozov järgmisest võimalikust presidendist, valitsuse moodustamisest, Riigiduuma osast riigi demokraatlikus arengus, Venemaast globaalses energiapoliitikas

Laser optically pumped by laser-produced plasma

International Nuclear Information System (INIS)

Silfvast, W.T.; Wood, O.R. II.

1975-01-01

Laser solids, liquids and gases are pumped by a new technique in which the output from an efficient molecular laser, such as a CO 2 laser, ionizes a medium, such as xenon, into a generally cylindrical plasma volume, in proximity to the pumped laser body. Breakdown yields a visible and ultraviolet-radiation-emitting plasma in that volume to pump the laser body. The spectral radiance of the plasma is significantly higher than that produced by a dc-discharge-heated plasma at nearly all wavelengths in the plasma spectrum. The risetime of radiation from the laser-produced plasma can also be significantly shorter than that of a dc heated plasma. A further advantage resides in the fact that in some applications the attenuating walls needed by flashlamps may be eliminated with the result that laser threshold is more readily reached. Traveling wave excitation may be provided by oblique incidence of the pumping laser beam through the ionizable medium to create sequential ionization of portions of that medium along the length of the pumped laser body. (auth)

Diode laser-pumped Ho:YLF laser

International Nuclear Information System (INIS)

Hemmati, H.

1987-01-01

The author reports laser action in Ho:YLF at 2.06 μm following optical pumping with a cw diode laser array. Diode laser-pumped Nd-YAG and Ho:YAG have been reported recently. Lasers with a wavelength of 2 μm have medical and optical communication applications. The diode laser light is focused with a 60-mm focal length lens onto the YLF crystal. A high-reflectivity mirror with 100-mm radius of curvature was used as the output coupler. The lasing threshold was at 5 mWof incident power. This is higher than expected considering that a high reflector was used as the output coupler. However, a more uniform cooling of the crystal is expected to lower the lasing threshold. With 100 mW of pump power coupled into the crystal, --20 mW of 2-μm radiation was observed from this unoptimized setup. The 2-μm laser output is highly sensitive to output coupler alignment, YLF crystal temperature, and pump laser wavelength. The 20% optical conversion efficiency achieved in his preliminary measurements is expected to be improved by better crystal cooling, proper matching of laser wavelength to crystal absorption, variations in the concentration of Ho and sensitizers and use of a proper output coupler. A study of the parameters mentioned above and the effect of crystal temperature on the laser output is under way

Lasers for the SILVA laser isotope separation process

International Nuclear Information System (INIS)

Lapierre, Y.

1997-01-01

The main principles of the laser isotope separation process for the production of enriched uranium at lower cost, are reviewed and the corresponding optimal laser characteristics are described. The development of the SILVA laser isotope separation process involved researches in the various domains of pump lasers, dye lasers, laser and optics systems and two test facilities for the feasibility studies which are expected for 1997

Development of frequency tunable Ti:sapphire laser and dye laser pumped by a pulsed Nd:YAG laser

International Nuclear Information System (INIS)

Yi, Jong Hoon; Horn, Roland; Wendt, K.

2001-01-01

We investigated lasing characteristics of two kinds of tunable laser, liquid dye laser and solid Ti:sapphire crystal laser, pumped by high pulse repetition rate Nd:YAG laser. Dye laser showed drastically reduced pulsewidth compared with that of pump laser and it also contained large amount of amplified spontaneous emission. Ti:sapphire laser showed also reduced pulsewidth. But, the laser conversion pump laser and Ti:sapphire laser pulse, we used a Brewster-cut Pockel's cell for Q-switching. The laser was frequency doubled by a type I BBO crystal outside of the cavity.

Photonic bandgap fiber lasers and multicore fiber lasers for next generation high power lasers

DEFF Research Database (Denmark)

Shirakawa, A.; Chen, M.; Suzuki, Y.

2014-01-01

Photonic bandgap fiber lasers are realizing new laser spectra and nonlinearity mitigation that a conventional fiber laser cannot. Multicore fiber lasers are a promising tool for power scaling by coherent beam combination. © 2014 OSA....

Laser power sources and laser technology for accelerators

International Nuclear Information System (INIS)

Lowenthal, D.

1986-01-01

The requirements on laser power sources for advanced accelerator concepts are formidable. These requirements are driven by the need to deliver 5 TeV particles at luminosities of 10/sup 33/ - 10/sup 34/ cm/sup -2/ sec/sup -1/. Given that optical power can be transferred efficiently to the particles these accelerator parameters translate into single pulse laser output energies of several kilojoules and rep rates of 1-10 kHz. The average laser output power is then 10-20 MW. Larger average powers will be needed if efficient transfer proves not to be possible. A laser plant of this magnitude underscores the importance of high wall plug efficiency and reasonable cost in $/Watt. The interface between the laser output pulse format and the accelerator structure is another area that drives the laser requirements. Laser accelerators break up into two general architectures depending on the strength of the laser coupling. For strong coupling mechanisms, the architecture requires many ''small'' lasers powering the accelerator in a staged arrangement. For the weak coupling mechanisms, the architecture must feature a single large laser system whose power must be transported along the entire accelerator length. Both of these arrangements have demanding optical constraints in terms of phase matching sequential stages, beam combining arrays of laser outputs and optimizing coupling of laser power in a single accelerating stage

TLÜ esimeses rahvusvahelises magistriprogrammis õpivad oma eriala professionaalid : magistriõpe / Krista Männa

Index Scriptorium Estoniae

Männa, Krista

2005-01-01

16.-20. novembril toimus Tallinna Ülikooli esimese rahvusvahelise magistriõppekava "European Perspectives on Social Inclusion" (eesti keeles "Sotsiaalse kaasamise Euroopa perspektiivid") esimene õppesessioon

Laser pumped lasers for isotope separation

International Nuclear Information System (INIS)

Fry, S.M.

1976-01-01

A study of the isotope separation laser requirements reveals that high pressure polyatomic molecular gas laser pumped lasers can attain the necessary characteristics including tunability, energy output, pulse width, and repetition rate. The results of a search, made for molecules meeting the appropriate requirements for one of several pump schemes utilizing a CO 2 laser and with output in the 12 μm or 16μm wavelength range, are presented. Several methods of pumping are reviewed and two novel pump schemes are presented. A laser pumped laser device design is given, and operation of this device and associated diagnostic equipment is confirmed by repeating experiments in OCS and NH 3 . The results of OCS laser experiments show that an improvement in pump rate and output per unit length is obtained with the device, using a wedged transverse pumping scheme. A new multi-line laser system in NH 3 pumped by a TEA CO 2 laser is reported. More than forty transitions spanning the wavelength range of 9.2 to 13.8 μm are observed and identified. A strong output at 12.08 μm is one of the closest lines yet found to the required laser isotope separation wavelength. Far infrared emission near 65 μm is observed and is responsible for populating levels which lase in pure ammonia near 12.3 μm. Buffer gas (e.g., N 2 or He) pressures of approximately 40--800 torr cause energy transfer by collision-induced rotationaltransitions from the pumped antisymmetric to the lasing symmetric levels in the nu 2 = 1 band of ammonia. Most of the observed lines are aP(J,K) transitions which originate from the nu 2 /sup s/ band. Measurements of the pressure dependence of the laser output shows that some lines lase at pressures greater than one atmosphere. Transient behavior of the 12.08 μm line is calculated from a simplified analytic model and these calculations are compared to the experimental results

Future prospects of laser diodes and fiber lasers

International Nuclear Information System (INIS)

Ueda, Ken-ichi

2000-01-01

For the next century we should develop new concepts for coherent control of light generation and propagation. Owing to the recent development of ultra fine structures in semiconductor lasers, fiber lasers, and various kinds of waveguide structure, we can make optical devices which control the light propagation artificially. But, the phase locking and phase control of multiple laser oscillators are one of the most important directions of laser science and technology. The coherent summation has been a dream of laser since 1960. Is it possible to solve this old and quite challenging problem for laser science? This is also a very basic concept because the laser action based on the stimulated emission is the process of coherent summation of huge number of photons emitted from individual atoms. In this paper, I discuss the fundamental direction of laser research in the next ten or twenty years. The active optics and laser technology should be combined intrinsically in near future. (author)

YCOB lasers

International Nuclear Information System (INIS)

Richardson, Martin; Hammons, Dennis; Eichenholz, Jason; Chai, Bruce; Ye, Qing; Jang, Won; Shah, Lawrence

1999-01-01

We review new developments with a new laser host material, YCa 4 O(BO 3 ) 3 or YCOB. Lasers based on this host material will open new opportunities for the development of compact, high-power, frequency-agile visible and near IR laser sources, as well as sources for ultrashort pulses. Efficient diode-pumped laser action with both Nd-doped and Yb-doped YCOB has already been demonstrated. Moreover, since these materials are biaxial, and have high nonlinear optical coefficients, they have become the first laser materials available as efficient self-frequency-doubled lasers, capable of providing tunable laser emission in several regions of the visible spectrum. Self-frequency doubling eliminates the need for inclusion of a nonlinear optical element within or external to the laser resonator. These laser materials possess excellent thermal and optical properties, have high laser-damage thresholds, and can be grown to large sizes. In addition they are non-hygroscopic. They therefore possess all the characteristics necessary for laser materials required in rugged, compact systems. Here we summarize the rapid progress made in the development of this new class of lasers, and review their potential for a number of applications. (author)

Parameters in fractional laser assisted delivery of topical anesthetics: Role of laser type and laser settings.

Science.gov (United States)

Meesters, Arne A; Nieboer, Marilin J; Kezic, Sanja; de Rie, Menno A; Wolkerstorfer, Albert

2018-05-07

Efficacy of topical anesthetics can be enhanced by pretreatment of the skin with ablative fractional lasers. However, little is known about the role of parameters such as laser modality and laser density settings in this technique. Aims of this study were to compare the efficacy of pretreatment with two different ablative fractional laser modalities, a CO 2 laser and an Er:YAG laser, and to assess the role of laser density in ablative fractional laser assisted topical anesthesia. In each of 15 healthy subjects, four 10 × 10 mm test regions on the back were randomized to pretreatment (70-75 μm ablation depth) with CO 2 laser at 5% density, CO 2 laser at 15% density, Er:YAG laser at 5% density or Er:YAG laser at 15% density. Articaine hydrochloride 40 mg/ml + epinephrine 10 μg/ml solution was applied under occlusion to all four test regions. After 15 minutes, a pass with the CO 2 laser (1,500 μm ablation depth) was administered as pain stimulus to each test region. A reference pain stimulus was given on unanesthetized skin. The main outcome parameter, pain, was scored on a 0-10 visual analogue scale (VAS) after each pain stimulus. Median VAS scores were 1.50 [CO 2 5%], 0.50 [CO 2 15%], 1.50 [Er:YAG 5%], 0.43 [Er:YAG 15%], and 4.50 [unanesthetized reference]. VAS scores for all pretreated test regions were significantly lower compared to the untreated reference region (P laser pretreated regions. However, VAS scores were significantly lower at 15% density compared to 5% density for both for the CO 2 laser (P laser (P laser was considered slightly more painful than pretreatment with Er:YAG laser by the subjects. Fractional laser assisted topical anesthesia is effective even with very low energy settings and an occlusion time of only 15 minutes. Both the CO 2 laser and the Er:YAG laser can be used to assist topical anesthesia although the CO 2 laser pretreatment is experienced as more painful. In our study settings, using articaine

Laser beam cutting method. Laser ko ni yoru kaitai koho

Energy Technology Data Exchange (ETDEWEB)

Kutsumizu, A. (Obayashi Corp., Osaka (Japan))

1991-07-01

In this special issue paper concerning the demolition of concrete structures, was introduced a demolition of concrete structures using laser, of which practical application is expected due to the remarkable progress of generating power and efficiency of laser radiator. The characteristics of laser beam which can give a temperature of one million centigrade at the irradiated spot, the laser radiator consisting of laser medium, laser resonator and pumping apparatus, and the laser kinds for working, such as CO{sub 2} laser, YAG laser and CO laser, were described. The basic constitution of laser cutting equipment consisting of large generating power radiator, beam transmitter, beam condenser, and nozzle for working was also illustrated. Furthermore, strong and weak points in the laser cutting for concrete and reinforcement were enumerated. Applications of laser to cutting of reinforced and unreinforced concrete constructions were shown, and the concept and safety measure for application of laser to practical demolition was discussed. 5 refs., 8 figs.

Ultrashort pulse laser technology laser sources and applications

CERN Document Server

Schrempel, Frank; Dausinger, Friedrich

2016-01-01

Ultrashort laser pulses with durations in the femtosecond range up to a few picoseconds provide a unique method for precise materials processing or medical applications. Paired with the recent developments in ultrashort pulse lasers, this technology is finding its way into various application fields. The book gives a comprehensive overview of the principles and applications of ultrashort pulse lasers, especially applied to medicine and production technology. Recent advances in laser technology are discussed in detail. This covers the development of reliable and cheap low power laser sources as well as high average power ultrashort pulse lasers for large scale manufacturing. The fundamentals of laser-matter-interaction as well as processing strategies and the required system technology are discussed for these laser sources with respect to precise materials processing. Finally, different applications within medicine, measurement technology or materials processing are highlighted.

Vse teatrõ v gosti k nam / Irina Butjajeva

Index Scriptorium Estoniae

Butjajeva, Irina

2005-01-01

25.-27. märtsini toimub Vene Kultuurikeskuses esimene rahvusvaheline festival "Baltiiski bereg" (Balti kallas). Tutvustatakse festivalil osalevaid lasteteatreid. Ürituse organisaatoriks on Teater Grotesk

Päevad : [luuletused] / Philip Larkin ; inglise keelest tlk. Maarja Kangro

Index Scriptorium Estoniae

Larkin, Philip

2007-01-01

Sisu: Päevad ; Mitte midagi öelda ; See olgu värss ; Uurimus lugemisharjumustest ; Hommage valitsusele ; Vesi ; Vajakud ; Viige üks koju lastele ; Jutt voodis ; Kõrged aknad ; Sa jätkad elu ; Kui. Orig.: Days ; Nothing to be said ; This be the verse ; A study of reading habits ; Homage to a government ; Water ; Wants ; Take one home for the kiddies ; Talking in bed ; High windows ; Continuing to live ; If

Peeter Kreitzberg : võtame vaestelt lapsed ära! / Peeter Kreitzberg ; interv. Helen Urbanik

Index Scriptorium Estoniae

Kreitzberg, Peeter, 1948-2011

2001-01-01

Endine haridusminister tuli märtsi keskel konverentsil "Teine võimalus hariduses" välja ettepanekuga, et lastele peaks koolis käimine olema kohustuslik 18. eluaastani, riigi pansionidesse ja internaatidesse tuleks panna need lapsed, kelle pered ei jaksa neid üleval pidada. Autori täiendus 3. mai Eesti Ekspressi kirjade rubriigis (lk. A6) pealkirja all: Pakkusin vanematele võimalust, mitte vaeste laste konfiskeerimist. Autor: Keskerakond. Parlamendisaadik

Laser beam diagnostics for kilowatt power pulsed YAG laser

International Nuclear Information System (INIS)

Liu, Yi; Leong, Keng H.

1992-01-01

There is a growing need for high power YAG laser beam diagnostics with the recent introduction of such lasers in laser material processing. In this paper, we will describe the use of a commercially available laser beam analyzer (Prometec) to profile the laser beam from a 1600 W pulsed Nd:YAG laser that has a 1 mm fiber optic beam delivery system. The selection of laser pulse frequency and pulse width for the measurement is discussed. Laser beam propagation parameters by various optical components such as fibers and lenses can be determined from measurements using this device. The importance of such measurements will be discussed

Laser materials processing with diode lasers

OpenAIRE

Li, Lin; Lawrence, Jonathan; Spencer, Julian T.

1996-01-01

Laser materials processing is currently dominated by CO2, Nd-YAG and Excimer lasers. Continuous advances in semiconductor laser technology over the last decade have increased the average power output of the devices annualy by two fold, resulting in the commercial availability of the diode lasers today with delivery output powers in excess of 60W in CW mode and 5kW in qasi-CW mode. The advantages of compactness, high reliability, high efficiency and potential low cost, due to the mass producti...

Transurethral vaporesection of prostate: diode laser or thulium laser?

Science.gov (United States)

Tan, Xinji; Zhang, Xiaobo; Li, Dongjie; Chen, Xiong; Dai, Yuanqing; Gu, Jie; Chen, Mingquan; Hu, Sheng; Bai, Yao; Ning, Yu

2018-05-01

This study compared the safety and effectiveness of the diode laser and thulium laser during prostate transurethral vaporesection for treating benign prostate hyperplasia (BPH). We retrospectively analyzed 205 patients with BPH who underwent a diode laser or thulium laser technique for prostate transurethral vaporesection from June 2016 to June 2017 and who were followed up for 3 months. Baseline characteristics of the patients, perioperative data, postoperative outcomes, and complications were compared. We also assessed the International Prostate Symptom Score (IPSS), quality of life (QoL), maximum flow rate (Q max ), average flow rate (AFR), and postvoid residual volume (PVR) at 1 and 3 months postoperatively to evaluate the functional improvement of each group. There were no significant differences between the diode laser and thulium laser groups related to age, prostate volume, operative time, postoperative hospital stays, hospitalization costs, or perioperative data. The catheterization time was 3.5 ± 0.8 days for the diode laser group and 4.7 ± 1.8 days for the thulium laser group (p diode laser and thulium laser contributes to safe, effective transurethral vaporesection in patients with symptomatic BPH. Diode laser, however, is better than thulium laser for prostate transurethral vaporesection because of its shorter catheterization time. The choice of surgical approach is more important than the choice of laser types during clinical decision making for transurethral laser prostatectomy.

Iz zolushki - v modeli / Olga Grigorjeva

Index Scriptorium Estoniae

Grigorjeva, Olga, 1983-

2007-01-01

Esimene rahvusvaheline laste ja noorte moeteatrite festival "Max Moda 2007" Tallinnas. Festivali peakorraldajast, moeteatrist Max Moda. Asutaja ja kunstiline juht on Maksim Hlebnikov. Kommenteerib Tatjana Hlebnikova

Paabeli torn / Andri Maimets

Index Scriptorium Estoniae

Maimets, Andri, 1979-

2007-01-01

Europarlamendi esimene filmipreemia Lux, mille materiaalseks ekvivalendiks on Paabeli torni kujutav kujuke ning filmi subtitreerimine 23 Euroopa keelde (lisaks üks koopia kurtidele). Sellise preemia otstarbekusest

Vavilonskaja bashnja / Andri Maimets

Index Scriptorium Estoniae

Maimets, Andri, 1979-

2007-01-01

Europarlamendi esimene filmipreemia Lux, mille materiaalseks ekvivalendiks on Paabeli torni kujutav kujuke ning filmi subtitreerimine 23 Euroopa keelde (lisaks üks koopia kurtidele). Sellise preemia otstarbekusest

Reverse spontaneous laser line sweeping in ytterbium fiber laser

Czech Academy of Sciences Publication Activity Database

Navrátil, Petr; Peterka, Pavel; Honzátko, Pavel; Kubeček, V.

2017-01-01

Roč. 14, č. 3 (2017), č. článku 035102. ISSN 1612-2011 R&D Projects: GA ČR(CZ) GA16-13306S Institutional support: RVO:67985882 ; RVO:68378271 Keywords : laser line sweeping * ytterbium * fiber lasers Subject RIV: BH - Optics, Masers, Lasers; BH - Optics, Masers, Lasers (FZU-D) OBOR OECD: Optics (including laser optics and quantum optics); Optics (including laser optics and quantum optics) (FZU-D) Impact factor: 2.537, year: 2016

High-energy molecular lasers self-controlled volume-discharge lasers and applications

CERN Document Server

Apollonov, V V

2016-01-01

This book displays the physics and design of high-power molecular lasers. The lasers described are self-controlled volume-discharge lasers. The book explains self-sustained discharge lasers, self-initiated discharge lasers and technical approaches to laser design. Important topics discussed are laser efficiency, laser beam quality and electric field homogeneity. The book contains many new innovative applications.

Tudengid alustavad ametit klassikaga / Margus Haav

Index Scriptorium Estoniae

Haav, Margus, 1969-

2010-01-01

30. jaanuaril esietendub TÜ Viljandi Kultuuriakadeemia lavakunstide osakonna 8. lennu ehk Von Krahli kursuse esimene diplomitöö, "Kuningas Lear", lavastaja Peeter Jalakas. Von Krahli kursuse nimekiri

Plaadid / Priit Hõbemägi

Index Scriptorium Estoniae

Hõbemägi, Priit, 1957-

2006-01-01

Uutest heliplaatidest Bruce Springsteen "We Shall Overcome", Langoth "Grounding", Tool "10000 Days", Pet Shop Boys "Fundamental", "Wicked Jazz Sounds 2", Terminaator "Nagu esimene kord", Jamie Foxx "Unpredictable"

Algirdas Brazauskas : Ma ei häbene rahvale oma liini näidata / Algirdas Brazauskas ; interv. Sirje Pärismaa

Index Scriptorium Estoniae

Brazauskas, Algirdas, 1932-2010

2001-01-01

Taasiseseisvunud Leedu esimene president oma ametiaja suurimatest saavutustest, oma edu saladusest, muutustest Leedu ühiskonnas, Balti riikide ühtsusest, Leedu-Vene suhetest, kokkupuudetest Eestiga jm. Eluloolisi andmeid

Pikaajaline investor huvitub eelkõige äripinna renditulust / Tanel Veisson

Index Scriptorium Estoniae

Veisson, Tanel

2006-01-01

Ilmunud ka: Delovõje Vedomosti : Nedvizhimost 13. sept. lk. 15. Äripindade investeeringult teenitav tulu jaguneb kaheks: tegevustulu ja kapitalitulu. Pikaajalisi investoreid huvitab esimene, spekulante seevastu viimane

Laser safety considerations for a mobile laser program

Science.gov (United States)

Flor, Mary

1997-05-01

An increased demand for advanced laser technology, especially in the area of cutaneous and cosmetic procedures has prompted physicians to use mobile laser services. Utilization of a mobile laser service allows physicians to provide the latest treatments for their patients while minimizing overhead costs. The high capital expense of laser systems is often beyond the financial means of individual clinicians, group practices, free-standing clinics and smaller community hospitals. Historically rapid technology turnover with laser technology places additional risk which is unacceptable to many institutions. In addition, health care reform is mandating consolidation of equipment within health care groups to keep costs at a minimum. In 1994, Abbott Northwestern Hospital organized an in-house mobile laser technology service which employs a group of experienced laser specialists to deliver and support laser treatments for hospital outreach and other regional physicians and health care facilities. Many of the hospital's internal safety standards and policies are applicable to the mobile environment. A significant challenge is client compliance because of the delicate balance of managing risk while avoiding being viewed as a regulator. The clinics and hospitals are assessed prior to service to assure minimum laser safety standards for both the patient and the staff. A major component in assessing new sites is to inform them of applicable regulatory standards and their obligations to assure optimum laser safety. In service training is provided and hospital and procedures are freely shared to assist the client in establishing a safe laser environment. Physician and nursing preceptor programs are also made available.

Dermatological laser treatment

International Nuclear Information System (INIS)

Moerk, N.J.; Austad, J.; Helland, S.; Thune, P.; Volden, G.; Falk, E.

1991-01-01

The article reviews the different lasers used in dermatology. Special emphasis is placed on the treatment of naevus flammeus (''portwine stain'') where lasers are the treatment of choice. Argon laser and pulsed dye laser are the main lasers used in vascular skin diseases, and the article focuses on these two types. Copper-vapour laser, neodymium-YAG laser and CO 2 laser are also presented. Information is provided about the availability of laser technology in the different health regions in Norway. 5 refs., 2 figs

Laser Ablation of Biological Tissue Using Pulsed CO2 Laser

International Nuclear Information System (INIS)

Hashishin, Yuichi; Sano, Shu; Nakayama, Takeyoshi

2010-01-01

Laser scalpels are currently used as a form of laser treatment. However, their ablation mechanism has not been clarified because laser excision of biological tissue occurs over a short time scale. Biological tissue ablation generates sound (laser-induced sound). This study seeks to clarify the ablation mechanism. The state of the gelatin ablation was determined using a high-speed video camera and the power reduction of a He-Ne laser beam. The aim of this study was to clarify the laser ablation mechanism by observing laser excision using the high-speed video camera and monitoring the power reduction of the He-Ne laser beam. We simulated laser excision of a biological tissue by irradiating gelatin (10 wt%) with radiation from a pulsed CO 2 laser (wavelength: 10.6 μm; pulse width: 80 ns). In addition, a microphone was used to measure the laser-induced sound. The first pulse caused ablation particles to be emitted in all directions; these particles were subsequently damped so that they formed a mushroom cloud. Furthermore, water was initially evaporated by laser irradiation and then tissue was ejected.

Laser applications in nanotechnology: nanofabrication using laser ablation and laser nanolithography

International Nuclear Information System (INIS)

Makarov, G N

2013-01-01

The fact that nanoparticles and nanomaterials have fundamental properties different both from their constituent atoms or molecules and from their bulk counterparts has stimulated great interest, both theoretical and practical, in nanoparticles and nanoparticle-based assemblies (functional materials), with the result that these structures have become the subject of explosive research over the last twenty years or so. A great deal of progress in this field has relied on the use of lasers. In this paper, the directions followed and results obtained in laser nanotechnology research are reviewed. The parameters, properties, and applications of nanoparticles are discussed, along with the physical and chemical methods for their fabrication and investigation. Nanofabrication applications of and fundamental physical principles behind laser ablation and laser nanolithography are discussed in detail. The applications of laser radiation are shown to range from fabricating, melting, and evaporating nanoparticles to changing their shape, structure, size, and size distribution, through studying their dynamics and forming them into periodic arrays and various structures and assemblies. The historical development of research on nanoparticles and nanomaterials and the application of laser nanotechnology in various fields are briefly reviewed. (reviews of topical problems)

Laser spectroscopy and laser isotope separation of atomic gadolinium

International Nuclear Information System (INIS)

Chen, Y. W.; Yamanaka, C.; Nomaru, K.; Kou, K.; Niki, H.; Izawa, Y.; Nakai, S.

1994-01-01

Atomic vapor laser isotope separation (AVLIS) is a process which uses intense pulsed lasers to selectively photoionize one isotopic species of a chemical element, after which these ions are extracted electromagnetically. The AVLIS has several advantages over the traditional methods based on the mass difference, such as high selectivity, low energy consumption, short starting time and versatility to any atoms. The efforts for atomic vapor laser isotope separation at ILT and ILE, Osaka University have been concentrated into the following items: 1) studies on laser spectroscopy and laser isotope separation of atomic gadolinium, 2) studies on interaction processes including coherent dynamics, propagation effects and atom-ion collision in AVLIS system, 3) development of laser systems for AVLIS. In this paper, we present experimental results on the laser spectroscopy and laser isotope separation of atomic gadolinium.

The Newest Laser Processing

International Nuclear Information System (INIS)

Lee, Baek Yeon

2007-01-01

This book mentions laser processing with laser principle, laser history, laser beam property, laser kinds, foundation of laser processing such as laser oscillation, characteristic of laser processing, laser for processing and its characteristic, processing of laser hole including conception of processing of laser hole and each material, and hole processing of metal material, cut of laser, reality of cut, laser welding, laser surface hardening, application case of special processing and safety measurement of laser.

Esimene foto Tallinnast? / Tõnis Liibek

Index Scriptorium Estoniae

Liibek, Tõnis

2007-01-01

Kõigi eelduste kohaselt võiks vanim Tallinna kujutav foto pärineda ajavahemikust 1845-55. Suure tõenäosusega võib vanim Tallinna foto asuda Saksamaal, olles ümberasujate poolt kaasa võetud. Teadaolevalt vanim Tallinna fotojäädvustus pärineb 1850. aastate lõpust, reservatsioonidega võiks see olla Tallinna Linnamuuseumis säilitatav ülesvõte Toompeale viivast äsja valminud Falgi teest. Tallinnas tegutsenud esimestest fotograafidest.

Esimene avalik filmiseanss / Jaak Lõhmus

Index Scriptorium Estoniae

Lõhmus, Jaak

2007-01-01

Thomas Alva Edisoni kinetoskoobi patendi omandamise ebaseseaduslikkusest : Gordon Hendricks oma raamatus "Edisoni filmimüüt" tõestavat, et autorlus pidanuks kuuluma William Kennedy Laurie Dicksonile (1860-1935)

"Berlinale" esimene poolaeg / Endel Link

Index Scriptorium Estoniae

Link, Endel

2004-01-01

Berliini filmifestivali mängufilme - "Tunnistaja" ("Svjedoci") : režissöör Vinko Breshan : Horvaatia, "Country of My Skull" : režissöör John Boorman : Suurbritannia, "Koletis" ("Monster") : režissöör Patty Jenkins : Ameerika Ühendriigid, "Kadunud" ("The Missing") : režissöör Ron Howard : Ameerika Ühendriigid, "Mida süda soovib" ("Something's Gotta Give") : režissöör Nancy Meyer ja "Ilus maa" ("Beautiful Country") : režissöör Hans Petter Moland : Ameerika Ühendriigid - Norra

Electrodeless excimer laser; Laser a eccimeri senza elettrodi

Energy Technology Data Exchange (ETDEWEB)

Lisi, N. [ENEA, Divisione Nuovi Materiali, Centro Ricerche Casaccia, Rome (Italy)

2001-07-01

In this paper it is proposed how to build an excimer laser based on an electrodeless discharge (or Dielectric Barrier Discharge). Such laser could operate with a low energy per pulse (<100 mJ) and a high repetition rate (<100 kHz). The most relevant advantage an electrodeless DBD laser is the much longer gas mixture lifetime. This feature could allow the operation of a sealed laser emitting higher average power with respect to commercially available excimer lasers. Such discharge scheme could be advantageous in order to excite the F{sub 2} excimer molecule, whose emission wavelength in the VUV range (157 nm) at high reprate is particularly interesting in the micro-lithography field. [Italian] In questo documento viene proposto come costruire un laser a eccimeri basato su una scarica priva di elettrodi, o Dielectric Barrier Discharge. Tale laser puo' funzionare con una bassa energia per impulso (<100 mJ) ad alta frequenza di ripetizione (<100 kHz). Il vantaggio fondamentale di un laser a DBD e quindi privo di elettrodi e' la vita media della miscela gassosa molto piu' alta che potrebbe permettere alla camera laser di operare sigillata ad una potenza media superiore a quella dei laser a eccimeri attuali. Tale schema di pompaggio potrebbe essere particolarmente vantaggioso per eccitare la molecola eccimero F{sub 2} la cui lunghezza di emissione nel VUV (157 nm) ad elevata frequenza di ripetizione presenta un notevole interesse nel campo della produzione di microcircuiti.

Laser technologies for laser accelerators. Annual report

International Nuclear Information System (INIS)

1985-01-01

The primary result of the work reported is the determination of laser system architectures that satsify the requirements of high luminosity, high energy (about 1 TeV), electron accelerators. It has been found that high laser efficiency is a very hard driver for these accelerators as the total average laser output optical power is likely to fall above 10 MW. The luminosity requires rep rates in the kHz range, and individual pulse lengths in the 1-10 psec range are required to satisfy acceleration gradient goals. CO 2 and KrF lasers were chosen for study because of their potential to simultaneously satisfy the given requirements. Accelerator luminosity is reviewed, and requirements on laser system average power and rep rate are determined as a function of electron beam bunch parameters. Laser technologies are reviewed, including CO 2 , excimers, solid state, and free electron lasers. The proposed accelerator mechanisms are summarized briefly. Work on optical transport geometries for near and far field accelerators are presented. Possible exploitation of the CO 2 and DrF laser technology to generate the required pulse lengths, rep rates, and projected efficiencies is illustrated and needed development work is suggested. Initial efforts at developing a 50 GeV benchmark conceptual design and a 100 MeV demonstration experiment conceptual design are presented

Laser ion sources

Energy Technology Data Exchange (ETDEWEB)

Bykovskij, Yu

1979-02-01

The characteristics a laser source of multiply-ionized ions are described with regard to the interaction of laser radiation and matter, ion energy spectrum, angular ion distribution. The amount of multiple-ionization ions is evaluated. Out of laser source applications a laser injector of multiple-ionization ions and nuclei, laser mass spectrometry, laser X-ray microradiography, and a laser neutron generators are described.

SEB Panga kliendikeskkond = SEB Bank customer environment

Index Scriptorium Estoniae

2011-01-01

Tallinnas Kristiine keskuses asuva SEB pangakontori sisekujundusest. Autorid: Eero Jürgenson, Andres Jomp, Rene Safin (ARS Projekt), loetletud nende tehtud töid. SEB uue disainikontseptsiooni esimene rakendus

Uus tähendus naistepäevale / Marianne Skardéus, Urve Läänemets

Index Scriptorium Estoniae

Skardéus, Marianne

2008-01-01

Rahvusvahelisest naistest haridustöötajate organisatsioonist: Delta Kappa Gamma maailmaorganisatsioon (Delta Kappa Gamma Society International). 8. märtsil avati Tallinna Rahvusraamatukogus selle organisatsiooni esimene Eesti allorganisatsioon.

Nussbaumile muuseum Osnabrückis

Index Scriptorium Estoniae

1998-01-01

Saksamaal avatud juudi maalikunstniku Felix Nussbaumi (1904-1944) muuseumi projekteeris USA arhitekt Daniel Liebeskind. Esimene välisnäitus - Art Spiegelmani Miki-Hiire koomiksiraamatute väljapanek

Laser Physics and Physics with Lasers - Recent Advances

International Nuclear Information System (INIS)

Marowsky, G.

2008-01-01

This contribution reviews the development as well as recent technological advances in the field of optics with lasers and laser-related applications. Topics ranging from 'attoscience' to 'zero-modes' shall be dealt with in this presentation. Further reading in the following references is suggested: Springer Handbook of Lasers and Optics (F. Trager, ed.), 2007, ISBN-13: 978-0-387-95579-7; Chapter 11.7, Part C: Ultraviolet Lasers: Excimers, Fluorine (F2), Nitrogen (N2), pp. 764-776; Excimer Laser Technology (D. Basting, G. Marowsky, eds.) 2005, Springer, ISBN-13 978-3-540-20056-7

LASER PROCESSING ON SINGLE CRYSTALS BY UV PULSE LASER

OpenAIRE

龍見, 雅美; 佐々木, 徹; 高山, 恭宜

2009-01-01

Laser processing by using UV pulsed laser was carried out on single crystal such as sapphire and diamond in order to understand the fundamental laser processing on single crystal. The absorption edges of diamond and sapphire are longer and shorter than the wave length of UV laser, respectively. The processed regions by laser with near threshold power of processing show quite different state in each crystal.

Design windows of laser fusion power plants and conceptual design of laser-diode pumped slab laser

International Nuclear Information System (INIS)

Kozaki, Y.; Eguchi, T.; Izawa, Y.

1999-01-01

An analysis of the design space available to laser fusion power plants has been carried out, in terms of design key parameters such as target gain, laser energy and laser repetition rate, the number of fusion react ion chambers, and plant size. The design windows of economically attractive laser fusion plants is identified with the constraints of key design parameters and the cost conditions. Especially, for achieving high repetition rate lasers, we have proposed and designed a diode-pumped solid-state laser driver which consists of water-cooled zig-zag path slab amplifiers. (author)

Lasers

CERN Document Server

Milonni, Peter W

1988-01-01

A comprehensive introduction to the operating principles and applications of lasers. Explains basic principles, including the necessary elements of classical and quantum physics. Provides concise discussions of various laser types including gas, solid state, semiconductor, and free electron lasers, as well as of laser resonators, diffraction, optical coherence, and many applications including holography, phase conjugation, wave mixing, and nonlinear optics. Incorporates many intuitive explanations and practical examples. Discussions are self-contained in a consistent notation and in a style that should appeal to physicists, chemists, optical scientists and engineers.

Development of laser materials processing and laser metrology techniques

International Nuclear Information System (INIS)

Kim, Cheol Jung; Chung, Chin Man; Kim, Jeong Mook; Kim, Min Suk; Kim, Kwang Suk; Baik, Sung Hoon; Kim, Seong Ouk; Park, Seung Kyu

1997-09-01

The applications of remote laser materials processing and metrology have been investigated in nuclear industry from the beginning of laser invention because they can reduce the risks of workers in the hostile environment by remote operation. The objective of this project is the development of laser material processing and metrology techniques for repairing and inspection to improve the safety of nuclear power plants. As to repairing, we developed our own laser sleeve welding head and innovative optical laser weld monitoring techniques to control the sleeve welding process. Furthermore, we designed and fabricated a 800 W Nd:YAG and a 150 W Excimer laser systems for high power laser materials processing in nuclear industry such as cladding and decontamination. As to inspection, we developed an ESPI and a laser triangulation 3-D profile measurement system for defect detection which can complement ECT and UT inspections. We also developed a scanning laser vibrometer for remote vibration measurement of large structures and tested its performance. (author). 58 refs., 16 tabs., 137 figs

Development of short pulse laser pumped x-ray lasers

International Nuclear Information System (INIS)

Dunn, J; Osterheld, A L; Hunter, J R; Shlyaptsev, V N

2000-01-01

X-ray lasers have been extensively studied around the world since the first laboratory demonstration on the Novette laser at LLNL in 1984 [l]. The characteristic properties of short wavelength, high monochromaticity, collimation and coherence make x-ray lasers useful for various applications. These include demonstrations of biological imaging within the water window, interferometry of laser plasmas and radiography of laser-heated surfaces. One of the critical issues has been the high power pump required to produce the inversion. The power scaling as a function of x-ray laser wavelength follows a -k4 to law. The shortest x-ray laser wavelength of ∼ 35 (angstrom) demonstrated for Ni-like All was at the limit of Nova laser capabilities. By requiring large, high power lasers such as Nova, the shot rate and total number of shots available have limited the rapid development of x-ray lasers and applications. In fact over the last fifteen years the main thrust has been to develop more efficient, higher repetition rate x-ray lasers that can be readily scaled to shorter wavelengths. The recent state of progress in the field can be found in references. The objective of the project was to develop a soft x-ray laser (XRL) pumped by a short pulse laser of a few joules. In effect to demonstrate a robust, worlung tabletop x-ray laser at LLNL for the first time. The transient collisional scheme as proposed by Shlyaptsev et al [8, 9] was the candidate x-ray laser for study. The successful endeavour of any scientific investigation is often based upon prudent early decisions and the choice of this scheme was both sound and fruitful. It had been demonstrated very recently for Ne-like Ti at 326 A using a small tabletop laser [10] but had not yet reached its full potential. We chose this scheme for several reasons: (a) it was a collisional-type x-ray laser which has been historically the most robust; (b) it had the promise of high efficiency and low energy threshold for lasing; (c) the

Laser-supported detonation waves and pulsed laser propulsion

International Nuclear Information System (INIS)

Kare, J.

1990-01-01

A laser thermal rocket uses the energy of a large remote laser, possibly ground-based, to heat an inert propellant and generate thrust. Use of a pulsed laser allows the design of extremely simple thrusters with very high performance compared to chemical rockets. The temperatures, pressures, and fluxes involved in such thrusters (10 4 K, 10 2 atmospheres, 10 7 w/cm 2 ) typically result in the creation of laser-supported detonation (LSD) waves. The thrust cycle thus involves a complex set of transient shock phenomena, including laser-surface interactions in the ignition of the LSD wave, laser-plasma interactions in the LSD wave itself, and high-temperature nonequilibrium chemistry behind the LSD wave. The SDIO Laser Propulsion Program is investigating these phenomena as part of an overall effort to develop the technology for a low-cost Earth-to-orbit laser launch system. We will summarize the Program's approach to developing a high performance thruster, the double-pulse planar thruster, and present an overview of some results obtained to date, along with a discussion of the many research question still outstanding in this area

ND:GLASS LASER DESIGN FOR LASER ICF FISSION ENERGY (LIFE)

International Nuclear Information System (INIS)

Caird, J.A.; Agrawal, V.; Bayramian, A.; Beach, R.; Britten, J.; Chen, D.; Cross, R.; Ebbers, C.; Erlandson, A.; Feit, M.; Freitas, B.; Ghosh, C.; Haefner, C.; Homoelle, D.; Ladran, T.; Latkowski, J.; Molander, W.; Murray, J.; Rubenchik, S.; Schaffers, K.; Siders, C.W.; Stappaerts, E.; Sutton, S.; Telford, S.; Trenholme, J.; Barty, C.J.

2008-01-01

We have developed preliminary conceptual laser system designs for the Laser ICF (Inertial Confinement Fusion) Fission Energy (LIFE) application. Our approach leverages experience in high-energy Nd:glass laser technology developed for the National Ignition Facility (NIF), along with high-energy-class diode-pumped solid-state laser (HEC-DPSSL) technology developed for the DOE's High Average Power Laser (HAPL) Program and embodied in LLNL's Mercury laser system. We present laser system designs suitable for both indirect-drive, hot spot ignition and indirect-drive, fast ignition targets. Main amplifiers for both systems use laser-diode-pumped Nd:glass slabs oriented at Brewster's angle, as in NIF, but the slabs are much thinner to allow for cooling by high-velocity helium gas as in the Mercury laser system. We also describe a plan to mass-produce pump-diode lasers to bring diode costs down to the order of $0.01 per Watt of peak output power, as needed to make the LIFE application economically attractive

Parem linn ja parem elu Shanghais / Lylian Meister

Index Scriptorium Estoniae

Meister, Lylian, 1966-

2010-01-01

Eesti Kunstiakadeemia disainiteaduskond esitles 20 üliõpilase töid näitusel "Young Creators for Better City & Better Life" Shanghais Tongji ülikoolis 7.09.-8.10.2010 (kuraator Sixten Heidmets). Näitus toimus rahvusvahelise kunsti-, disaini- ja arhitektuurikõrgkoolide assotsiatsiooni CUMULUS 20. aastapäeva konverentsi raames. Konkursil pälvis jagatud 3. koha tekstiilidisainer Liis Koort magistritööga "Taktiilne tekstiil. Teraapiavahend tunnetushäiretega lastele". CUMULUSe konverentsist

Venemaa süüdistab Soomet venelaste ahistamises / Tommi Nieminen

Index Scriptorium Estoniae

Nieminen, Tommi

2008-01-01

ÜRO-s Soome inimõigusraporti ettekande järel tõstatas Venemaa küsimuse saamide ja venelaste olukorra ning lastele ja naistele suunatud perevägivalla kohta Soomes. Autori sõnul on inimõigused ja demokraatia Venemaa jaoks uus relv poliitilises vastulöögis Lääne-Euroopale ja USA-le. Soome välisministeeriumi kantsleri Teija Tiilikaineni, välispoliitika instituudi spetsialisti Hiski Haukkala, parlamendiliikme Heidi Hautala seisukohti

Laser fusion

International Nuclear Information System (INIS)

Eliezer, S.

1982-02-01

In this paper, the physics of laser fusion is described on an elementary level. The irradiated matter consists of a dense inner core surrounded by a less dense plasma corona. The laser radiation is mainly absorbed in the outer periphery of the plasma. The absorbed energy is transported inward to the ablation surface where plasma flow is created. Due to this plasma flow, a sequence of inward going shock waves and heat waves are created, resulting in the compression and heating of the core to high density and temperature. The interaction physics between laser and matter leading to thermonuclear burn is summarized by the following sequence of events: Laser absorption → Energy transport → Compression → Nuclear Fusion. This scenario is shown in particular for a Nd:laser with a wavelength of 1 μm. The wavelength scaling of the physical processes is also discussed. In addition to the laser-plasma physics, the Nd high power pulsed laser is described. We give a very brief description of the oscillator, the amplifiers, the spatial filters, the isolators and the diagnostics involved. Last, but not least, the concept of reactors for laser fusion and the necessary laser system are discussed. (author)

New power lasers

International Nuclear Information System (INIS)

Yamanaka, Masanobu; Daido, Hiroyuki; Imasaki, Kazuo.

1989-01-01

As the new power lasers which are expected to exert large extending effect to the fields of advanced science and technology including precision engineering as well as laser nuclear fusion, LD-excited solid laser, X-ray laser and free electron laser are taken up and outlined. Recently, the solid laser using high power output, high efficiency semiconductor laser as the exciting beam source has been developed. This is called laser diode (LD)-excited solid laser, and the heightening of power output and efficiency and the extension of life are planned. Its present status and application to medical use, laser machining, laser soldering and so on are described. In 1960, the laser in visible region appeared, however in 1985, the result of observing induced emission beam by electron collision exciting method was reported in USA. In the wavelength range of 200 A, holography and contact X-ray microscope applications were verified. The various types of soft X-ray laser and the perspective hereafter are shown. The principle of free electron laser is explained. In the free electron laser, wavelength can be changed by varying electron beam energy, the period of wiggler magnetic field and the intensity of magnetic field. Further, high efficiency and large power output are possible. Its present status, application and the perspective hereafter are reported. (K.I.)

An application of the theory of laser to nitrogen laser pumped dye laser

International Nuclear Information System (INIS)

Osman, Fatima Ahmed

1998-03-01

In this thesis we gave a general discussion on lasers, reviewing some of their properties, types and application. We also conducted an experiment where we obtained a dye laser pumped by nitrogen laser with a wave length of 337.1 nm and a power of 5 Mw.It was noticed that the produced radiation possesses characteristics different from those of other types of laser. This characteristics determine the tunability i.e the possibility of choosing the appropriately required wave-length of radiation for various applications.(Author)

Virumaal elab hiphopkultuur rampidel ja tänavatel / Britta aka BB

Index Scriptorium Estoniae

Britta aka BB

2008-01-01

Rakvere JJ-Street on esimene ametlik tänavatantsukool Eestis. 26.-28. septembril toimub Tallinnas Salme kultuurikeskuses tänavatantsufestival JJ-Street Baltic Session, festivali korraldaja on Joel Juht

Moeteater ühendab mitmest rahvusest Tallinna lapsi / Merike Teder

Index Scriptorium Estoniae

Teder, Merike

2005-01-01

Tallinnas Suur-Ameerika noortekeskuses avatud moeteatri Max Moda tegevusest. Rajaja ja tegevjuht Maksim Hlebnikov, kunstiline juht Margit Leerimaa. Moeteatri esimene etendus toimub 11. märtsil Rahvusraamatukogu suures konverentsisaalis

Sisustust Viru tänavalt / Piret Veigel

Index Scriptorium Estoniae

Veigel, Piret, 1961-

2003-01-01

Tallinnas Viru t. avatud uues sisustussalongis Rest Art pakutavast. Kaupluse esimene osa on pühendatud elutoale, tagumine ruum on sisustatud magamistoana. Pakutavad kodutekstiilid on kujundanud Külli Salum

Tallinna Pedagoogikaülikooli oluline samm Euroopa teadusmaailma / Lauri Suurmaa

Index Scriptorium Estoniae

Suurmaa, Lauri

2004-01-01

Prof. Raimo Pullat viibis Püha Maria Vabas Ülikoolis, kus toimus ülikoolidevahelise keskuse - International Interuniversity Centre for the Mediterranean, Central-Eastern Europe and Eurasia esimene üldassamblee

Kak sdelat iz slona voronu / Margarita Golovanova

Index Scriptorium Estoniae

Golovanova, Margarita

2006-01-01

25 aastat tagasi valmis NSV Liidus esimene plastiliinist nukkudega animafilm "Plastiliinist vares" ("Plastilinovaja vorona") : režissöör Aleksandr Tatarski : kunstnik-lavastaja Igor Kovaljov : helilooja Grigori Gladkov

Täna õhtul algab ETVs "Bionina" sari / Meelis Burget

Index Scriptorium Estoniae

Burget, Meelis

2006-01-01

Tartu Ülikooli teadlaste osalusel valminud telesarja "Bionina" esimene saade räägib kogu sarjale nime andnud seadeldisest. Kolloid- ja keskkonnakeemia vanemteadur Toonika Rinken tutvustab esimeses saates biosensorit

Кто такая Каролина Ивановна? (текстологический анализ петербургской поэмы Ф. Достоевского "Двойник" и рассказа Я. Буткова "Первое число")

Index Scriptorium Estoniae

Котельникова, Татьяна

2004-01-01

F. Dostojevski "Teisiku" Karoliina Ivanovna tegelaskujus ja J. Butkovi jutustuse "Kuu esimene päev" samanimelises tegelaskujus võib näha viidet N. Gogoli jutustuse "Sinel" lavatagusele tegelaskujule

Lahti uus Sibelius-talo

Index Scriptorium Estoniae

2000-01-01

Lahtis avati esimene puulipikuist ehitatud kontserdimaja, mis sai Sibeliuse nime. Arhitektid Hannu Tikka, Kimmo Lintula. Sibelius-talo hea akustika tagamiseks osales firma Artec New Yorgist eesotsas akustik Russell Johnsoniga.

Voronezhi kunstivarade kataloog sai valmis / Siim Randla

Index Scriptorium Estoniae

Randla, Siim, 1972-

2006-01-01

Ilmub esimene osa Inge Kuke koostatud kataloogist "Dorpat-Jurjev-Tartu ja Voronež: ülikooli kollektsiooni saatus", kus tutvustatakse TÜ kunstivarade kollektsiooni, mis Esimese maailmasõja ajal Voronezhisse viidi

Laser propulsion for orbit transfer - Laser technology issues

Science.gov (United States)

Horvath, J. C.; Frisbee, R. H.

1985-01-01

Using reasonable near-term mission traffic models (1991-2000 being the assumed operational time of the system) and the most current unclassified laser and laser thruster information available, it was found that space-based laser propulsion orbit transfer vehicles (OTVs) can outperform the aerobraked chemical OTV over a 10-year life-cycle. The conservative traffic models used resulted in an optimum laser power of about 1 MW per laser. This is significantly lower than the power levels considered in other studies. Trip time was taken into account only to the extent that the system was sized to accomplish the mission schedule.

Efficiencies of laser dyes for atomic vapor laser isotope separation

International Nuclear Information System (INIS)

Maeda, Mitsuo; Oki, Yuji; Uchiumi, Michihiro; Takao, Takayuki; Igarashi, Kaoru; Shimamoto, Kojiro.

1995-01-01

Efficiencies of 30 laser dyes for the atomic vapor laser isotope separation (AVLIS) are experimentally evaluated with a dye laser pumped by a frequency-doubled Nd:YAG laser. On the other hand, a simulation code is developed to describe the laser action of Rhodamine 6G, and the dependence of the laser efficiency on the pump wavelength is calculated. Following conclusions are obtained by these considerations:space: 1) Pyrromethene 567 showed 16% higher laser efficiency than Rhodamine 6G by 532 nm pumping, and Pyrromethene 556 has an ability to provide better efficiency by green light pumping with a Cu vapor laser; 2) Kiton red 620 and Rhodamine 640, whose efficiencies were almost the same as Rhodamine 6G by 532 nm pumping, will show better efficiencies by two-wavelength pumping with a Cu vapor laser. (author)

Laser frequency modulator for modulating a laser cavity

Science.gov (United States)

Erbert, Gaylen V.

1992-01-01

The present invention relates to a laser frequency modulator for modulating a laser cavity. It is known in the prior art to utilize a PZT (piezoelectric transducer) element in combination with a mirror to change the cavity length of a laser cavity (which changes the laser frequency). Using a PZT element to drive the mirror directly is adequate at frequencies below 10 kHz. However, in high frequency applications (100 kHz and higher) PZT elements alone do not provide a sufficient change in the cavity length. The present invention utilizes an ultrasonic concentrator with a PZT element and mirror to provide modulation of the laser cavity. With an ultrasonic concentrator, the mirror element at the end of a laser cavity can move at larger amplitudes and higher frequencies.

Laser Technology.

Science.gov (United States)

Gauger, Robert

1993-01-01

Describes lasers and indicates that learning about laser technology and creating laser technology activities are among the teacher enhancement processes needed to strengthen technology education. (JOW)

ND:GLASS LASER DESIGN FOR LASER ICF FISSION ENERGY (LIFE)

Energy Technology Data Exchange (ETDEWEB)

Caird, J A; Agrawal, V; Bayramian, A; Beach, R; Britten, J; Chen, D; Cross, R; Ebbers, C; Erlandson, A; Feit, M; Freitas, B; Ghosh, C; Haefner, C; Homoelle, D; Ladran, T; Latkowski, J; Molander, W; Murray, J; Rubenchik, S; Schaffers, K; Siders, C W; Stappaerts, E; Sutton, S; Telford, S; Trenholme, J; Barty, C J

2008-10-28

We have developed preliminary conceptual laser system designs for the Laser ICF (Inertial Confinement Fusion) Fission Energy (LIFE) application. Our approach leverages experience in high-energy Nd:glass laser technology developed for the National Ignition Facility (NIF), along with high-energy-class diode-pumped solid-state laser (HEC-DPSSL) technology developed for the DOE's High Average Power Laser (HAPL) Program and embodied in LLNL's Mercury laser system. We present laser system designs suitable for both indirect-drive, hot spot ignition and indirect-drive, fast ignition targets. Main amplifiers for both systems use laser-diode-pumped Nd:glass slabs oriented at Brewster's angle, as in NIF, but the slabs are much thinner to allow for cooling by high-velocity helium gas as in the Mercury laser system. We also describe a plan to mass-produce pump-diode lasers to bring diode costs down to the order of $0.01 per Watt of peak output power, as needed to make the LIFE application economically attractive.

The influence of laser-particle interaction in laser induced breakdown spectroscopy and laser ablation inductively coupled plasma spectrometry

International Nuclear Information System (INIS)

Lindner, Helmut; Loper, Kristofer H.; Hahn, David W.; Niemax, Kay

2011-01-01

Particles produced by previous laser shots may have significant influence on the analytical signal in laser-induced breakdown spectroscopy (LIBS) and laser ablation inductively coupled plasma (LA-ICP) spectrometry if they remain close to the position of laser sampling. The effects of these particles on the laser-induced breakdown event are demonstrated in several ways. LIBS-experiments were conducted in an ablation cell at atmospheric conditions in argon or air applying a dual-pulse arrangement with orthogonal pre-pulse, i.e., plasma breakdown in a gas generated by a focussed laser beam parallel and close to the sample surface followed by a delayed crossing laser pulse in orthogonal direction which actually ablates material from the sample and produces the LIBS plasma. The optical emission of the LIBS plasma as well as the absorption of the pre-pulse laser was measured. In the presence of particles in the focus of the pre-pulse laser, the plasma breakdown is affected and more energy of the pre-pulse laser is absorbed than without particles. As a result, the analyte line emission from the LIBS plasma of the second laser is enhanced. It is assumed that the enhancement is not only due to an increase of mass ablated by the second laser but also to better atomization and excitation conditions favored by a reduced gas density in the pre-pulse plasma. Higher laser pulse frequencies increase the probability of particle-laser interaction and, therefore, reduce the shot-to-shot line intensity variation as compared to lower particle loadings in the cell. Additional experiments using an aerosol chamber were performed to further quantify the laser absorption by the plasma in dependence on time both with and without the presence of particles. The overall implication of laser-particle interactions for LIBS and LA-ICP-MS/OES are discussed.

The influence of laser-particle interaction in laser induced breakdown spectroscopy and laser ablation inductively coupled plasma spectrometry

Science.gov (United States)

Lindner, Helmut; Loper, Kristofer H.; Hahn, David W.; Niemax, Kay

2011-02-01

Particles produced by previous laser shots may have significant influence on the analytical signal in laser-induced breakdown spectroscopy (LIBS) and laser ablation inductively coupled plasma (LA-ICP) spectrometry if they remain close to the position of laser sampling. The effects of these particles on the laser-induced breakdown event are demonstrated in several ways. LIBS-experiments were conducted in an ablation cell at atmospheric conditions in argon or air applying a dual-pulse arrangement with orthogonal pre-pulse, i.e., plasma breakdown in a gas generated by a focussed laser beam parallel and close to the sample surface followed by a delayed crossing laser pulse in orthogonal direction which actually ablates material from the sample and produces the LIBS plasma. The optical emission of the LIBS plasma as well as the absorption of the pre-pulse laser was measured. In the presence of particles in the focus of the pre-pulse laser, the plasma breakdown is affected and more energy of the pre-pulse laser is absorbed than without particles. As a result, the analyte line emission from the LIBS plasma of the second laser is enhanced. It is assumed that the enhancement is not only due to an increase of mass ablated by the second laser but also to better atomization and excitation conditions favored by a reduced gas density in the pre-pulse plasma. Higher laser pulse frequencies increase the probability of particle-laser interaction and, therefore, reduce the shot-to-shot line intensity variation as compared to lower particle loadings in the cell. Additional experiments using an aerosol chamber were performed to further quantify the laser absorption by the plasma in dependence on time both with and without the presence of particles. The overall implication of laser-particle interactions for LIBS and LA-ICP-MS/OES are discussed.

Excimer Laser Technology

CERN Document Server

Basting, Dirk

2005-01-01

This comprehensive survey on Excimer Lasers investigates the current range of the technology, applications and devices of this commonly used laser source, as well as the future of new technologies, such as F2 laser technology. Additional chapters on optics, devices and laser systems complete this compact handbook. A must read for laser technology students, process application researchers, engineers or anyone interested in excimer laser technology. An effective and understandable introduction to the current and future status of excimer laser technology.

Laser systems for on-line laser ion sources

International Nuclear Information System (INIS)

Geppert, Christopher

2008-01-01

Since its initiation in the middle of the 1980s, the resonant ionization laser ion source has been established as a reliable and efficient on-line ion source for radioactive ion beams. In comparison to other on-line ion sources it comprises the advantages of high versatility for the elements to be ionized and of high selectivity and purity for the ion beam generated by resonant laser radiation. Dye laser systems have been the predominant and pioneering working horses for laser ion source applications up to recently, but the development of all-solid-state titanium:sapphire laser systems has nowadays initiated a significant evolution within this field. In this paper an overview of the ongoing developments will be given, which have contributed to the establishment of a number of new laser ion source facilities worldwide during the last five years.

Ettevalmistus noortebiennaaliks Pärnus / Heie Treier

Index Scriptorium Estoniae

Treier, Heie, 1963-

2007-01-01

Ideest korraldada 2007. aasta sügisel Tallinnas esimene noorte kunstnike biennaal, mille toimkonda juhivad Rael Artel ning Airi Triisberg. Pärnus toimunud üritusest "Public preparation. Exercises on Adhocracy"

Eesti suurim tuulepark Pakri poolsaarel / Tiit Kallaste, Enn Kareda, Anton Laur, Koidu Tenno

Index Scriptorium Estoniae

2004-01-01

Pakri tuulepark on Eesti esimene suur rahvusvaheline tuuleenergia ühisrakenduse projekt, mille tasuvusuuring ja tuulepargi esimese järgu ehitus on täielikult finantseeritud väliskapitali poolt. Tabelid

Kümne aasta tõsiseim kriis / Sirje Rank

Index Scriptorium Estoniae

Rank, Sirje, 1966-

2008-01-01

Venemaa investeerimisfirma KIT Finance pankrotiohtu sattumine käivitas paanika Vene börsil. Suurfirmade juhid ootavad valitsuselt otsustavamaid samme olukorra pidurdamiseks. Vt. samas: KIT Finance; Hannes Sarv. Esimene kukkuja

Uus punapass saab mikrokiibiga järglase / Aleksei Günter

Index Scriptorium Estoniae

Günter, Aleksei, 1979-

2005-01-01

Anti välja esimene uue kujundusega Eesti kodaniku pass, järgmisel aastal plaanib kodakondsus- ja migratsiooniamet võtta kasutusele biomeetrilise passi, mis on varustatud mikrokiibiga. Lisa: Uus pass

Äripäev hakkab välja andma PR-ajakirja

Index Scriptorium Estoniae

2012-01-01

Ilmuma hakkas Eesti esimene kommunikatsioonispetsialistidele ja -juhtidele mõeldud erialaajakiri Kaja, mille väljaandja on Äripäeva teabekirjastus koostöös Tallinna Ülikooli kommunikatsiooni instituudiga

Aasta Suurim Film? / Chili Palmer

Index Scriptorium Estoniae

Palmer, Chili

2002-01-01

Peter Jacksoni esimene film J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", ("The Lord of the Rings : The Fellowship of the Ring") : Uus-Meremaa, Ameerika Ühendriigid 2001

Uudised : Kaunas

Index Scriptorium Estoniae

2005-01-01

Baltic Multiplex Ventures, mille üheks osanikuks on BDG, avab Kaunases uue kobarkino ja meelelahutuskeskuse CINAMON. Esimene taoline keskus Eestis tuleb 2006.a. Tartusse ja teine Tallinna, uude Sakala keskusse

Histologic evaluation of laser lipolysis: pulsed 1064-nm Nd:YAG laser versus cw 980-nm diode laser.

Science.gov (United States)

Mordon, Serge; Eymard-Maurin, Anne Françoise; Wassmer, Benjamin; Ringot, Jean

2007-01-01

The use of the laser as an auxiliary tool has refined the traditional technique for lipoplasty. During laser lipolysis, the interaction between the laser and the fat produced direct cellular destruction before the suction, reduced bleeding, and promoted skin tightening. This study sought to perform a comparative histologic evaluation of laser lipolysis with the pulsed 1064-nm Nd:YAG laser versus a continuous 980-nm diode laser. A pulsed 1064-nm Nd:YAG (Smart-Lipo; Deka, Italy) and a CW 980-nm diode laser (Pharaon, Osyris, France) were evaluated at different energy settings for lipolysis on the thighs of a fresh cadaver. The lasers were coupled to a 600-microm optical fiber inserted in a 1-mm diameter cannula. Biopsy specimens were taken on irradiated and non-irradiated areas. Hematoxylin-erythrosin-safran staining and immunostaining (anti-PS100 polyclonal antibody) were performed to identify fat tissue damage. In the absence of laser exposures (control specimens), cavities created by cannulation were seen; adipocytes were round in appearance and not deflated. At low energy settings, tumescent adipocytes were observed. At higher energy settings, cytoplasmic retraction, disruption of membranes, and heat-coagulated collagen fibers were noted; coagulated blood cells were also present. For the highest energy settings, carbonization of fat tissue involving fibers and membranes was clearly seen. For equivalent energy settings, 1064-nm and 980-nm wavelengths gave similar histologic results. Laser lipolysis is a relatively new technique that is still under development. Our histologic findings suggest several positive benefits of the laser, including skin retraction and a reduction in intraoperative bleeding. The interaction of the laser with the tissue is similar at 980 nm and 1064 nm with the same energy settings. Because higher volumes of fat are removed with higher total energy, a high-power 980-nm diode laser could offer an interesting alternative to the 1064-nm Nd

Tapered diode laser pumped 946 nm Nd:YAG laser

DEFF Research Database (Denmark)

Cheng, Haynes Pak Hay; Jensen, Ole Bjarlin; Petersen, Paul Michael

2009-01-01

We successfully implemented a 946 nm Nd:YAG laser based on a 808 nm tapered diode pump laser. The tapered diode is developed at the Ferdinand-Braun-Institute fur Hochstfrequenztechnik in Germany. Figure 2 shows the experimental setup and results of each pump source coupled into a 1.5 mm crystal...... laser, we show that tapered diode laser pumping potentially increase the power of 946 nm lasers by a factor of two and reduce the threshold by a factor of three....

High power lasers & systems

OpenAIRE

Chatwin, Chris; Young, Rupert; Birch, Philip

2015-01-01

Some laser history;\\ud Airborne Laser Testbed & Chemical Oxygen Iodine Laser (COIL);\\ud Laser modes and beam propagation;\\ud Fibre lasers and applications;\\ud US Navy Laser system – NRL 33kW fibre laser;\\ud Lockheed Martin 30kW fibre laser;\\ud Conclusions

Eesti Ekspressi singel 1. Eesti Ekspressi singel 2

Index Scriptorium Estoniae

2008-01-01

Kaheksa nädala jooksul ilmub koos Eesti Ekspressiga ajalehekioskitesse üks Eesti artisti singelplaat, esimene neist on Tõnis Mägi ja Noorkuu "Pühendus" (ilmub 23. okt. lehe vahel, a-capella esituses). Koos 30. okt. Ekspressiga ilmub tänavuse Superstaari konkurssi võitja Jana Kase esimene singel, rock-lugu "Leaving You For Me" (loonud Rootsis tegutsev laulukirjutajate-produtsentide tiim Tony Malm, Per Eklund, Fredrik Björk ja Martin Kesici, produtseerinud Alar Kotkas, Ilmar Laisaar, Pearu Paulus). Kõik singlid mängitakse ette Ekspressi raadiosaates "Magneet" neljapäeviti Kuku raadios algusega kell 13.00 ning kõik artistid esinevad singli ilmumispäeva õhtul telesaates "Värske Ekspress" neljapäeviti TV3-s algusega 21.30

Spectroscopic and imaging diagnostics of pulsed laser deposition laser plasmas

International Nuclear Information System (INIS)

Thareja, Raj K.

2002-01-01

An overview of laser spectroscopic techniques used in the diagnostics of laser ablated plumes used for thin film deposition is given. An emerging laser spectroscopic imaging technique for the laser ablation material processing is discussed. (author)

Laser-diode pumped 40-W Yb:YAG ceramic laser.

Science.gov (United States)

Hao, Qiang; Li, Wenxue; Pan, Haifeng; Zhang, Xiaoyi; Jiang, Benxue; Pan, Yubai; Zeng, Heping

2009-09-28

We demonstrated a high-power continuous-wave (CW) polycrystalline Yb:YAG ceramic laser pumped by fiber-pigtailed laser diode at 968 nm with 400 mum fiber core. The Yb:YAG ceramic laser performance was compared for different Yb(3+) ion concentrations in the ceramics by using a conventional end-pump laser cavity consisting of two flat mirrors with output couplers of different transmissions. A CW laser output of 40 W average power with M(2) factor of 5.8 was obtained with 5 mol% Yb concentration under 120 W incident pump power. This is to the best of our knowledge the highest output power in end-pumped bulk Yb:YAG ceramic laser.

Ceramic Laser Materials

Directory of Open Access Journals (Sweden)

Guillermo Villalobos

2012-02-01

Full Text Available Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG ceramic laser in 1995, breaking the 1 KW mark in 2002 and then the remarkable demonstration of more than 100 KW output power from a YAG ceramic laser system in 2009. Additional developments have included highly doped microchip lasers, ultrashort pulse lasers, novel materials such as sesquioxides, fluoride ceramic lasers, selenide ceramic lasers in the 2 to 3 μm region, composite ceramic lasers for better thermal management, and single crystal lasers derived from polycrystalline ceramics. This paper highlights some of these notable achievements.

Infrared laser system

International Nuclear Information System (INIS)

Cantrell, C.D.; Carbone, R.J.

1977-01-01

An infrared laser system and method for isotope separation may comprise a molecular gas laser oscillator to produce a laser beam at a first wavelength, Raman spin flip means for shifting the laser to a second wavelength, a molecular gas laser amplifier to amplify said second wavelength laser beam to high power, and optical means for directing the second wavelength, high power laser beam against a desired isotope for selective excitation thereof in a mixture with other isotopes. The optical means may include a medium which shifts the second wavelength high power laser beam to a third wavelength, high power laser beam at a wavelength coincidental with a corresponding vibrational state of said isotope and which is different from vibrational states of other isotopes in the gas mixture

Ceramic Laser Materials

Science.gov (United States)

Sanghera, Jasbinder; Kim, Woohong; Villalobos, Guillermo; Shaw, Brandon; Baker, Colin; Frantz, Jesse; Sadowski, Bryan; Aggarwal, Ishwar

2012-01-01

Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG) ceramic laser in 1995, breaking the 1 KW mark in 2002 and then the remarkable demonstration of more than 100 KW output power from a YAG ceramic laser system in 2009. Additional developments have included highly doped microchip lasers, ultrashort pulse lasers, novel materials such as sesquioxides, fluoride ceramic lasers, selenide ceramic lasers in the 2 to 3 μm region, composite ceramic lasers for better thermal management, and single crystal lasers derived from polycrystalline ceramics. This paper highlights some of these notable achievements. PMID:28817044

Laser cutting: industrial relevance, process optimization, and laser safety

Science.gov (United States)

Haferkamp, Heinz; Goede, Martin; von Busse, Alexander; Thuerk, Oliver

1998-09-01

Compared to other technological relevant laser machining processes, up to now laser cutting is the application most frequently used. With respect to the large amount of possible fields of application and the variety of different materials that can be machined, this technology has reached a stable position within the world market of material processing. Reachable machining quality for laser beam cutting is influenced by various laser and process parameters. Process integrated quality techniques have to be applied to ensure high-quality products and a cost effective use of the laser manufacturing plant. Therefore, rugged and versatile online process monitoring techniques at an affordable price would be desirable. Methods for the characterization of single plant components (e.g. laser source and optical path) have to be substituted by an omnivalent control system, capable of process data acquisition and analysis as well as the automatic adaptation of machining and laser parameters to changes in process and ambient conditions. At the Laser Zentrum Hannover eV, locally highly resolved thermographic measurements of the temperature distribution within the processing zone using cost effective measuring devices are performed. Characteristic values for cutting quality and plunge control as well as for the optimization of the surface roughness at the cutting edges can be deducted from the spatial distribution of the temperature field and the measured temperature gradients. Main influencing parameters on the temperature characteristic within the cutting zone are the laser beam intensity and pulse duration in pulse operation mode. For continuous operation mode, the temperature distribution is mainly determined by the laser output power related to the cutting velocity. With higher cutting velocities temperatures at the cutting front increase, reaching their maximum at the optimum cutting velocity. Here absorption of the incident laser radiation is drastically increased due to

Laser wakefield acceleration with high-power, few-cycle mid-IR lasers

OpenAIRE

Papp, Daniel; Wood, Jonathan C.; Gruson, Vincent; Bionta, Mina; Gruse, Jan-Niclas; Cormier, Eric; Najmudin, Zulfikar; Légaré, François; Kamperidis, Christos

2018-01-01

The study of laser wakefield electron acceleration (LWFA) using mid-IR laser drivers is a promising path for future laser driven electronaccelerators, when compared to traditional near-IR laser drivers uperating at 0.8-1 {\\mu}m central wavelength ({\\lambda}laser), as the necessary vector potential a_0 for electron injection can be achieved with smaller laser powers due to the linear dependence on {\\lambda}laser. In this work, we perform 2D PIC simulations on LWFA using few-cycle high power (5...

Laser requirements for a laser fusion energy power plant

Institute of Scientific and Technical Information of China (English)

Stephen; E.Bodner; Andrew; J.Schmitt; John; D.Sethian

2013-01-01

We will review some of the requirements for a laser that would be used with a laser fusion energy power plant, including frequency, spatial beam smoothing, bandwidth, temporal pulse shaping, efficiency, repetition rate, and reliability. The lowest risk and optimum approach uses a krypton fluoride gas laser. A diode-pumped solid-state laser is a possible contender.

Kuninganna Silvia leidis aega ka lastele / Vilja Kohler

Index Scriptorium Estoniae

Kohler, Vilja, 1966-

2007-01-01

Rootsi kuninganna Silvia pani nurgakivi rootslaste ja eestlaste sihtasutuse Eesti Agrenska Fond poolt Tartu valda Tammistu mõisasse rajatavale puuetega laste perekeskusele. Kuningannat saatis proua Evelin Ilves, kes hakkas Eesti Agrenska Fondi patrooniks. Eesti Agrenska Fond kinkis Rootsi kuningannale ja proua E. Ilvesele eritellimusel kunstnik Piret Veski valmistatud keraamilised taldrikud, mille on kujutatud armastust, truudust ning kaitset sümboliseeriv jumalaema. Proua E. Ilves pani kingitud raamatuga aluse perekeskuse raamatukogule. Juuresoleval fotol kuninganna Silvia ja proua Evelin Ilves koos Reiniku gümnaasiumi poistekooriga

"Printsess Alicia" on ooper lastelt lastele / Irina Kiviselg

Index Scriptorium Estoniae

Kiviselg, Irina, 1961-

2000-01-01

Tallinnas Vene Romansi Klubis sündis lasteooper - Boriss Kisseljovi "Printsess Alicia", mille aluseks on Charles Dickensi "Jõulumuinasjutt". Lavastaja Olga Bunder, esitavad lapsed erinevatest Tallinna koolidest. Külalisetendus Kohtla- Järve kultuurimajas

Narnia lood pakuvad naudingut just lastele / Mari Rebane

Index Scriptorium Estoniae

Rebane, Mari

2005-01-01

Walden Media tootis koos Walt Disney Pictures'iga ekraniseeringu C.S. Lewise 1950.a. ilmunud romaanist "Narnia lood : Lõvi, nõid ja riidekapp" (Chronicles of Narnia : The Lion, the Witch and the Wardrobe")

President Ilves jagas Ruila lastele aabitsaid / Karin Gustasson

Index Scriptorium Estoniae

Gustasson, Karin

2008-01-01

Kernu valla Ruila kooli 138. õppeaasta algas piduliku aktusega, kus tervituskõnega esines president Toomas Hendrik Ilves. President andis esimesse klassi astuvale 18 õpilasele isiklikult üle aabitsad pühendusega "Õpi rõõmuga!"

"Ruudi" - helge muinasjutt lastele, iroonia vanematele / Teelemari Loonet

Index Scriptorium Estoniae

Loonet, Teelemari, 1987-

2006-01-01

Lastefilm "Ruudi" : stsenaristid Aare Toikka, Aarne Mägi : režissöör Katrin Laur : nimiosas lapsnäitleja Paul Oskar Soe : operaator Rein Kotov : Allfilm - MRP Matila Röhr Productions - Schmidtz Katze Filmkollektiv 2006

Lasteaiad jäägu lastele / Hanno Pevkur

Index Scriptorium Estoniae

Pevkur, Hanno, 1977-

2006-01-01

Tallinna volikogu liige selgitab, miks temas tekitab küsitavusi linnavalitsuse kava rajada Tallinnasse 100 uut mänguväljakut. Autor leiab, et mänguväljakud saab rajada kavandatust neli korda odavamalt ning nad peaksid jääma ainult lasteaedade laste kasutada

Dokumentaalsari okupatsioonist

Index Scriptorium Estoniae

2000-01-01

Videofilm "Esimene punane aasta" Eesti ajaloost 1939-40 : Autorid Karl Kello ja Arvo Vilu : Kistler- Ritso Eesti Sihtasutus 2000. Sihtasutus teeb filme loodavale okupatsiooni muuseumile. Sihtasutuse patrooniks on president Lennart Meri

Häid oskustöölisi on ka täna võimalik koolitada / Tiina Annus

Index Scriptorium Estoniae

Annus, Tiina

2002-01-01

Kutseõppeasutustesse vastuvõtmisel ei tehta õpilaskandidaatidele kutsesobivuse teste, tulevast töökohta ei suudeta ette kujutada, esimene praktikapäev ettevõttes võib kujuneda tõeliseks šokiks

"Mina olin siin" on viimaks siin / Jaanus Noormets

Index Scriptorium Estoniae

Noormets, Jaanus

2008-01-01

Karlovy Vary filmifestivalil võistlusprogrammis "East of the West" osalenud Rene Vilbre noortefilmist "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", stsenaariumi kirjutas Ilmar Raag

Who Gets into Government? Coalition Formation in European Democracies / Holger Döring, Johan Hellström

Index Scriptorium Estoniae

Döring, Holger

2013-01-01

Valitsuste formeerumise erinev dünaamika 26 euroopa demokraatias (sealhulgas Eesti). Esimene valitsuses osalemise otsustavate tegurite süstemaatiline võrdlus ja erinevused Ida- ja Lääne-Euroopa riikide vahel

Projekt "Challenger" / Jens Schröder

Index Scriptorium Estoniae

Schröder, Jens, 1961-

2010-01-01

See oli okeanoloogia ajaloo esimene mastaapne teadusprojekt. 1872. aastal asus Briti korvett "HMS Challenger" teele kolme ja poole aastasele ekspeditsioonile ümber maakera. Teadlased uurisid võõraid rahvaid ja ookeanimaailma

Euroliidu Galileo süsteem astub kandadele USA GPS-ile / Heiki Suurkask

Index Scriptorium Estoniae

Suurkask, Heiki, 1972-

2005-01-01

Euroopa Liidu uue navigatsioonisüsteemi Galileo esimene satelliit saadeti eile kosmosesse. Satelliit GIOVE-A kujutab endast esimest ülekandemajakat, millega saab hakata looma kuni 30 satelliidist koosnevat globaalset navigatsioonivõrgustikku

Hiina naiskunstnike näitus / Maria-Kristiina Soomre

Index Scriptorium Estoniae

Soomre, Maria-Kristiina, 1978-

2001-01-01

Hongkongis avatud näitus "Hiina kunstilaval" keskendub hiina naiskunstnike Yu Cheni, Wang Jingi, Yuen Nimchi ja Hao Li loomingule ning on esimene samm võitluses hiina naiskunstnike soolise diskrimineerimise vastu.

Sidney Poitier sillutas mustanahalistele staaridele teed / Triin Tael

Index Scriptorium Estoniae

Tael, Triin

2007-01-01

20. veebr. täitub 80. eluaastat esimesel mustanahalisel filminäitlejal, kes võitis oma rolliga Oscari. Näitlejast, tema rollidest. Lisaks fakte "Esimene mustanahaline meespeaosatäitja Oscari laureaat"

Euroopa asub rajama konkurenti GPSile / Arko Olesk

Index Scriptorium Estoniae

Olesk, Arko, 1981-

2005-01-01

Euroopa Liidu uue navigatsioonisüsteemi Galileo esimene satelliit saadeti eile kosmosesse. Satelliit GIOVE-A kujutab endast esimest ülekandemajakat, millega saab hakata looma kuni 30 satelliidist koosnevat globaalset navigatsioonivõrgustikku

Animasari Bushist kolib mobiilist teleekraanile

Index Scriptorium Estoniae

2006-01-01

USA mobiilioperaator Amp'd Mobile mobiiliga filmitud ja levitatud animasari "Väike Bush : Ühendriikide kodanik" läheb teletootja Comedy Central kaudu ka telelevisse. Selles laadis on see esimene projekt

Taiwan püüab arendada suhteid Aafrika maadega / Allan Espenberg

Index Scriptorium Estoniae

Espenberg, Allan

2007-01-01

Taibeis toimus Aafrika maade ja Taiwani esimene tippkohtumine ning tööstus- ja kaubandusringkondade Taiwani-Aafrika progressiivse partnerluse foorum, põhiteemaks "Heaolu ja säästev areng". Hiina pahameel

LaserFest Celebration

Energy Technology Data Exchange (ETDEWEB)

Dr. Alan Chodos; Elizabeth A. Rogan

2011-08-25

LaserFest was the yearlong celebration, during 2010, of the 50th anniversary of the demonstration of the first working laser. The goals of LaserFest were: to highlight the impact of the laser in its manifold commercial, industrial and medical applications, and as a tool for ongoing scientific research; to use the laser as one example that illustrates, more generally, the route from scientific innovation to technological application; to use the laser as a vehicle for outreach, to stimulate interest among students and the public in aspects of physical science; to recognize and honor the pioneers who developed the laser and its many applications; to increase awareness among policymakers of the importance of R&D funding as evidenced by such technology as lasers. One way in which LaserFest sought to meet its goals was to encourage relevant activities at a local level all across the country -- and also abroad -- that would be identified with the larger purposes of the celebration and would carry the LaserFest name. Organizers were encouraged to record and advertise these events through a continually updated web-based calendar. Four projects were explicitly detailed in the proposals: 1) LaserFest on the Road; 2) Videos; 3) Educational material; and 4) Laser Days.

Development of high-power CO2 lasers and laser material processing

Science.gov (United States)

Nath, Ashish K.; Choudhary, Praveen; Kumar, Manoj; Kaul, R.

2000-02-01

Scaling laws to determine the physical dimensions of the active medium and optical resonator parameters for designing convective cooled CO2 lasers have been established. High power CW CO2 lasers upto 5 kW output power and a high repetition rate TEA CO2 laser of 500 Hz and 500 W average power incorporated with a novel scheme for uniform UV pre- ionization have been developed for material processing applications. Technical viability of laser processing of several engineering components, for example laser surface hardening of fine teeth of files, laser welding of martensitic steel shroud and titanium alloy under-strap of turbine, laser cladding of Ni super-alloy with stellite for refurbishing turbine blades were established using these lasers. Laser alloying of pre-placed SiC coating on different types of aluminum alloy, commercially pure titanium and Ti-6Al-4V alloy, and laser curing of thermosetting powder coating have been also studied. Development of these lasers and results of some of the processing studies are briefly presented here.

Laser plasma instability experiments with KrF lasers

International Nuclear Information System (INIS)

Weaver, J. L.; Karasik, M.; Serlin, V.; Obenschain, S.; Chan, L-Y.; Kehne, D.; Schmitt, A. J.; Colombant, D.; Velikovich, A.; Oh, J.; Lehmberg, R. H.; Afeyan, B.; Phillips, L.; Seely, J.; Brown, C.; Feldman, U.; Aglitskiy, Y.; Mostovych, A. N.; Holland, G.

2007-01-01

Deleterious effects of laser-plasma instability (LPI) may limit the maximum laser irradiation that can be used for inertial confinement fusion. The short wavelength (248 nm), large bandwidth, and very uniform illumination available with krypton-fluoride (KrF) lasers should increase the maximum usable intensity by suppressing LPI. The concomitant increase in ablation pressure would allow implosion of low-aspect-ratio pellets to ignition with substantial gain (>20) at much reduced laser energy. The proposed KrF-laser-based Fusion Test Facility (FTF) would exploit this strategy to achieve significant fusion power (150 MW) with a rep-rate system that has a per pulse laser energy well below 1 MJ. Measurements of LPI using the Nike KrF laser are presented at and above intensities needed for the FTF (I∼2x10 15 W/cm 2 ). The results to date indicate that LPI is indeed suppressed. With overlapped beam intensity above the planar, single beam intensity threshold for the two-plasmon decay instability, no evidence of instability was observed via measurements of (3/2)ω o and (1/2)ω o harmonic emissions

Physics of laser fusion. Volume III. High-power pulsed lasers

International Nuclear Information System (INIS)

Holzrichter, J.F.; Eimerl, D.; George, E.V.; Trenholme, J.B.; Simmons, W.W.; Hunt, J.T.

1982-09-01

High-power pulsed lasers can deliver sufficient energy on inertial-confinement fusion (ICF) time scales (0.1 to 10 ns) to heat and compress deuterium-tritium fuel to fusion-reaction conditions. Several laser systems have been examined, including Nd:glass, CO 2 , KrF, and I 2 , for their ICF applicability. A great deal of developmental effort has been applied to the Nd:glass laser and the CO 2 gas laser systems; these systems now deliver > 10 4 J and 20 x 10 12 W to ICF targets. We are constructing the Nova Nd:glass laser at LLNL to provide > 100 kJ and > 100 x 10 12 W of 1-μm radiation for fusion experimentation in the mid-1980s. For ICF target gain > 100 times the laser input, we expect that the laser driver must deliver approx. 3 to 5 MJ of energy on a time scale of 10 to 20 ns. In this paper we review the technological status of fusion-laser systems and outline approaches to constructing high-power pulsed laser drivers

Raman fiber lasers

CERN Document Server

2017-01-01

This book serves as a comprehensive, up-to-date reference about this cutting-edge laser technology and its many new and interesting developments. Various aspects and trends of Raman fiber lasers are described in detail by experts in their fields. Raman fiber lasers have progressed quickly in the past decade, and have emerged as a versatile laser technology for generating high power light sources covering a spectral range from visible to mid-infrared. The technology is already being applied in the fields of telecommunication, astronomy, cold atom physics, laser spectroscopy, environmental sensing, and laser medicine. This book covers various topics relating to Raman fiber laser research, including power scaling, cladding and diode pumping, cascade Raman shifting, single frequency operation and power amplification, mid-infrared laser generation, specialty optical fibers, and random distributed feedback Raman fiber lasers. The book will appeal to scientists, students, and technicians seeking to understand the re...

Effect of laser spot size on energy balance in laser induced plasmas

International Nuclear Information System (INIS)

Pant, H.C.; Sharma, S.; Bhawalkar, D.D.

1980-01-01

The effect of the laser spot size on laser light absorption in laser induced plasmas from solid targets was studied. It was found that at a constant laser intensity on the target, reduction in the laser spot size enhances the net laser energy absorption. It was also observed that the laser light reflection from the target becomes more diffused when the focal spot size is reduced

Influence of laser parameters on laser ultrasonic efficiency

CSIR Research Space (South Africa)

Forbes, A

2007-01-01

Full Text Available , TEA CO2 lasers, laser chemistry, short pulses 1. INTRODUCTION Polymer-matrix composites are increasingly used in the aerospace industry, particularly in the manufacture of modern fighter planes1-3. The number and complexity of such composites... efficiency can be improved by utilising short pulses in the 3–4 µm and 10 µm spectral regions1. Short pulse 10 µm radiation can be produced by transversely excited, atmospheric CO2 (TEA CO2) lasers. Due to the technological maturity of these lasers...

Uus Eesti film pandi eile Karlovy Varys projektorisse / Kristiina Davidjants

Index Scriptorium Estoniae

Davidjants, Kristiina, 1974-

2008-01-01

8. juulil esilinastus Karlovy Vary filmifestivalil Rene Vilbre noortefilm "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest". Film võistleb võistlusprogrammis "East of the West"

"Kreisiraadio" seltskond alustas heategevust

Index Scriptorium Estoniae

2007-01-01

Sihtasutus Eesti Rahvuskultuuri Fond (ERKF) ja Hannes Võrno, Tarmo Leinatamm, Peeter Oja sõlmisid lepingu, millega ERKF-i juurde moodustatakse Kreisiraadio fond. Müüki jõudis fondi rahastamiseks "Kreisiraadio" esimene duubelplaat

Kui kirjandus jäi aega kinni: sõjast ja kirjandusest Johannes Semperi loomingus / Marit Karelson

Index Scriptorium Estoniae

Karelson, Marit

2015-01-01

Artiklis keskendutakse muutustele, mida Esimene maailmasõda tõi kaasa Johannes Semperi arusaamades kirjanduse ja aja koostoimimisest ning käsitletakse kirjaniku ideed ilukirjanduse rütmist, mis on eri perioodidel erinev

Poola videokunstnik piilub kunstihoones naiste sauna / Rainer Vilumaa

Index Scriptorium Estoniae

Vilumaa, Rainer

2005-01-01

Poola meediakunstniku Katarzyna Kozyra 1997. aastast pärit ruumiinstallatsioonist "Naiste saun". See on esimene videoteos seeriast, kus kunstnik kasutab varjatud kaamerat. Näidatakse Tallinna Kunstihoones näitusel "Homo grandis natu"

The CIA shadow on the outskirts of Vilnius / Rokas M. Tracevskis

Index Scriptorium Estoniae

Tracevskis, Rokas M.

2009-01-01

Leedu võib olla esimene riik, kes tunnistab CIA vangla olemasolu oma territooriumil, kuna telekanali LNK TV andmetel tunnistasid seda mitmed ohvitserid. Poliitikutest, kes on vastanud küsimustele seoses CIA vanglaga

Lihtsas säilitusnõus on mõtted ja tunded / Vilve Torn

Index Scriptorium Estoniae

Torn, Vilve

2007-01-01

Frankfurdis toimunud sisustusmessil Ambiente 2007 sai Soome Iittala kaks Design Plusi auhinda. Esimene auhind anti agentuurile Pentagon Design teose " Jars" eest, teise auhinna sai Alfredo Häberli küünlaalus "Tris"

Etendatakse 10-aastase kirjamehe näitemäng

Index Scriptorium Estoniae

2003-01-01

Tartu katoliku kooli 3. klassi poisi Mario Raitari näitemäng "Kristoph Silvester von Tenderi lugu", mis on esimene lugu sarjast "Mario Raitari kroonika". Näidendit etendab Linnupuu Lastepereteatri trupp

Елена Руди смотрит на звезды / Ксения Репсон

Index Scriptorium Estoniae

Репсон, Ксения

2011-01-01

Kontsertfotograafi Jelena Rudi esimene personaalne fotonäitus "Three Songs No Flash" avati 10. juunil klubis Bonbon üritusega Operation Art. Peale avamist viiakse näitus kohvikusse "Spirit" (Mere pst. 6)

Елена Руди смотрит на звезды / Ксения Репсон

Index Scriptorium Estoniae

Репсон, Ксения

2011-01-01

Kontsertfotograafi Jelena Rudi esimene personaalne fotonäitus "Three Songs No Flash" avati 10. juunil klubis Bonbon. Peale avamist viiakse näitus kohvikusse "Spirit". Fotograaf räägib kontsertide pildistamisest

Kinobuss hakkas koolitama filmiõpetajaid

Index Scriptorium Estoniae

2006-01-01

9. jaan. alustas Kinobuss õpetajatele mõeldud kursusega "Teaching with animation. Õpetamine animatsiooniga", mis on esimene neljast 2006.a. toimuvast koolitusest. Töötuba peavad Mikk Rand ja Hanne Pedersen Taanist

Kinobuss hakkab õpetajaid koolitama

Index Scriptorium Estoniae

2006-01-01

9. jaan. alustas Kinobuss õpetajatele mõeldud kursusega "Teaching with animation. Õpetamine animatsiooniga", mis on esimene neljast 2006.a. toimuvast koolitusest. Töötuba peavad Mikk Rand ja Hanne Pedersen Taanist

Õuduste isanda revansh / Karlo Funk

Index Scriptorium Estoniae

Funk, Karlo, 1971-

2002-01-01

Peter Jacksoni esimene film J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse isand : Sõrmuse vennaskond" ("The Lord of the Rings : The Fellowship of the Ring") : Uus-Meremaa, Ameerika Ühendriigid 2001

Jõekaares valmis moodne korterelamu

Index Scriptorium Estoniae

2008-01-01

Austria arhitektuuribüroos Atelier Thomas Pucher & Bramberger Architects projekteeritud Tartu Jõekaare elamurajoonis valmis esimene korterelamu. Sisekujundaja Ulvi Lõhmus on loonud igale korterile omamoodi sisekujunduslahenduse ja värvikombinatsioonid. Värv. sisevaade

Eesti lülitumine modernsusesse : "Noor-Eesti" roll poliitilise ja sotsiaalse mõtte mitmekesistamisel / Toivo Raun ; tõlkinud Anne Lange

Index Scriptorium Estoniae

Raun, Toivo, 1943-

2009-01-01

Eestis juhatas modernse poliitika sisse 1905. a. revolutsioon. Revolutsiooniga ühel aastal ilmus "Noor-Eesti" esimene album. Rühmituse juhtivate teoreetikute seisukohti rahvusküsimuse, välispoliitika jt. küsimustes

Серых волков снабдят GPS-ошейниками / Мадис Филиппов

Index Scriptorium Estoniae

Филиппов, Мадис

2011-01-01

Esimene Eesti hunt sai kaela GPS-seadme, mis hakkab edastama teavet looma toitumise ja elupiirkonna kohta, lähiajal on plaanis samasuguse seadme paigaldamine veel vähemalt kolmele hundile. GPS loomadel

Vähemalt kolm hunti saavad veel GPS-kaelused / Madis Filippov

Index Scriptorium Estoniae

Filippov, Madis

2011-01-01

Esimene Eesti hunt sai kaela GPS-seadme, mis hakkab edastama teavet looma toitumise ja elupiirkonna kohta, lähiajal on plaanis samasuguse seadme paigaldamine veel vähemalt kolmele hundile. GPS loomadel

Kuninganna visiiti saadavad protestid / Inga Höglund

Index Scriptorium Estoniae

Höglund, Inga

2011-01-01

Kuninganna Elisabeth II esimene visiit Iirimaale tõi kaasa suurima julgeolekuoperatsiooni läbi aegade. Dublinis avaldas meelt Suurbritannia kuninganna visiidi vastu mitusada demonstranti. Kronoloogia: Purjus kuningas ja teised monarhide visiidid IIrimaale

Linlane arhitektuuri ja kunsti tellijana. Tallinna näide / Krista Kodres

Index Scriptorium Estoniae

Kodres, Krista, 1957-

2005-01-01

Tallinna elanikkond ja selle sotsiaalne koosseis 16.-18. sajandil. Jõukas tallinlane kui kultuuri tarbija. Muusika- ja teatriharrastused. 1710 ilmus esimene Tallinna ajaleht "Revalsche Postzeitung". Informatsioon arhitektuuri ja kunsti kohta. Bibliograafia lk. 443

Valge klaasi päevad Haapsalus / Merle Kannus

Index Scriptorium Estoniae

Kannus, Merle

2005-01-01

III rahvusvaheline kuuma klaasi sümpoosion 16.-23. VII ja näitus kuni 14. VIII Evald Okase muuseumis. Sümpoosioni kõrval korraldati 14. VII klaasimaali päev lastele, Rait Prääts avas isikunäituse "Klaasist majad" Viie Risti galeriis, bulgaarlased Lachezar Dochev ja Ventseslav Danev esinesid paarisnäitusega kultuurikeskuses, leedulane Remigius Kriukas esitas klaasist paberipresse Kuke galeriis, Erki ja Merle Kannus seadsid interaktiivse heliinstallatsiooni "Ood reisijatele" raudteejaama perroonile

Improving the laser brightness of a commercial laser system

Science.gov (United States)

Naidoo, Darryl; Litvin, Igor; Forbes, Andrew

2016-02-01

We investigate the selection of a flat-top beam and a Gaussian beam inside a laser cavity on opposing mirrors. The concept is tested external to the laser cavity in a single pass and double pass regime where the latter mimics a single round trip in the laser. We implement this intra-cavity selection through the use of two 16 level diffractive optical elements. We consider a solid-state diode side-pumped laser resonator in a typical commercial laser configuration that consists of two planar mirrors where the DOEs are positioned at the mirrors. We out couple the Gaussian and flat-top distributions and we show that we improve the brightness of the laser with active mode control. We also demonstrate that the quality of the beam transformations determine the brightness improvement.

Navigated Pattern Laser System versus Single-Spot Laser System for Postoperative 360-Degree Laser Retinopexy.

Science.gov (United States)

Kulikov, Alexei N; Maltsev, Dmitrii S; Boiko, Ernest V

2016-01-01

Purpose . To compare three 360°-laser retinopexy (LRP) approaches (using navigated pattern laser system, single-spot slit-lamp (SL) laser delivery, and single-spot indirect ophthalmoscope (IO) laser delivery) in regard to procedure duration, procedural pain score, technical difficulties, and the ability to achieve surgical goals. Material and Methods . Eighty-six rhegmatogenous retinal detachment patients (86 eyes) were included in this prospective randomized study. The mean procedural time, procedural pain score (using 4-point Verbal Rating Scale), number of laser burns, and achievement of the surgical goals were compared between three groups (pattern LRP (Navilas® laser system), 36 patients; SL-LRP, 28 patients; and IO-LRP, 22 patients). Results . In the pattern LRP group, the amount of time needed for LRP and pain level were statistically significantly lower, whereas the number of applied laser burns was higher compared to those in the SL-LRP group and in the IO-LRP group. In the pattern LRP, SL-LRP, and IO-LRP groups, surgical goals were fully achieved in 28 (77.8%), 17 (60.7%), and 13 patients (59.1%), respectively ( p > 0.05). Conclusion . The navigated pattern approach allows improving the treatment time and pain in postoperative 360° LRP. Moreover, 360° pattern LRP is at least as effective in achieving the surgical goal as the conventional (slit-lamp or indirect ophthalmoscope) approaches with a single-spot laser.

Practical laser safety

International Nuclear Information System (INIS)

Winburn, D.C.

1985-01-01

This book includes discussions of the following topics: characteristics of lasers; eye components; skin damage thresholds; classification of lasers by ANSI Z136.1; selecting laser-protective eyewear; hazards associated with lasers; and, an index

Lasers technology

International Nuclear Information System (INIS)

2014-01-01

The Laser Technology Program of IPEN is developed by the Center for Lasers and Applications (CLA) and is committed to the development of new lasers based on the research of new optical materials and new resonator technologies. Laser applications and research occur within several areas such as Nuclear, Medicine, Dentistry, Industry, Environment and Advanced Research. Additional goals of the Program are human resource development and innovation, in association with Brazilian Universities and commercial partners

LASERS: A cryogenic slab CO laser

Science.gov (United States)

Ionin, Andrei A.; Kozlov, A. Yu; Seleznev, L. V.; Sinitsyn, D. V.

2009-03-01

A compact capacitive transverse RF-discharge-pumped slab CO laser with cryogenically cooled electrodes, which operates both in the cw and repetitively pulsed regimes, is fabricated. The laser operation is studied in the free running multifrequency regime at the vibrational - rotational transitions of the fundamental (V + 1 → V) vibrational bands of the CO molecule in the spectral region from 5.1 to 5.4 μm. Optimal operation conditions (gas mixture composition and pressure, RF pump parameters) are determined. It is shown that only gas mixtures with a high content of oxygen (up to 20% with respect to the concentration of CO molecules) can be used as an active medium of this laser. It is demonstrated that repetitively pulsed pumping is more efficient compared to cw pumping. In this case, quasi-cw lasing regime can be obtained. The maximum average output power of ~12 W was obtained for this laser operating on fundamental bands and its efficiency achieved ~14 %. The frequency-selective operation regime of the slab RF-discharge-pumped CO laser was realised at ~ 100 laser lines in the spectral region from 5.0 to 6.5 μm with the average output power of up to several tens of milliwatts in each line. Lasing at the transitions of the first vibrational overtone (V + 2 → V) of the CO molecule is obtained in the spectral region from 2.5 to 3.9 μm. The average output power of the overtone laser achieved 0.3 W. All the results were obtained without the forced gas mixture exchange in the discharge chamber. Under fixed experimental conditions, repetitively pulsed lasing (with fluctuations of the output characteristics no more than ±10 %) was stable for more than an hour.

Laser Stabilization with Laser Cooled Strontium

DEFF Research Database (Denmark)

Christensen, Bjarke Takashi Røjle

The frequency stability of current state-of-the-art stabilized clock lasers are limited by thermal fluctuations of the ultra-stable optical reference cavities used for their frequency stabilization. In this work, we study the possibilities for surpassing this thermal limit by exploiting the nonli......The frequency stability of current state-of-the-art stabilized clock lasers are limited by thermal fluctuations of the ultra-stable optical reference cavities used for their frequency stabilization. In this work, we study the possibilities for surpassing this thermal limit by exploiting...... the nonlinear effects from coupling of an optical cavity to laser cooled atoms having a narrow transition linewidth. Here, we have realized such a system where a thermal sample of laser cooled strontium-88 atoms are coupled to an optical cavity. The strontium-88 atoms were probed on the narrow 1S0-3P1 inter......-combination line at 689 nm in a strongly saturated regime. The dynamics of the atomic induced phase shift and absorption of the probe light were experimentally studied in details with the purpose of applications to laser stabilization. The atomic sample temperature was in the mK range which brought this system out...

Measurements of laser parameters for the Shiva laser fusion facility

International Nuclear Information System (INIS)

Ozarski, R.G.

1979-01-01

Large laser systems require numerous laser diagnostics to provide configuration, performance and maintenance data to permit efficient operation. The following diagnostics for a large laser system named Shiva are discussed: (1) description of Shiva laser system, (2) what measurements are desired and or required and why, (3) what measurement techniques and packages are employed and a brief description of the operating principles of the sensors employed, and (4) the laser diagnostic data acquisition and display system

Laser beam-plasma plume interaction during laser welding

Science.gov (United States)

Hoffman, Jacek; Moscicki, Tomasz; Szymanski, Zygmunt

2003-10-01

Laser welding process is unstable because the keyhole wall performs oscillations which results in the oscillations of plasma plume over the keyhole mouth. The characteristic frequencies are equal to 0.5-4 kHz. Since plasma plume absorbs and refracts laser radiation, plasma oscillations modulate the laser beam before it reaches the workpiece. In this work temporary electron densities and temperatures are determined in the peaks of plasma bursts during welding with a continuous wave CO2 laser. It has been found that during strong bursts the plasma plume over the keyhole consists of metal vapour only, being not diluted by the shielding gas. As expected the values of electron density are about two times higher in peaks than their time-averaged values. Since the plasma absorption coefficient scales as ~N2e/T3/2 (for CO2 laser radiation) the results show that the power of the laser beam reaching the metal surface is modulated by the plasma plume oscillations. The attenuation factor equals 4-6% of the laser power but it is expected that it is doubled by the refraction effect. The results, together with the analysis of the colour pictures from streak camera, allow also interpretation of the dynamics of the plasma plume.

Para-hydrogen raman laser and its application to laser induced chemistry

International Nuclear Information System (INIS)

Tashiro, Hideo

1988-01-01

The report outlines the mechanism of the para-hydrogen Raman laser as a infrared light source, and its application to laser induced chemistry. The Stoke's wave number after a Raman shift is equal to the difference between the wave number of the CO 2 laser used for excitation and the rotation Raman wave number of the hydrogen molecule. A Raman laser can serve as an infrared source. CO 2 laser oscillation beam in the range of 9∼11 micrometers is selected and the frequency of infrared beam is varied by changing the wave number of the CO 2 laser beam. A problem with the Raman laser is that the Raman scatterring gain is small due to a large wavelength. In developing equipment, a special mechanism is required to solve this problem. A Raman laser comprises a CO 2 laser for excitation and multi-pulse Raman cells. The combination of a TEA oscillator and amplifiers gives CO 2 pulses with a peak power of about several tens of MW. Many heavy metal compounds including fluorides, carbonyl compounds and other organic compounds, absorb light with wavelengths in the same range as those of the Raman laser. Such compounds can be dissociated directly by applying Raman laser beams. The laser will be helpful for separation of isotopes, etc. (Nogami, K.)

Laser material processing

CERN Document Server

Steen, William

2010-01-01

This text moves from the basics of laser physics to detailed treatments of all major materials processing techniques for which lasers are now essential. New chapters cover laser physics, drilling, micro- and nanomanufacturing and biomedical laser processing.

Lasers in space

Science.gov (United States)

Michaelis, M. M.; Forbes, A.; Bingham, R.; Kellett, B. J.; Mathye, A.

2008-05-01

A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African connections. Historically, two of the earliest laser applications in space, were atmospheric LIDAR and lunar ranging. These applications involved atmospheric physicists, several astronauts and many of the staff recruited into the Soviet and North American lunar exploration programmes. There is a strong interest in South Africa in both LIDAR and lunar ranging. Shortly after the birth of the laser (and even just prior) theoretical work on photonic propulsion and space propulsion by laser ablation was initiated by Georgii Marx, Arthur Kantrowitz and Eugen Saenger. Present or near future experimental programs are developing in the following fields: laser ablation propulsion, possibly coupled with rail gun or gas gun propulsion; interplanetary laser transmission; laser altimetry; gravity wave detection by space based Michelson interferometry; the de-orbiting of space debris by high power lasers; atom laser interferometry in space. Far future applications of laser-photonic space-propulsion were also pioneered by Carl Sagan and Robert Forward. They envisaged means of putting Saenger's ideas into practice. Forward also invented a laser based method for manufacturing solid antimatter or SANTIM, well before the ongoing experiments at CERN with anti-hydrogen production and laser-trapping. SANTIM would be an ideal propellant for interstellar missions if it could be manufactured in sufficient quantities. It would be equally useful as a power source for the transmission of information over light year distances. We briefly mention military lasers. Last but not least, we address naturally occurring lasers in space and pose the question: "did the Big Bang lase?"

Harald Velner - insener üle poole sajandi / Harald-Adam Velner

Index Scriptorium Estoniae

Velner, Harald-Adam, 1923-2012

2008-01-01

Harald-Adam Velner on Eesti Inseneride Liidu esimene taasiseseisvumisjärgne president. Lisaks Liis Seili lühiartikkel Harald-Adam Velneri isast August Velnerist: Teedeinsenerist isa juhtis inseneride ühendust enne sõda

Vigdis Finnbogadottir / Vigdis Finnbogadottir ; interv. Astrid kannel

Index Scriptorium Estoniae

Finnbogadottir, Vigdis

2007-01-01

Maailma esimene valitud naispresident, Islandi Vabariigi president aastatel 1980-1996 Vigdis Finnbogadottir. Haridus, karjäär, tee teatridirektori toolilt presidendipostile, väikerahva keele olulisus, naised tipp-poliitikas, hariduse osatähtsus

Millest unistad ja kelleks tahad saada, ilus poiss? / Kati Murutar

Index Scriptorium Estoniae

Murutar, Kati, 1967-

2008-01-01

Rene Vilbre noortefilm "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest" : osades Rasmus Kaljujärv, Hele Kõre, Tambet Tuisk, Jaan Rekkor : Amrion Productions - Helsinki-filmi OY

Sass Henno romaani järgi valmib film

Index Scriptorium Estoniae

2007-01-01

Tallinnas jätkuvad noortefilmi "Mina olin siin" võtted. Filmi aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", lavastab Rene Vilbre, peaosas on Rasmus Kaljujärv, produtsendiks Riina Sildos

Keele salaelu / Kristiina Ross

Index Scriptorium Estoniae

Ross, Kristiina, 1955-

2004-01-01

Vana Testamendi eestikeelsest tõlkest, mille tegid ajavahemikul 1687-1690 isa ja poeg Andreas ja Adrian Virginius. Rmt.: Esimene Moosese raamat. Iiobi raamat / tõlkinud 1687-1690 Andreas ja Adrian Virginius. Tallinn, 2003

Rwandas võtsid võimu naised / Allan Espenberg

Index Scriptorium Estoniae

Espenberg, Allan

2008-01-01

Septembris toimunud parlamendivalimiste järel sai Aafrikas asuvast Rwandast esimene riik, kus parlamendiliikmete hulgas on rohkem naisi kui mehi. Ka parlamendi alamkoja etteotsa valiti naine - naisõiguslane ja õigusteaduste doktor Rose Mukantabana

Georg R. R. Martin: "Jää ja tule laul" filmi ei mahu / intervjueerinud Hendrik Alla

Index Scriptorium Estoniae

Martin, George R. R., 1948-

2011-01-01

USA telekanali HBO telesarjast "Troonide mäng", George R. R. Martini "Jää ja tule laulu" sarja esimese raamatu "Troonide mäng" teleekraniseeringust. Sarja esimene osa esilinastus USA-s 17. aprillil

Geroi komiksa : so stranits - na ekranõ / Oleg Nikolajev

Index Scriptorium Estoniae

Nikolajev, Oleg

2000-01-01

Koomiksite jõudmisest kinoekraanidele. Mängufilm "X-mehed" ("X-Men") oli esimene kirjastuse Marvel Comics poolt väljaantud koomiksi põhjal tehtud film. Kavas on Hollywoodil neid praegu vähemalt 12

"Käed segasid tühjalt kaarte ikka edasi, kuigi ise olin juba Une-Mati kaisus" / Urmas Vahe

Index Scriptorium Estoniae

Vahe, Urmas

2007-01-01

Maag Meelis Kubo, kes alustab ajalehes oma võlukunsti tutvustava rubriigiga. Lisaks lühitutvustus "Kes on Meelis Kubo?", sissejuhatus artikliteseeriasse "Kuidas ise mustkunsti teha?" ja esimene trikk : "Kas su isa on elektrik?"

Frequency-doubled diode laser for direct pumping of Ti:sapphire lasers

DEFF Research Database (Denmark)

Müller, André; Jensen, Ole Bjarlin; Unterhuber, Angelika

2012-01-01

. However, the superior electro-optical efficiency of the diode laser improves the overall efficiency of the Ti:sapphire laser by a factor > 2. The optical spectrum emitted by the Ti:sapphire laser shows a spectral width of 112 nm (FWHM). Based on autocorrelation measurements, pulse widths of less than 20...... fs are measured. These results open the opportunity of establishing diode laser pumped Ti:sapphire lasers for e.g. biophotonic applications like retinal optical coherence tomography or pumping of photonic crystal fibers for CARS microscopy.......A single-pass frequency doubled high-power tapered diode laser emitting nearly 1.3 W of green light suitable for direct pumping of Ti:sapphire lasers generating ultrashort pulses is demonstrated. The pump efficiencies reached 75 % of the values achieved with a commercial solid-state pump laser...

Excimer laser applications

International Nuclear Information System (INIS)

Fantoni, R.

1988-01-01

This lecture deals with laser induced material photoprocessing, especially concerning those processes which are initiated by u.v. lasers (mostly excimer laser). Advantages of using the u.v. radiation emitted by excimer lasers, both in photophysical and photochemical processes of different materials, are discussed in detail. Applications concerning microelectronics are stressed with respect to other applications in different fields (organic chemistry, medicine). As further applications of excimer lasers, main spectroscopic techniques for ''on line'' diagnostics which employ excimer pumped dye lasers, emitting tunable radiation in the visible and near u.v. are reviewed

Technological laser application

International Nuclear Information System (INIS)

Shia, D.O.; Kollen, R.; Rods, U.

1980-01-01

Problems of the technological applications of lasers are stated in the popular form. Main requirements to a technological laser as well as problems arising in designing any system using lasers have been considered. Areas of the laser applications are described generally: laser treatment of materials, thermal treatment, welding, broach and drilling of holes, scribing, microtreatment and adjustment of resistors, material cutting, investigations into controlled thermonuclear fussion

Effects of laser fluence on silicon modification by four-beam laser interference

International Nuclear Information System (INIS)

Zhao, Le; Li, Dayou; Wang, Zuobin; Yue, Yong; Zhang, Jinjin; Yu, Miao; Li, Siwei

2015-01-01

This paper discusses the effects of laser fluence on silicon modification by four-beam laser interference. In this work, four-beam laser interference was used to pattern single crystal silicon wafers for the fabrication of surface structures, and the number of laser pulses was applied to the process in air. By controlling the parameters of laser irradiation, different shapes of silicon structures were fabricated. The results were obtained with the single laser fluence of 354 mJ/cm 2 , 495 mJ/cm 2 , and 637 mJ/cm 2 , the pulse repetition rate of 10 Hz, the laser exposure pulses of 30, 100, and 300, the laser wavelength of 1064 nm, and the pulse duration of 7–9 ns. The effects of the heat transfer and the radiation of laser interference plasma on silicon wafer surfaces were investigated. The equations of heat flow and radiation effects of laser plasma of interfering patterns in a four-beam laser interference distribution were proposed to describe their impacts on silicon wafer surfaces. The experimental results have shown that the laser fluence has to be properly selected for the fabrication of well-defined surface structures in a four-beam laser interference process. Laser interference patterns can directly fabricate different shape structures for their corresponding applications

Laser innovated manufacturing technology; Laser ga seisan gijutsu wo kakushinshita

Energy Technology Data Exchange (ETDEWEB)

Maruyama, I. [Honda Motor Co. Ltd., Tokyo (Japan)

1996-11-01

This paper looks back the history of applications of laser processing in the automobile industry, and introduces contents of some particularly unique applications from among them. The CO2 laser and YAG laser that are used mainly have increased their outputs with the times, and 50-kW CO2 laser and 4-kW YAG laser have now become available commercially. The laser processing has become used widely for cutting purpose in Japan, which is in contrast with their high application to welding in Europe and America. Cutting thick plates has been developed recently, which is applicable to plates as thick as about 25 mm. A flexible system in which YAG laser is combined with an optical fiber/articulated robot is operating for three-dimensional shape processing. Automobile makers are adopting laser processing for welding in place of the electron beam welding that has been used conventionally. The process is used also for a number of other applications including surface reformation, such as surface quenching for cylinder liner, and valve seat padding. 8 refs., 8 figs.

Meltshajet mir, meltshajut ljudi ... / Ilze Liepa ; interv. Olga Vassiljeva

Index Scriptorium Estoniae

Liepa, Ilze

2000-01-01

Tantsijanna Ilze Liepa esimene roll draamateatris on Maria Stuart Ljudmila Razumovskaja näidendis "Teie õde ja vang", lavastaja Oleg Ogi. Peterburi teatri Teatrimaja (Teatralnõi dom) külalisetendused 18. detsembril Vene Kultuurikeskuses

Vaclav Havel avaldas president Ilvesele solidaarsust

Index Scriptorium Estoniae

2007-01-01

Tshehhi Vabariigi esimene president Vaclav Havel saatis president Toomas Hendrik Ilvesele ja Eesti rahvale toetusavalduse seoses viimase kuu jooksul toimunud Venemaa rünnakutega Eesti vastu. Ingl. k. lk. 12, pealk.: Havel supports Estonia

Taotlused ja tulemus / Rein Tootmaa

Index Scriptorium Estoniae

Tootmaa, Rein

2002-01-01

Helle Karise kavandatava portreefilmide sarja "Contra mortem" esimene film "Dr. Andres Ellamaa" : operaatorid Peter Murdmaa ja Marko Piirsoo : monteerija Eero Karis : produtsendid Helle Karis ja Maret Hirtentreu : kasutatud Carl Orffi muusikat : Myth Film 2002

Doktor Ellamaa elutants / Linnar Priimägi

Index Scriptorium Estoniae

Priimägi, Linnar, 1954-

2002-01-01

Helle Karise kavandatava portreefilmide sarja "Contra mortem" esimene film "Dr. Andres Ellamaa" : operaatorid Peter Murdmaa ja Marko Piirsoo : monteerija Eero Karis : produtsendid Helle Karis ja Maret Hirtentreu : kasutatud Carl Orffi muusikat : Myth Film 2002

Bin Ladeni saladusliku autojuhi juhtum on lõplikult lahendamata / Hendrik Vosman

Index Scriptorium Estoniae

Vosman, Hendrik

2008-01-01

Guantanamos USA-s lõppes esimene sõjaroimaprotsess peale Teist maailmasõda. Ka kohtuasjast "Hamdan vs Rumsfeld", mis oli seotud katsega Guantanamos kinni peetavaid nn vaenlasvõitlejaid sõjaväekomisjonides kohtu ette tuua

Mark Soosaar näitab Eesti loomisest tehtud filme / Silja Joon

Index Scriptorium Estoniae

Joon, Silja, 1966-

2008-01-01

Pärnu uue kunsti muuseumis linastub 22.-24. veebruarini Eesti Vabariigi juubeli puhul filmiprogramm Mark Soosaare dokumentaalfilmidest. Lühitutvustused filmidest "Kihnu Kristjan", "Miss Saaremaa", "Riigivanem", "Vabatahtlikud", "Eesti esimene kodanik" ning info nende autori kohta

YES-liikumine annab endast värvikalt märku / Lilian-Hanna Taimla, Heiko Teern ; intervjueerinud Sirje Pärismaa

Index Scriptorium Estoniae

Taimla, Lilian-Hanna, 1961-

2009-01-01

Maaülikoolis alguse saanud YES-liikumise (Young Environmental Specialists) arhitektuurinäituse "Minu päris esimene enda projekteeritud unistuste kodu" uues spordihoones korraldasid maaülikooli kunsti- ja disainigrupp ning maaehituse osakond

F. J. Wiedemanni keeleauhind on lakanud. Elagu F. J. Wiedemanni keeleauhind! / Eevi Ross

Index Scriptorium Estoniae

Ross, Eevi

2003-01-01

15-ndad ja viimased F. J. Wiedemanni Keeleauhinna Sihtasutuse laureaadid on Mati Hint ja Helju Vals, järgmisel aastal antakse välja esimene riiklik F. J. Wiedemanni keeleauhind Eesti Vabariigi peaministri poolt

Jõhvi teeb j'älle Tallinnale ära / Tiit Tuumalu

Index Scriptorium Estoniae

Tuumalu, Tiit, 1971-

2008-01-01

Seoses Age Oksa balletikarjäärist loobumisega võiks Estonia teha sümboolse zhesti ja kutsuda nad oma lavale tantsima. Inglise Rahvuslikus Balletis tantsinud Age Oksa jaoks oli Estonia tema esimene koduteater

Tüdruku muutunud veregrupp andis teadlastele idee / Alo Lõhmus

Index Scriptorium Estoniae

Lõhmus, Alo

2008-01-01

Austraalia tüdruk on esimene teadaolev inimene, kelle organism on muutnud veregruppi ning võtnud üle siirdatud organi immuunsüsteemi. Teadlastele andis see idee äratõukereaktsioonide vältimiseks organisiirdamistel

Slesers says spend, spend, spend

Index Scriptorium Estoniae

2011-01-01

5. augustil kinnitas Läti Esimene Partei/Läti Tee parlamendivalimiste valimisplatvormi, mille peamine mõte seisneb selles, et raha tuleb teenida, mitte säästa. Zatlersi Reformierakond on samuti oma valimisplatvormi kinnitanud

Obama suunab kahuritule teadmata kadunud Osamale / Heiki Suurkask

Index Scriptorium Estoniae

Suurkask, Heiki, 1972-

2009-01-01

Autori sõnul on USA tähelepanu hajumine võimaldanud al-Qaidal peituda ja neid varjaval Talibanil uuesti tugevneda. Esimene muutus, mille Barack Obama USA presidendina tegi, oli katse islamimaailma terroristidest eemale meelitada

The Mercury Laser Advances Laser Technology for Power Generation

Energy Technology Data Exchange (ETDEWEB)

Ebbers, C A; Caird, J; Moses, E

2009-01-21

The National Ignition Facility (NIF) at Lawrence Livermore Laboratory is on target to demonstrate 'breakeven' - creating as much fusion-energy output as laser-energy input. NIF will compress a tiny sphere of hydrogen isotopes with 1.8 MJ of laser light in a 20-ns pulse, packing the isotopes so tightly that they fuse together, producing helium nuclei and releasing energy in the form of energetic particles. The achievement of breakeven will culminate an enormous effort by thousands of scientists and engineers, not only at Livermore but around the world, during the past several decades. But what about the day after NIF achieves breakeven? NIF is a world-class engineering research facility, but if laser fusion is ever to generate power for civilian consumption, the laser will have to deliver pulses nearly 100,000 times faster than NIF - a rate of perhaps 10 shots per second as opposed to NIF's several shots a day. The Mercury laser (named after the Roman messenger god) is intended to lead the way to a 10-shots-per-second, electrically-efficient, driver laser for commercial laser fusion. While the Mercury laser will generate only a small fraction of the peak power of NIF (1/30,000), Mercury operates at higher average power. The design of Mercury takes full advantage of the technology advances manifest in its behemoth cousin (Table 1). One significant difference is that, unlike the flashlamp-pumped NIF, Mercury is pumped by highly efficient laser diodes. Mercury is a prototype laser capable of scaling in aperture and energy to a NIF-like beamline, with greater electrical efficiency, while still running at a repetition rate 100,000 times greater.

Laser program overview

International Nuclear Information System (INIS)

Storm, E.; Coleman, L.W.

1985-01-01

The objectives of the Lawrence Livermore National Laboratory Laser Fusion program are to understand and develop the science and technology of inertial confinement fusion (ICF), and to utilize ICF in short- and long-term military applications, and, in the long-term, as a candidate for central-station civilian power generation. In 1984, using the Novette laser system, the authors completed experiments showing the very favorable scaling of laser-plama interactions with short-wavelength laser light. Their Novette experiments have unequivocally shown that short laser wavelength, i.e., less than 1 μm, is required to provide the drive necessary for efficient compression, ignition, and burn of DT fusion fuel. In other experiments with Novette, the authors made the first unambiguous observation of amplified spontaneous emission in the soft x-ray regime. The authors also conducted military applications and weapons physics experiments, which they discuss in detail in the classified volume of our Laser Program Annual Report. In the second thrust, advanced laser studies, they develop and test the concepts, components, and materials for present and future laser systems. Over the years, this has meant providing the technology base and scientific advances necessary to construct and operate a succession of six evermore-powerful laser systems. The latest of these, Nova, a 100-TW/100-kJ-class laser system, was completed in 1984. The Nd:glass laser continues to be the most effective and versatile tool for ICF and weapons physics because of its scalability in energy, the ability to efficiently convert its 1=μm output to shorter wavelengths, its ability to provide flexible, controlled pulse shaping, and its capability to adapt to a variety of irradiation and focusing geometries. For these reasons, many of our advanced laser studies are in areas appropriate to solid state laser technologies

Power balancing of multibeam laser fusion lasers

International Nuclear Information System (INIS)

Seka, W.; Morse, S.; Letzring, S.; Kremens, R.; Kessler, T.J.; Jaanimagi, P.; Keck, R.; Verdon, C.; Brown, D.

1989-01-01

The success of laser fusion depends to a good degree on the ability to compress the target to very high densities of ≥1000 times liquid DT. To achieve such compressions require that the irradiation nonuniformity must not exceed ∼1% rms over the whole time of the compression, particularly during the early phases of irradiation. The stringent requirements for the irradiation uniformity for laser fusion have been known for quite some time but until recently the energy balance was mistakenly equated to power balance. The authors describe their effort on energy balance and irradiation patterns on the target. They significantly improved the laser performance with respect to overall intensity distributions on target including the implementation of distributed (random) phase plates in each high power beam. However, the slightly varying performance of the third harmonic conversion crystals in the twenty-four beams of their laser system was generally compensated for by appropriately adjusted 1.054μm input laser energy. Computational analysis of the results of the recent high density campaign are shown

Biocavity Lasers

Energy Technology Data Exchange (ETDEWEB)

Gourley, P.L.; Gourley, M.F.

2000-10-05

Laser technology has advanced dramatically and is an integral part of today's healthcare delivery system. Lasers are used in the laboratory analysis of human blood samples and serve as surgical tools that kill, burn or cut tissue. Recent semiconductor microtechnology has reduced the size o f a laser to the size of a biological cell or even a virus particle. By integrating these ultra small lasers with biological systems, it is possible to create micro-electrical mechanical systems that may revolutionize health care delivery.

An overview of the laser ranging method of space laser altimeter

Science.gov (United States)

Zhou, Hui; Chen, Yuwei; Hyyppä, Juha; Li, Song

2017-11-01

Space laser altimeter is an active remote sensing instrument to measure topographic map of Earth, Moon and planetary. The space laser altimeter determines the range between the instrument and laser footprint by measuring round trip time of laser pulse. The return pulse reflected from ground surface is gathered by the receiver of space laser altimeter, the pulsewidth and amplitude of which are changeable with the variability of the ground relief. Meantime, several kinds of noise overlapped on the return pulse signal affect its signal-to-noise ratio. To eliminate the influence of these factors that cause range walk and range uncertainty, the reliable laser ranging methods need to be implemented to obtain high-precision range results. Based on typical space laser altimeters in the past few decades, various ranging methods are expounded in detail according to the operational principle of instruments and timing method. By illustrating the concrete procedure of determining time of flight of laser pulse, this overview provides the comparison of the employed technologies in previous and undergoing research programs and prospect innovative technology for space laser altimeters in future.

Novel laterally pumped by prism laser configuration for compact solid-state lasers

International Nuclear Information System (INIS)

Dascalu, T; Salamu, G; Sandu, O; Voicu, F; Pavel, N

2013-01-01

We propose a new laser configuration in which the pump radiation is coupled into the laser crystal through a prism. The laser medium is square shaped and the prism is attached on one of its lateral sides, near one of the crystal extremities. The diode-laser fiber end is placed close to the prism hypotenuse, the pump radiation is coupled into the laser crystal through the opposite surface of the prism and propagates into the crystal through total internal reflections. This laser geometry is simple to align and permits the realization of compact diode-pumped laser systems, as well as power scaling. A diode-pumped Nd:YAG laser yielding pulses of 2.1 mJ energy under a pump with pulses of 9.9 mJ is demonstrated. The laser slope efficiency is 0.22. Furthermore, this geometry enables one to obtain passively Q-switched lasers with the saturable absorber crystal placed between the resonator high-reflectivity mirror and the laser crystal. A Nd:YAG laser, passively Q-switched by a Cr 4+ :YAG crystal with initial transmission T 0 = 0.90, delivering laser output with a pulsed energy of 93 μJ, a duration of 26 ns and a pump threshold of 1.9 mJ, is realized in order to prove the concept. (letter)

A Laser Technology Test Facility for Laser Inertial Fusion Energy (LIFE)

International Nuclear Information System (INIS)

Bayramian, A.J.; Campbell, R.W.; Ebbers, C.A.; Freitas, B.L.; Latkowski, J.; Molander, W.A.; Sutton, S.B.; Telford, S.; Caird, J.A.

2010-01-01

A LIFE laser driver needs to be designed and operated which meets the rigorous requirements of the NIF laser system while operating at high average power, and operate for a lifetime of >30 years. Ignition on NIF will serve to demonstrate laser driver functionality, operation of the Mercury laser system at LLNL demonstrates the ability of a diode-pumped solid-state laser to run at high average power, but the operational lifetime >30 yrs remains to be proven. A Laser Technology test Facility (LTF) has been designed to specifically address this issue. The LTF is a 100-Hz diode-pumped solid-state laser system intended for accelerated testing of the diodes, gain media, optics, frequency converters and final optics, providing system statistics for billion shot class tests. These statistics will be utilized for material and technology development as well as economic and reliability models for LIFE laser drivers.

Robot-laser system

International Nuclear Information System (INIS)

Akeel, H.A.

1987-01-01

A robot-laser system is described for providing a laser beam at a desired location, the system comprising: a laser beam source; a robot including a plurality of movable parts including a hollow robot arm having a central axis along which the laser source directs the laser beam; at least one mirror for reflecting the laser beam from the source to the desired location, the mirror being mounted within the robot arm to move therewith and relative thereto to about a transverse axis that extends angularly to the central axis of the robot arm; and an automatic programmable control system for automatically moving the mirror about the transverse axis relative to and in synchronization with movement of the robot arm to thereby direct the laser beam to the desired location as the arm is moved

Development of a compact vertical-cavity surface-emitting laser end-pumped actively Q-switched laser for laser-induced breakdown spectroscopy

Energy Technology Data Exchange (ETDEWEB)

Li, Shuo; Chen, Rongzhang; Nelsen, Bryan; Chen, Kevin, E-mail: pec9@pitt.edu [Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States); Liu, Lei; Huang, Xi; Lu, Yongfeng [Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)

2016-03-15

This paper reports the development of a compact and portable actively Q-switched Nd:YAG laser and its applications in laser-induced breakdown spectroscopy (LIBS). The laser was end-pumped by a vertical-cavity surface-emitting laser (VCSEL). The cavity lases at a wavelength of 1064 nm and produced pulses of 16 ns with a maximum pulse energy of 12.9 mJ. The laser exhibits a reliable performance in terms of pulse-to-pulse stability and timing jitter. The LIBS experiments were carried out using this laser on NIST standard alloy samples. Shot-to-shot LIBS signal stability, crater profile, time evolution of emission spectra, plasma electron density and temperature, and limits of detection were studied and reported in this paper. The test results demonstrate that the VCSEL-pumped solid-state laser is an effective and compact laser tool for laser remote sensing applications.

Laser in urology

International Nuclear Information System (INIS)

Breisland, H.O.

1991-01-01

The neodymium YAG laser is particularly suited for endoscopic urologic surgery because the YAG laser light can be conducted in flexible fibers. Superficial bladder tumours can be treated under local anaesthesia in the outpatient department. The frequency of local recurrences is low, significantly lower than after electrosection or electrocoagulation. Selected cases of T2-muscle invasive bladder tumours can be cured with laser coagulation applied subsequently to transurethral resection. Combined treatment with electrosection and laser coagulation of localized prostatic cancer is a promising method which compares favourably with results obtained by other treatment modalities. Tumours in the upper urinary tract can be laser-treated through ureteroscopes or nephroscopes, but the treatment should be limited to low stage, low grade tumours. Laser is the treatment of choice for intraurethral condylomatas. Laser treatment of penil carcinoma gives excellent cosmetic and functional results and few local recurrences. Laser lithotripsy is a new technique for treatment of ureteric stones and photodynamic laser therapy is a promising tecnique for treatment of carcinoma in situ in the bladder empithelium. However, neither of these techniques are available for clinical use in Norway as yet. 17 refs., 3 figs., 1 tabs

Laser-induced interactions

International Nuclear Information System (INIS)

Green, W.R.

1979-01-01

This dissertation discusses some of the new ways that lasers can be used to control the energy flow in a medium. Experimental and theoretical considerations of the laser-induced collision are discussed. The laser-induced collision is a process in which a laser is used to selectively transfer energy from a state in one atomic or molecular species to another state in a different species. The first experimental demonstration of this process is described, along with later experiments in which lasers were used to create collisional cross sections as large as 10 - 13 cm 2 . Laser-induced collisions utilizing both a dipole-dipole interaction and dipole-quadrupole interaction have been experimentally demonstrated. The theoretical aspects of other related processes such as laser-induced spin-exchange, collision induced Raman emission, and laser-induced charge transfer are discussed. Experimental systems that could be used to demonstrate these various processes are presented. An experiment which produced an inversion of the resonance line of an ion by optical pumping of the neutral atom is described. This type of scheme has been proposed as a possible method for constructing VUV and x-ray lasers

Esilinastus väge täis "Mina olin siin" / Kutt Kommel

Index Scriptorium Estoniae

Kommel, Kutt

2008-01-01

Rene Vilbre noortefilm "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest" : operaator Mait Mäekivi : osades Rasmus Kaljujärv, Hele Kõre jt : Amrion Productions - Helsinki-filmi OY 2008

Esimesel arestil on absurdi maitse / Aarne Ruben

Index Scriptorium Estoniae

Ruben, Aarne, 1971-

2008-01-01

Rene Vilbre noortefilmist "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest" : stsenarist Ilmar Raag, peaosas Rasmus Kaljujärv (Amrion Productions ja Helsinki Film, 2008). Filmi apsakatest ja ebaloogilisusest

Noor Eesti teadlane sai maineka Briti stipendiumi / Aive Sarjas

Index Scriptorium Estoniae

Sarjas, Aive

2012-01-01

Eesti Maaülikooli veterinaarmeditsiini ja loomakasvatuse instituudi doktorant Kristi Kernerist sai esimene inimene väljaspool Ühendkuningriiki, kelle loomade heaolu teemalist projekti autasustas Humane Slaughter Association prestiižsse Dorothy Sidley nimelise stipendiumiga

Doktorant sai loomade heaolu uurimise eest haruldase stipendiumi / Mari Aigro

Index Scriptorium Estoniae

Aigro, Mari

2012-01-01

Eesti Maaülikooli veterinaarmeditsiini ja loomakasvatuse instituudi doktorant Kristi Kernerist sai esimene inimene väljaspool Ühendkuningriiki, kelle loomade heaolu teemalist projekti autasustas Humane Slaughter Association prestiižsse Dorothy Sidley nimelise stipendiumiga

Молодежь пришла на кастинг в кино / Лилия Крысина

Index Scriptorium Estoniae

Крысина, Лилия

2011-01-01

Tallinnas toimus esimene kasting (näitlejate rollidesse ja massistseenidesse otsimine) Venemaa Esimese Kanali, Esimese Balti Kanali ja Walt Disney Company ühisprojekti, muusikalisse teleseriaali "После школы"

"Вы хотите сниматься в кино?" / Нина Рачинская

Index Scriptorium Estoniae

Рачинская, Нина

2011-01-01

Tallinnas toimus esimene kasting (näitlejate rollidesse ja massistseenidesse otsimine) Venemaa Esimese Kanali, Esimese Balti Kanali ja Walt Disney Company ühisprojekti, muusikalisse teleseriaali "После школы"

Anneli Remme soovitab : Kuninganna Mary elu ja surm / Anneli Remme

Index Scriptorium Estoniae

Remme, Anneli, 1968-

2002-01-01

Kontserdisarja "Hingemuusika" teist kontserti raamivad Henry Purcelli teosed, millest esimene on loodud kuninganna Mary sünnipäevaks, viimane matusetseremooniaks. Barokkansambli Corelli Consort esituses 26., 27., ja 28. apr. Viljandi, Tartu ja Tallinna kirikutes

Pedagoogikaülikoolis saab õppida eurotõlgiks / Helve Laasik

Index Scriptorium Estoniae

Laasik, Helve, 1958-

2002-01-01

2002. a. avas Tallinna Pedagoogikaülikool tõlkide magistriõppe, konkurss oli suur. Magistriõpe kestab kaks aastat, esimene semester on sissejuhatav, teisest semestrist lähevad suuliste ja kirjalike tõlkide õppekavad lahku

Duell diktaatoriga / Juri Hashtshevatski ; interv. Kelly Grossthal, Maari Ross

Index Scriptorium Estoniae

Hashtshevatski, Juri

2007-01-01

Tallinnas linastub esimene Eesti-Valgevene ühistöö "Kalinovski väljak", dokumentaalfilm Valgevene kuulsaima režissööri pikalt kestnud ja ohtlikust konfliktist diktaator Lukashenkaga. Poliitilisest olukorrast Valgevenes, president Aleksandr Lukashenkast

Uus raamatusari õpetajatele / Inga Kukk

Index Scriptorium Estoniae

Kukk, Inga

2003-01-01

Haridus- ja teadusministeerium hakkas välja andma tänapäeva pedagoogika raamatusarja "XXI sajandi kool". Ilmumas on esimene raamat: George Watson. Koolikäitumise käsiraamat. Kommenteerivad Jaan Kõrgesaar, Krista Sillar

Krovavõi pretsedent

Index Scriptorium Estoniae

2001-01-01

Eestis on toime pandud esimene massi-meedia suurärimehe tellimusmõrv. Suhtumisest V. Haitovi mõrva kommenteerivad P. Põiklik, J. Ragrin, N. Solovei, N. Maspanov, A. Zõbin, H. H. Luik, J. Kogan, A. Tõnisson

Gay pride parade evokes right-wing ire / Aaron Eglitis

Index Scriptorium Estoniae

Eglitis, Aaron

2005-01-01

23. juulil peaks Riias aset leidma esimene geide, lesbide ja biseksuaalide paraad. Hulk parempoolseid opositsioonipoliitikuid ja noorteorganisatsioone on asunud ettevõtmist blokeerima. 19. juulil otsustas valitsus keelata diskrimineerimise töökohal seksuaalse orientatsiooni alusel

Multimegajoule laser project: new compact multipass laser design

International Nuclear Information System (INIS)

Holzrichter, J.F.

1985-01-01

A simple laser design that has the fewest laser components of all fusion systems that the authors have studied and that packs closely, thus minimizing space requirements is shown. The Advanced Laser Program objectives are determined by the requirements of the subsystems. The requirements consists of the following elements: high damage thresholds on reflectors; AR layers and dichroic coatings; high-efficiency amplifiers; low-cost production of laser glass, pulse power, and optical elements; and special optical elements, such as an effective phase conjugator and isolator. The combination of a compact architecture and lower-cost, higher-performance components can lead to significant reduction in overall system cost

Laser Propulsion - Quo Vadis

International Nuclear Information System (INIS)

Bohn, Willy L.

2008-01-01

First, an introductory overview of the different types of laser propulsion techniques will be given and illustrated by some historical examples. Second, laser devices available for basic experiments will be reviewed ranging from low power lasers sources to inertial confinement laser facilities. Subsequently, a status of work will show the impasse in which the laser propulsion community is currently engaged. Revisiting the basic relations leads to new avenues in ablative and direct laser propulsion for ground based and space based applications. Hereby, special attention will be devoted to the impact of emerging ultra-short pulse lasers on the coupling coefficient and specific impulse. In particular, laser sources and laser propulsion techniques will be tested in microgravity environment. A novel approach to debris removal will be discussed with respect to the Satellite Laser Ranging (SRL) facilities. Finally, some non technical issues will be raised aimed at the future prospects of laser propulsion in the international community

Distributed feedback dye laser pumped with copper-vapor laser emission

Energy Technology Data Exchange (ETDEWEB)

Mirza, S Yu; Soldatov, A N; Sukhanov, V B

1983-10-01

The power-spectrum characteristics of the emission of a distributed feedback dye laser pumped with a copper vapor laser have been studied. Laser action has been observed in five dyes over a tuning range of 530-723 nm with an efficiency of 12.4%. The specfic features of the distributed feedback dye laser operating at pulse repetition rates of 4 kHz are discussed.

Influence of the laser pulse duration on laser-produced plasma properties

International Nuclear Information System (INIS)

Drogoff, B Le; Margot, J; Vidal, F; Laville, S; Chaker, M; Sabsabi, M; Johnston, T W; Barthelemy, O

2004-01-01

In the framework of laser-induced plasma spectroscopy (LIPS) applications, time-resolved characteristics of laser-produced aluminium plasmas in air at atmospheric pressure are investigated for laser pulse durations ranging from 100 fs to 270 ps. Measurements show that for delays after the laser pulse longer than ∼100 ns, the plasma temperature increases slightly with the laser pulse duration, while the electron density is independent of it. In addition, as the pulse duration increases, the plasma radiation emission lasts longer and the spectral lines arise later from the continuum emission. The time dependence of the continuum emission appears to be similar whatever the duration of the laser pulse is, while the temporal evolution of the line emission seems to be affected mainly by the plasma temperature. Finally, as far as spectrochemical applications (such as LIPS) of laser-produced plasmas are concerned, this study highlights the importance of the choice of appropriate temporal gating parameters for each laser pulse duration

Laser cleaning of pulsed laser deposited rhodium films for fusion diagnostic mirrors

International Nuclear Information System (INIS)

Uccello, A.; Maffini, A.; Dellasega, D.; Passoni, M.

2013-01-01

Highlights: ► Pulsed laser deposition is exploited to produce Rh films for first mirrors. ► Pulsed laser deposition is exploited to produce tokamak-like C contaminants. ► Rh laser damage threshold has been evaluated for infrared pulses. ► Laser cleaning of C contaminated Rh films gives promising results. -- Abstract: In this paper an experimental investigation on the laser cleaning process of rhodium films, potentially candidates to be used as tokamak first mirrors (FMs), from redeposited carbon contaminants is presented. A relevant issue that lowers mirror's performance during tokamak operations is the redeposition of sputtered material from the first wall on their surface. Among all the possible techniques, laser cleaning, in which a train of laser pulses is launched to the surface that has to be treated, is a method to potentially mitigate this problem. The same laser system (Q-switched Nd:YAG laser with a fundamental wavelength of 1064-nm and 7-ns pulses) has been employed with three aims: (i) production by pulsed laser deposition (PLD) of Rh film mirrors, (ii) production by PLD of C deposits with controlled morphology, and (iii) investigation of the laser cleaning method onto C contaminated Rh samples. The evaluation of Rh films laser damage threshold, as a function of fluence and number of pulses, is discussed. Then, the C/Rh films have been cleaned by the laser beam. The exposed zones have been characterized by visual inspection and scanning electron microscopy (SEM), showing promising results

Attenuation of laser power of a focused Gaussian beam during interaction between a laser and powder in coaxial laser cladding

International Nuclear Information System (INIS)

Liu Jichang; Li Lijun; Zhang Yuanzhong; Xie Xiaozhu

2005-01-01

The power of a focused laser beam with a Gaussian intensity profile attenuated by powder in coaxial laser cladding is investigated experimentally and theoretically, and its resolution model is developed. With some assumptions, it is concluded that the attenuation of laser power is an exponential function and is determined by the powder feed rate, particle moving speed, spraying angles and waist positions and diameters of the laser beam and powder flow, grain diameter and run of the laser beam through the powder flow. The attenuation of laser power increases with powder feed rate or run of laser beam through the powder flow. In the experiment presented, 300 W laser power from a focused Gaussian beam is attenuated by a coaxial powder flow. The experimental results agree well with the values calculated with the developed model

Tunable laser applications

CERN Document Server

Duarte, FJ

2008-01-01

Introduction F. J. Duarte Spectroscopic Applications of Tunable Optical Parametric Oscillators B. J. Orr, R. T. White, and Y. He Solid-State Dye Lasers Costela, I. García-Moreno, and R. Sastre Tunable Lasers Based on Dye-Doped Polymer Gain Media Incorporating Homogeneous Distributions of Functional Nanoparticles F. J. Duarte and R. O. James Broadly Tunable External-Cavity Semiconductor Lasers F. J. Duarte Tunable Fiber Lasers T. M. Shay and F. J. Duarte Fiber Laser Overview and Medical Applications

Greco Laser-matter interaction

International Nuclear Information System (INIS)

1986-01-01

Research program in 1985 at GRECO ILM (Group of Coordinated Research: Interaction Laser Matter) continued with its principal direction in fundamental physics of laser inertial confinement; also researches on X-ray lasers hare been undergone and new high power laser application fields with particle acceleration, material processing and X-ray sources. A six beam laser was operated. Wavelength effects were studied. Atomic physics was deeply stressed as dense medium diagnostics from multicharged ions. Research development in ultra-dense medium was also important X-ray laser research gave outstanding results. New research fields were developed this year: laser acceleration of particles by wave beating or Raman instability; dense laser produced plasma use as X-ray source; material processing by laser shocks [fr

Laser applications in materials processing

International Nuclear Information System (INIS)

Ready, J.F.

1980-01-01

The seminar focused on laser annealing of semiconductors, laser processing of semiconductor devices and formation of coatings and powders, surface modification with lasers, and specialized laser processing methods. Papers were presented on the theoretical analysis of thermal and mass transport during laser annealing, applications of scanning continuous-wave and pulsed lasers in silicon technology, laser techniques in photovoltaic applications, and the synthesis of ceramic powders from laser-heated gas-phase reactants. Other papers included: reflectance changes of metals during laser irradiation, surface-alloying using high-power continuous lasers, laser growth of silicon ribbon, and commercial laser-shock processes

HF laser

International Nuclear Information System (INIS)

Suzuki, Kazuya; Iwasaki, Matae

1977-01-01

A review is made of the research and development of HF chemical laser and its related work. Many gaseous compounds are used as laser media successfully; reaction kinetics and technological problems are described. The hybrid chemical laser of HF-CO 2 system and the topics related to the isotope separation are also included. (auth.)

Multibeam Fibre Laser Cutting

DEFF Research Database (Denmark)

Olsen, Flemming Ove

The appearance of the high power high brilliance fibre laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating cutting laser, the CO2-laser. However, quality problems in fibre......-laser cutting have until now limited its application in metal cutting. In this paper the first results of proof-of-principle studies applying a new approach (patent pending) for laser cutting with high brightness short wavelength lasers will be presented. In the approach, multi beam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from 2 single mode fibre lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W of single...

Multibeam fiber laser cutting

DEFF Research Database (Denmark)

Olsen, Flemming Ove; Hansen, Klaus Schütt; Nielsen, Jakob Skov

2009-01-01

The appearance of the high power high brilliance fiber laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating Cutting laser, the CO2 laser. However, quality problems in fiber......-laser cutting have until now limited its application to metal cutting. In this paper the first results of proof-of-principle Studies applying a new approach (patent pending) for laser cutting with high brightness and short wavelength lasers will be presented. In the approach, multibeam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from two single mode fiber lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W...

Lasers in periodontics.

Science.gov (United States)

Elavarasu, Sugumari; Naveen, Devisree; Thangavelu, Arthiie

2012-08-01

Laser is one of the most captivating technologies in dental practice since Theodore Maiman in 1960 invented the ruby laser. Lasers in dentistry have revolutionized several areas of treatment in the last three and a half decades of the 20(th) century. Introduced as an alternative to mechanical cutting device, laser has now become an instrument of choice in many dental applications. Evidence suggests its use in initial periodontal therapy, surgery, and more recently, its utility in salvaging implant opens up a wide range of applications. More research with better designs are a necessity before lasers can become a part of dental armamentarium. This paper gives an insight to laser in periodontics.

Laser-driven ion acceleration with hollow laser beams

International Nuclear Information System (INIS)

Brabetz, C.; Kester, O.; Busold, S.; Bagnoud, V.; Cowan, T.; Deppert, O.; Jahn, D.; Roth, M.; Schumacher, D.

2015-01-01

The laser-driven acceleration of protons from thin foils irradiated by hollow high-intensity laser beams in the regime of target normal sheath acceleration (TNSA) is reported for the first time. The use of hollow beams aims at reducing the initial emission solid angle of the TNSA source, due to a flattening of the electron sheath at the target rear side. The experiments were conducted at the PHELIX laser facility at the GSI Helmholtzzentrum für Schwerionenforschung GmbH with laser intensities in the range from 10 18  W cm −2 to 10 20  W cm −2 . We observed an average reduction of the half opening angle by (3.07±0.42)° or (13.2±2.0)% when the targets have a thickness between 12 μm and 14 μm. In addition, the highest proton energies were achieved with the hollow laser beam in comparison to the typical Gaussian focal spot

Laser-driven ion acceleration with hollow laser beams

Energy Technology Data Exchange (ETDEWEB)

Brabetz, C., E-mail: c.brabetz@gsi.de; Kester, O. [Goethe-Universität Frankfurt am Main, 60323 Frankfurt (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Busold, S.; Bagnoud, V. [GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Helmholtz-Institut Jena, 07743 Jena (Germany); Cowan, T. [Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden (Germany); Technische Universität Dresden, 01069 Dresden (Germany); Deppert, O.; Jahn, D.; Roth, M. [Technische Universität Darmstadt, 64277 Darmstadt (Germany); Schumacher, D. [GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany)

2015-01-15

The laser-driven acceleration of protons from thin foils irradiated by hollow high-intensity laser beams in the regime of target normal sheath acceleration (TNSA) is reported for the first time. The use of hollow beams aims at reducing the initial emission solid angle of the TNSA source, due to a flattening of the electron sheath at the target rear side. The experiments were conducted at the PHELIX laser facility at the GSI Helmholtzzentrum für Schwerionenforschung GmbH with laser intensities in the range from 10{sup 18} W cm{sup −2} to 10{sup 20} W cm{sup −2}. We observed an average reduction of the half opening angle by (3.07±0.42)° or (13.2±2.0)% when the targets have a thickness between 12 μm and 14 μm. In addition, the highest proton energies were achieved with the hollow laser beam in comparison to the typical Gaussian focal spot.

High-power pulsed lasers

International Nuclear Information System (INIS)

Holzrichter, J.F.

1980-01-01

The ideas that led to the successful construction and operation of large multibeam fusion lasers at the Lawrence Livermore Laboratory are reviewed. These lasers are based on the use of Nd:glass laser materials. However, most of the concepts are applicable to any laser being designed for fusion experimentation. This report is a summary of lectures given by the author at the 20th Scottish University Summer School in Physics, on Laser Plasma Interaction. This report includes basic concepts of the laser plasma system, a discussion of lasers that are useful for short-pulse, high-power operation, laser design constraints, optical diagnostics, and system organization

Siinolemise valikud : dialoog narkootikumidega / Inna Grünfeldt

Index Scriptorium Estoniae

Grünfeldt, Inna, 1961-

2008-01-01

Rene Vilbre noortefilmist "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", stsenaariumi kirjutas Ilmar Raag. Filmi režissöör põhjendab, miks valis Sass Henno romaani ekraniseerimiseks

Eesti film võistleb Karlovy Varys

Index Scriptorium Estoniae

2008-01-01

8. juulil esilinastub Karlovy Vary filmifestivalil Rene Vilbre noortefilm "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", stsenaariumi kirjutas Ilmar Raag. Film võistleb võistlusprogrammis "East of the West"

Režissöör George Lucase loodud "Tähesõjad" elasid üle külma sõja / Andres Laasik

Index Scriptorium Estoniae

Laasik, Andres, 1960-2016

2007-01-01

Mängufilmide triloogia "Tähesõjad" ("Star Wars") esimene film esilinastus 30 aastat tagasi. Filmi tähendustest läbi aja, nõukogude tsensuurist, mis ei lubanud filmi NSV Liitu. Lisa : "Fakte "Tähesõdadest"

Odna prostaja plastilinovaja skazka pro voronu / Nadezhda Guzheva

Index Scriptorium Estoniae

Guzheva, Nadezhda

2007-01-01

Kirjanik Eduard Uspenski meenutab, kuidas 26 aastat tagasi valmis NSV Liidus esimene plastiliinist nukkudega animafilm "Plastiliinist vares" ("Plastilinovaja vorona"), mille värsid tema kirjutas : režissöör Aleksandr Tatarski : helilooja Grigori Gladkov

Rapla liitus turvalise kodukandi liikumisega / Toivo Räägel

Index Scriptorium Estoniae

Räägel, Toivo, 1956-

2004-01-01

Rahvusvaheline liikumine "Turvaline kodukant" (Safe Community) haarab 80 paikkonda üle maailma ja on suunatud turvalisuse suurendamisele komplekssete meetmete abil. Rapla maakond on esimene Eestis, kes sellega liitus. Konverentsi avakõne pidas abiminister Külvar Mand

Kolm murdepunkti Eesti sisepoliitikas 1918-1934 / Ago Pajur

Index Scriptorium Estoniae

Pajur, Ago, 1962-

2008-01-01

Parlamentaarse demokraatia perioodi murdepunktidest. Esimene murdepunkt : 1920. aasta põhiseadus. Teine murdepunkt : kommunistide putšikatse. Kolmas murdepunkt : Suur depressioon. Tabelid: Erakondade esindatus Riigikogu teises, kolmandas ja neljandas koosseisus ; V Riigikogu erakondliku koosseise muutumine (kohtade arv)

Elust suurem seiklus / Laurence Lumiere

Index Scriptorium Estoniae

Lumiere, Laurence

2002-01-01

Peter Jacksoni esimene film J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" : Uus-Meremaa, Ameerika Ühendriigid 2001. Ka : Teleleht nr. 3, lk. 43

Pudemed möödunud aegade kroonikast / Marek Laane

Index Scriptorium Estoniae

Laane, Marek, 1969-

2002-01-01

Esimene Peter Jacksoni käe all valmivast kolmest filmist J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" : Uus-Meremaa, Ameerika Ühendriigid 2001

Kahe aastaga suurte sekka / Mark Buckton

Index Scriptorium Estoniae

Buckton, Mark

2006-01-01

Kaido Höövelson (maadlejanimega Baruto) on esimene eestlane, kes on jälje jätnud Jaapani iidses võitluskunstis sumos. Artikli autor on Suurbritannia Sumoühingu persident ja ajakirja Sumo Fan Magazine peatoimetaja

[Raamat] / Andra Teede

Index Scriptorium Estoniae

Teede, Andra, 1988-

2007-01-01

Tutvustus: Pervik, Aino. Paula lõpetab lasteaia / illustreerinud Piret Raud. Tallinn : Tiritamm, 2007. (Tähenärija Raamatukogu) ; Pervik, Aino. Paula esimene koolipäev / illustreerinud Piret Raud. Tallinn : Tiritamm, 2007. (Tähenärija Raamatukogu)

Maksuamet paljastas petturi postiindeksi abiga / Sirje Niitra

Index Scriptorium Estoniae

Niitra, Sirje, 1948-

2002-01-01

Ilmunud ka: Delovõje Vedomosti 30. jaan. lk. 3. Esimene riigikohtusse jõudnud Diveci materjalide põhjal algatatud kohtuasi lõppes maksuameti võiduga ja kohustab firmat IP Hulgi tasuma riigile ligi 600 000 krooni tulumaksu

Logitech tutvustas juubelitooteid / Kuldar Kullasepp

Index Scriptorium Estoniae

Kullasepp, Kuldar, 1980-

2006-01-01

Vt. ka Postimees : na russkom jazõke 25. sept., lk. 14. Arvutite lisaseadmete tootja tõi turule kaks uut arvutihiirt: MX Revolution ja VX Revolution. Esimene neist on mõeldud laua-, teine sülearvutite kasutajatele

Advanced lasers for fusion

International Nuclear Information System (INIS)

Krupke, W.F.; George, E.V.; Haas, R.A.

1979-01-01

Laser drive systems' performance requirements for fusion reactors are developed following a review of the principles of inertial confinement fusion and of the technical status of fusion research lasers (Nd:glass; CO 2 , iodine). These requirements are analyzed in the context of energy-storing laser media with respect to laser systems design issues: optical damage and breakdown, medium excitation, parasitics and superfluorescence depumping, energy extraction physics, medium optical quality, and gas flow. Three types of energy-storing laser media of potential utility are identified and singled out for detailed review: (1) Group VI atomic lasers, (2) rare earth solid state hybrid lasers, and (3) rare earth molecular vapor lasers. The use of highly-radiative laser media, particularly the rare-gas monohalide excimers, are discussed in the context of short pulse fusion applications. The concept of backward wave Raman pulse compression is considered as an attractive technique for this purpose. The basic physics and device parameters of these four laser systems are reviewed and conceptual designs for high energy laser systems are presented. Preliminary estimates for systems efficiencies are given. (Auth.)

Only lasers can be used for low level laser therapy.

Science.gov (United States)

Moskvin, Sergey Vladimirovich

2017-12-01

The question of lasers' exclusivity, as well as the degree of influence of special properties of low-intensity laser illumination (LILI), such as coherence, polarity and monochromaticity, on the effectiveness of low level laser therapy (LLLT) continues to cause arguments. The study analyzes publications from 1973 to 2016, in which laser and conventional light sources are compared, and the following conclusions are drawn. First, there are a lot of publications with incorrect comparison or unfounded statements. Secondly, other sources of light are often meant by LILI without any justification. Thirdly, all studies, in which the comparison is carried out correctly and close parameters of the impact and the model are used, have a firm conclusion that laser light is much more effective. Fourthly, it is uniquely identified that the most important parameter that determines the efficiency of lasers is monochromaticity, i.e., a much narrower spectral width than for all other light sources. Only laser light sources can be used for LLLT! © Author(s) 2017. This article is published with open access by China Medical University.

Laser Research Lab

Data.gov (United States)

Federal Laboratory Consortium — The Laser Research lab is thecenter for the development of new laser sources, nonlinear optical materials, frequency conversion processes and laser-based sensors for...

Laser Cutting of Thick Diamond Films Using Low-Power Laser

Energy Technology Data Exchange (ETDEWEB)

Park, Y.J.; Baik, Y.J. [Korea Institute of Science and Technology, Seoul (Korea)

2000-02-01

Laser cutting of thick diamond films is studied rising a low-power(10 W) copper vapor laser. Due to the existence of the saturation depth in laser cutting, thick diamond films are not easily cut by low-power lasers. In this study, we have adopted a low thermal- conductivity underlayer of alumina and a heating stage (up to 500 deg. C in air) to prevent the laser energy from consuming-out and, in turn, enhance the cutting efficiency. Aspect ratio increases twice from 3.5 to 7 when the alumina underlayer used. Adopting a heating stage also increases aspect ratio and more than 10 is obtained at higher temperatures than 400 deg. C. These results show that thick diamond films can be cut, with low-power lasers, simply by modifying the thermal property of underlayer. (author). 13 refs., 5 figs.

Laser solenoid: an alternate use of lasers in fusion power

International Nuclear Information System (INIS)

Rose, P.H.

1977-01-01

A unique laser assisted fusion approach is under development at Mathematical Sciences Northwest, Inc. (MSNW). This approach captures one of the most developed aspects of high energy laser technology, the efficient, large, scalable, pulsed electron beam initiated, electric discharge, CO 2 infrared laser. This advanced technology is then combined with the simple geometry of a linear magnetic confinement system. The laser solenoid concept will be described, current work and experimental progress will be discussed, and the technological problems of building such a system will be assessed. Finally a comparison will be made of the technology and economics for the laser solenoid and alternative fusion approaches

Organic solid-state lasers

CERN Document Server

Forget, Sébastien

2013-01-01

Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

Quantum well lasers

CERN Document Server

Zory, Jr, Peter S; Kelley, Paul

1993-01-01

This book provides the information necessary for the reader to achieve a thorough understanding of all aspects of QW lasers - from the basic mechanism of optical gain, through the current technolgoical state of the art, to the future technologies of quantum wires and quantum dots. In view of the growing importance of QW lasers, this book should be read by all those with an active interest in laser science and technology, from the advanced student to the experienced laser scientist.* The first comprehensive book-length treatment of quantum well lasers* Provides a detailed treatment

Lasers in space.

CSIR Research Space (South Africa)

Michaelis, MM

2008-04-01

Full Text Available cube, laser beam reflectors, placed on the Moon half a century ago. These early achievements will soon be followed by a plethora of experiments involving lasers in low earth orbit (LEO) or at Lagrange points. And not much later, laser communications... will stretch out as far as Mars and beyond. One important low Earth orbit (LEO) application is the removal of space debris by Earth based or LEO relayed lasers as promoted by Phipps et al.3. Another is military communication. The prominent L1 laser space...

Bleaching Dengan Teknologi Laser

OpenAIRE

Eliwaty

2008-01-01

Penulisan tentang bleaching dengan laser dimaksudkan untuk menambah wawasan serta pengetahuan dari pembaca di bidang kedokteran gigi. Macam-macam laser yang dipergunakan dalam bleaching yaitu argon, CO2 serta dioda laser. Contoh merek produk laser yaitu Blulaze, Dentcure untuk argonlaser, Novapulse untuk C02 serta Opus 5 untuk dioda laser. Laser bleaching hasilnya dapat dicapai dalam satu kunjungan saja, cepat, efisien namun biayanya relatif mahal, dapat menimbulkan burn, sensitivitas se...

Diode-pumped solid state laser. (Part V). ; Short pulse laser oscillation. Handotai laser reiki kotai laser. 5. ; Tan pulse hasshin

Energy Technology Data Exchange (ETDEWEB)

Kuwabara, M.; Bando, N. (Asahi Glass Co. Ltd., Tokyo (Japan))

1991-12-25

A semiconductor laser (LD) excited solid state laser using an LD as an excited light source is under discussion for its practical applications to measurements, processing, communications, office automation, and medical areas. This paper describes the discussions given on the short pulse transmission using AOQ switching elements in the LD excited solid state laser with a long wave length band (1.3{mu}m), which is expected of its application in the communications and measurements area. Based on a possibility of raising a measurements resolution by making the pluses in the LD excited solid state laser, and experiments were performed using Nd:YLF as a laser host. as a results, it was found that the smaller the effective mode volume V {sub eff},the smaller the pulse width, and that the ratio of number of initial inversion distribution (N{sub i}/N{sub t}), an important parameter to determine pulse widths, can be obtained from the ratio of the LD exciting light to the input power (P{sub in}/P{sub t}). 7 refs., 14 figs., 2 tabs.

Wavelength sweepable laser source

DEFF Research Database (Denmark)

2014-01-01

Wavelength sweepable laser source is disclosed, wherein the laser source is a semiconductor laser source adapted for generating laser light at a lasing wavelength. The laser source comprises a substrate, a first reflector, and a second reflector. The first and second reflector together defines...... and having a rest position, the second reflector and suspension together defining a microelectromechanical MEMS oscillator. The MEMS oscillator has a resonance frequency and is adapted for oscillating the second reflector on either side of the rest position.; The laser source further comprises electrical...... connections adapted for applying an electric field to the MEMS oscillator. Furthermore, a laser source system and a method of use of the laser source are disclosed....

Mathematical modeling of a photovoltaic-laser energy converter for iodine laser radiation

Science.gov (United States)

Walker, Gilbert H.; Heinbockel, John H.

1987-01-01

Space-based laser power systems will require converters to change laser radiation into electricity. Vertical junction photovoltaic converters are promising devices for this use. A promising laser for the laser power station is the t-C4F9I laser which emits radiation at a wavelength of 1.315 microns. This paper describes the results of mathematical modeling of a photovoltaic-laser energy converter for use with this laser. The material for this photovoltaic converter is Ga(53)In(47)As which has a bandgap energy of 0.94 eV, slightly below the energy of the laser photons (0.943 eV). Results of a study optimizing the converter parameters are presented. Calculated efficiency for a 1000 vertical junction converter is 42.5 percent at a power density of 1 x 10 to the 3d power w/sq cm.

Laser Materials and Laser Spectroscopy - A Satellite Meeting of IQEC '88

Science.gov (United States)

Wang, Zhijiang; Zhang, Zhiming

1989-03-01

The Table of Contents for the book is as follows: * Laser Materials * Laser Site Spectroscopy of Transition Metal Ions in Glass * Spectroscopy of Chromium Doped Tunable Laser Materials * Spectroscopic Properties of Nd3+ Ions in LaMgAl11O19 Crystal * Spectral Study and 2.938 μm Laser Emission of Er3+ in the Y3Al5O12 Crystal * Raman-infrared Spectra and Radiationless Relaxation of Laser Crystal NdAl3(BO3)4 * A Study on HB and FLN in BaFCl0.5Br0.5:Sm2+ at 77K * Pair-pumped Upconversion Solid State Lasers * CW Upconversion Laser Action in Neodymium and Erbium doped Solids * Ultra-high Sensitive Upconversion Fluorescence of YbF3 Doped with Trace Tm3+ and Er3+ * The Growth and Properties of NYAB and EYAB Multifunctional Crystal * Study on Fluorescence and Laser Light of Er3+ in Glass * Growth and Properties of Single Crystal Fibers for Laser Materials * A Study on the Quality of Sapphire, Ruby and Ti3+ Doped Sapphire Grown by Temperature Gradient Technique (TGT) and Czochralski Technique (CZ) * The Measurement of Output Property of Ti3+ Al2O3 Laser Crystal * An Xα Study of the Laser Crystal MgF2 : V2+ * Q-switched NAB Laser * Miniature YAG Lasers * Study of High Efficiency {LiF}:{F}^-_2 Color Center Crystals * Study on the Formation Conditions and Optical Properties of (F2+)H Color Center in NaCl:OH- Crystals * Novel Spectroscopic Properties of {LiF}:{F}^+_3 - {F}_2 Mixed Color Centers Laser Crystals * Terraced Substrate Visible GaAlAs Semiconductor Lasers with a Large Optical Cavity * The Temperature Dependence of Gain Spectra, Threshold Current and Auger Recombination in InGaAsP-InP Double Heterojunction Laser diode * Time-resolved Photoluminescence and Energy Transfer of Bound Excitons in GaP:N Crystals * Optical Limiting with Semiconductors * A Critical Review of High-efficiency Crystals for Tunable Lasers * Parametric Scattering in β - BaB2O4 Crystal Induced by Picosecond Pulses * Generation of Picosecond Pulses at 193 nm by Frequency Mixing in β - BaB2O4

Ultraviolet laser transverse profile shaping for improving x-ray free electron laser performance

International Nuclear Information System (INIS)

Li, S.; Alverson, S.; Bohler, D.; Egger, A.; Fry, A.

2017-01-01

The photocathode rf gun is one of the most critical components in x-ray free electron lasers. The drive laser strikes the photocathode surface, which emits electrons with properties that depend on the shape of the drive laser. Most free electron lasers use photocathodes with work function in the ultraviolet, a wavelength where direct laser manipulation becomes challenging. In this paper, we present a novel application of a digital micromirror device (DMD) for the 253 nm drive laser at the Linear Coherent Light Source. Laser profile shaping is accomplished through an iterative algorithm that takes into account shaping error and efficiency. Next, we use laser shaping to control the X-ray laser output via an online optimizer, which shows improvement in FEL pulse energy. Lastly, as a preparation for electron beam shaping, we use the DMD to measure the photocathode quantum efficiency across cathode surface with an averaged laser rms spot size of 59 μm. In conclusion, our experiments demonstrate promising outlook of using DMD to shape ultraviolet lasers for photocathode rf guns with various applications.

Ultraviolet laser transverse profile shaping for improving x-ray free electron laser performance

Science.gov (United States)

Li, S.; Alverson, S.; Bohler, D.; Egger, A.; Fry, A.; Gilevich, S.; Huang, Z.; Miahnahri, A.; Ratner, D.; Robinson, J.; Zhou, F.

2017-08-01

The photocathode rf gun is one of the most critical components in x-ray free electron lasers. The drive laser strikes the photocathode surface, which emits electrons with properties that depend on the shape of the drive laser. Most free electron lasers use photocathodes with work function in the ultraviolet, a wavelength where direct laser manipulation becomes challenging. In this paper, we present a novel application of a digital micromirror device (DMD) for the 253 nm drive laser at the Linear Coherent Light Source. Laser profile shaping is accomplished through an iterative algorithm that takes into account shaping error and efficiency. Next, we use laser shaping to control the X-ray laser output via an online optimizer, which shows improvement in FEL pulse energy. Lastly, as a preparation for electron beam shaping, we use the DMD to measure the photocathode quantum efficiency across cathode surface with an averaged laser rms spot size of 59 μ m . Our experiments demonstrate promising outlook of using DMD to shape ultraviolet lasers for photocathode rf guns with various applications.

Laser sampling

International Nuclear Information System (INIS)

Gorbatenko, A A; Revina, E I

2015-01-01

The review is devoted to the major advances in laser sampling. The advantages and drawbacks of the technique are considered. Specific features of combinations of laser sampling with various instrumental analytical methods, primarily inductively coupled plasma mass spectrometry, are discussed. Examples of practical implementation of hybrid methods involving laser sampling as well as corresponding analytical characteristics are presented. The bibliography includes 78 references

Studies on corrosion protection of laser hybrid welded AISI 316 by laser remelting

DEFF Research Database (Denmark)

Olsen, Flemming Ove; Ambat, Rajan; Rasmussen, A.J.

2005-01-01

laser surface melting on microstructure and corrosion behaviour of AISI 316L welds. Welding and laser treatment parameters were varied. General corrosion behaviour of the weld and laser treated surface was characterised using a gel visualization test. The local electrochemistry of the weld and laser......Unlike in autogenous laser welding, hybrid laser welding of stainless steel could introduce grain boundary carbides due to low cooling rates. Formation of grain boundary carbides leads to reduced corrosion properties. Studies have initially been carried out on hybrid laser welding and subsequent...... treated surface was investigated using a novel micro electrochemical technique with a tip resolution of ~1 mm. Results show that hybrid laser welding of 316L has increased corrosion susceptibility probably as a result of grain boundary carbide formation. However a suitable post laser treatment could...

Excimer laser decontamination

Science.gov (United States)

Sentis, Marc L.; Delaporte, Philippe C.; Marine, Wladimir; Uteza, Olivier P.

2000-04-01

The application of excimer laser ablation process to the decontamination of radioactive surfaces is discussed. This technology is very attractive because it allows to efficiently remove the contaminated particles without secondary waste production. To demonstrate the capability of such technology to efficiently decontaminate large area, we studied and developed a prototype which include a XeCl laser, an optical fiber delivery system and an ablated particles collection cell. The main physical processes taking place during UV laser ablation will be explained. The influence of laser wavelength, pulse duration and absorption coefficient of material will be discussed. Special studies have been performed to understand the processes which limit the transmission of high average power excimer laser through optical fiber, and to determine the laser conditions to optimize the value of this transmission. An in-situ spectroscopic analysis of laser ablation plasma allows the real time control of the decontamination. The results obtained for painting or metallic oxides removal from stainless steel surfaces will be presented.

Teatrisügise macho-pähklid / Margit Tõnson

Index Scriptorium Estoniae

Tõnson, Margit, 1978-

2008-01-01

Andrzej Saramonowiczi näidend "Testosteroon" Endla teatris, lavastaja Enn Keerd. Ott Aardami noortetükist "Poks", lavastaja autor Ugala teatris. Kristjan Sarve debüütlavastus "Rambo" David Morrelli romaani "Esimene veri" ainetel NO99 teatris

"Mina olin siin", võib vastu hambaid saada / Andres Keil

Index Scriptorium Estoniae

Keil, Andres, 1974-

2007-01-01

Noortefilmi "Mina olin siin" võtetel. Filmi aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", stsenaariumi kirjutas Ilmar Raag, lavastab Rene Vilbre, operaator on Mait Mäekivi, peaosas Rasmus Kaljujärv, produtsendiks Riina Sildos

Betamag.ee vahendab oma elukunsti / Anne Vetik

Index Scriptorium Estoniae

Vetik, Anne

2006-01-01

Graafilisele disainile ja popkultuurile pühendatud elektroonilisest ajakirjast Beta. Idee Liisa-Triin Vurmalt ja Jaana Davidjantsilt, kaastööd teevad Tristan Priimägi, Jass Seljamaa ja Erik Morna. Ilmumas neljas Beta, esimene veebruaris 2005

Eesti e-valmisolekut hinnati kõrgeks

Index Scriptorium Estoniae

2008-01-01

Alates 2000. aastast koostab Economisti äriinfo üksus (Economist Intelligence Unit) igal aastal riikide e-valmisoleku edetabelit. Lisatud tabel 2007. ja 2008. aasta kohta. Eesti on Ida-Euroopa riikidest esimene ja maailma lõikes 28. kohal

Bagatellid : maailm / Mailis Põld

Index Scriptorium Estoniae

Põld, Mailis

2007-01-01

Muusikasõnumeid mujalt maailmast: Tipptenor Roberto Alagna protsessib La Scalaga. Pariisis andis sooloõhtu Pierre-Laurent Aimard. Messiaeni viimase õpilase George Benjamini esimene ulatuslik teos ooperizhanris. Saadaval Glenn Gouldi klaveritoolid. Seminoli indiaanlased omandasid Hard Rock kohvikute keti

Anhaldt-Dessau vürstiriik - ideaalne kultuuripark / Tiina Tammet

Index Scriptorium Estoniae

Tammet, Tiina, 1971-

2007-01-01

Franz von Anhaldt-Dessau (1740-1817) 18. sajandil loodud Wörlitzi pargist, mis oli mandri-Euroopas esimene inglise stiilis park. Muinsuskaitse all olev kultuuripark on osa UNESCO Kesk-Elbe-Steckby-Lödderitzer Forsti biosfäärikaitsealast

"Troonide mäng" toob fantaasia usutavalt teleekraanile / Mari Rebane

Index Scriptorium Estoniae

Rebane, Mari

2011-01-01

USA telekanali HBO telesarjast "Troonide mäng", George R. R. Martini "Jää ja tule laulu" sarja esimese raamatu "Troonide mäng" teleekraniseeringust. Sarja esimene osa esilinastus USA-s 17. aprillil. Osades Sean Bean jt.

Wiener Sezession 100 : maailmast / Mirjam Peil

Index Scriptorium Estoniae

Peil, Mirjam, 1939-

1998-01-01

1987. a. Viini kunstnike poolt loodud ühingust Sezession, mis toetas sümbolistliku sõnumiga juugendkunsti. Esimene esimees ja vaimne liider oli Gustav Klimt. Sezessioni näitusehoonest, mida 1897. a. asus projekteerima Joseph Maria Olbrich

Korova Makarevitsha - samaja stojashtshaja

Index Scriptorium Estoniae

2005-01-01

Rahvusvahelisest kunstifestivalist "Cowparade" Moskvas. Projekti algatajaks on Jerome D. Elbaum. Esimene Cowparade toimus 1998. a. Zürichis. Moskva oksjonil müüdi kõige kallimalt Andrei Makarevitshi, kunstnik Tatjana Nazarenko ja skulptor Zurab Tsereteli maalitud lehmad

Uroki elfiiskogo / Nikolai Karajev

Index Scriptorium Estoniae

Karajev, Nikolai, 1978-

2002-01-01

Peter Jacksoni esimene film J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" : Uus-Meremaa, Ameerika Ühendriigid 2001. Tolkieni loodud maailmast ja selle kujutamisest filmis

Ugala kaks uuslavastust

Index Scriptorium Estoniae

2004-01-01

27. aug. jõuab publiku ette hooaja esimene uuslavastus - A. Noormetsa kirjutatud ja lavastatud "Aastapäeva pidu" Paistu rahvamajas ja 4. sept. esietendub P. Võigemasti lavastuses siberlastest vendade O. ja V. Presnjakovide näidend "Terrorism"

Voldemar Panso preemia said kaksikvennad Priit ja Märt Pius / Tiiu Laks

Index Scriptorium Estoniae

Laks, Tiiu, 1984-

2010-01-01

Lavakunstikooli 25. lennu üliõpilased Priit ja Märt Pius pälvisid Voldemar Panso nimelise preemia. Terve kursuse esimene bakalaureuselavastus "Jumala Narride Vennaskond" esietendub 4. detsembril Tallinna Linnateatri Põrgulaval. Lavastas kursuse juhendaja Elmo Nüganen

Efficient Ho:YLF laser pumped by a Tm:fiber laser

CSIR Research Space (South Africa)

Koen, W

2013-10-01

Full Text Available A thulium fiber laser pumped Ho:YLF laser delivering 45.1 W in a near diffraction limited beam when pumped with 84.7 W is demonstrated. The optical-to-optical efficiency of 53 % compares favorably with similar Ho:YAG lasers....

Laser Safety Evaluation of the MILES and Mini MILES Laser Emitting Components; TOPICAL

International Nuclear Information System (INIS)

AUGUSTONI, ARNOLD L.

2002-01-01

Laser safety evaluation and output emission measurements were performed (during October and November 2001) on SNL MILES and Mini MILES laser emitting components. The purpose, to verify that these components, not only meet the Class 1 (eye safe) laser hazard criteria of the CDRH Compliance Guide for Laser Products and 21 CFR 1040 Laser Product Performance Standard; but also meet the more stringent ANSI Std. z136.1-2000 Safe Use of Lasers conditions for Class 1 lasers that govern SNL laser operations. The results of these measurements confirmed that all of the Small Arms Laser Transmitters, as currently set (''as is''), meet the Class 1 criteria. Several of the Mini MILES Small Arms Transmitters did not. These were modified and re-tested and now meet the Class 1 laser hazard criteria. All but one System Controllers (hand held and rifle stock) met class 1 criteria for single trigger pulls and all presented Class 3a laser hazard levels if the trigger is held (continuous emission) for more than 5 seconds on a single point target. All units were Class 3a for ''aided'' viewing. These units were modified and re-tested and now meet the Class 1 hazard criteria for both ''aided'' as well as ''unaided'' viewing. All the Claymore Mine laser emitters tested are laser hazard Class 1 for both ''aided'' as well as ''unaided'' viewing

Laser ablation principles and applications

CERN Document Server

1994-01-01

Laser Ablation provides a broad picture of the current understanding of laser ablation and its many applications, from the views of key contributors to the field. Discussed are in detail the electronic processes in laser ablation of semiconductors and insulators, the post-ionization of laser-desorbed biomolecules, Fourier-transform mass spectroscopy, the interaction of laser radiation with organic polymers, laser ablation and optical surface damage, laser desorption/ablation with laser detection, and laser ablation of superconducting thin films.

CO2-laser fusion

International Nuclear Information System (INIS)

Stark, E.E. Jr.

1978-01-01

The basic concept of laser fusion is described, with a set of requirements on the laser system. Systems and applications concepts are presented and discussed. The CO 2 laser's characteristics and advantages for laser fusion are described. Finally, technological issues in the development of CO 2 laser systems for fusion applications are discussed

Laser dynamics of asynchronous rational harmonic mode-locked fiber soliton lasers

International Nuclear Information System (INIS)

Jyu, Siao-Shan; Jiang, Guo-Hao; Lai, Yinchieh

2013-01-01

Laser dynamics of asynchronous rational harmonic mode-locked (ARHM) fiber soliton lasers are investigated in detail. In particular, based on the unique laser dynamics of asynchronous mode-locking, we have developed a new method for determining the effective active modulation strength in situ for ARHM lasers. By measuring the magnitudes of the slowly oscillating pulse timing position and central frequency, the effective phase modulation strength at the multiplication frequency of rational harmonic mode-locking can be accurately inferred. The method can be a very useful tool for developing ARHM fiber lasers. (paper)

Radiological protection against lasers

Energy Technology Data Exchange (ETDEWEB)

Ballereau, P

1974-04-01

A brief description of the biological effects of laser beams is followed by a review of the factors involved in eye and skin damage (factors linked with the nature of lasers and those linked with the organ affected) and a discussion of the problems involved in the determination of threshold exposure levels. Preventive measures are recommended, according to the type of laser (high-energy pulse laser, continuous laser, gas laser). No legislation on the subject exists in France or in Europe. Types of lasers marketed, threshold exposure levels for eye and skin, variations of admissible exposure levels according to wavelength, etc. are presented in tabular form. Nomogram for determination of safe distance for direct vision of a laser is included.

Laser-tissue interaction in tattoo removal by q-switched lasers.

Science.gov (United States)

Barua, Shyamanta

2015-01-01

Q-switched (QS) lasers are widely considered the gold standard for tattoo removal, with excellent clinical results, impressive predictability, and a good safety profile. The generation of giant pulses by the method of Q-switching is responsible for the unique laser-tissue interaction that is seen in tattoo removal by QS lasers. The QS lasers work by impaction and dissolution of the tattoo pigments. Mechanical fragmentation of the tattoo pigments encased in intracellular lamellated organelles followed by their phagocytosis by macrophages is thought to be the major event in the clearance of pigments by QS lasers. A few novel techniques have been tried in recent times to hasten the clearance of tattoo pigments.

Traveling-wave laser-produced-plasma energy source for photoionization laser pumping and lasers incorporating said

Science.gov (United States)

Sher, Mark H.; Macklin, John J.; Harris, Stephen E.

1989-09-26

A traveling-wave, laser-produced-plasma, energy source used to obtain single-pass gain saturation of a photoionization pumped laser. A cylindrical lens is used to focus a pump laser beam to a long line on a target. Grooves are cut in the target to present a surface near normal to the incident beam and to reduce the area, and hence increase the intensity and efficiency, of plasma formation.

5W intracavity frequency-doubled green laser for laser projection

Science.gov (United States)

Yan, Boxia; Bi, Yong; Li, Shu; Wang, Dongdong; Wang, Dongzhou; Qi, Yan; Fang, Tao

2014-11-01

High power green laser has many applications such as high brightness laser projection and large screen laser theater. A compact and high power green-light source has been developed in diode-pumped solid-state laser based on MgO doped periodically poled LiNbO3 (MgO:PPLN). 5W fiber coupled green laser is achieved by dual path Nd:YVO4/MgO:PPLN intra-cacity frequency-doubled. Single green laser maximum power 2.8W at 532nm is obtained by a 5.5W LD pumped, MgO:PPLN dimensions is 5mm(width)×1mm(thickness)×2mm(length), and the optical to optical conversion efficiency is 51%. The second LD series connected with the one LD, the second path green laser is obtained using the same method. Then the second path light overlap with the first path by the reflection mirrors, then couple into the fiber with a focus mirror. Dual of LD, Nd:YVO4, MgO:PPLN are placed on the same heat sink using a TEC cooling, the operating temperature bandwidth is about 12°C and the stablity is 5% in 96h. A 50×50×17mm3 laser module which generated continuous-wave 5 W green light with high efficiency and width temperature range is demonstrated.

Designing of Raman laser

International Nuclear Information System (INIS)

Zidan, M. D.; Al-Awad, F.; Alsous, M. B.

2005-01-01

In this work, we describe the design of the Raman laser pumped by Frequency doubled Nd-YAG laser (λ=532 nm) to generate new laser wavelengths by shifting the frequency of the Nd-YAG laser to Stokes region (λ 1 =683 nm, λ 2 =953.6 nm, λ 3 =1579.5 nm) and Antistokes region (λ ' 1 =435 nm, λ ' 2 =369.9 nm, λ ' 3=319.8 nm). Laser resonator has been designed to increase the laser gain. It consists of two mirrors, the back mirror transmits the pump laser beam (λ=532 nm) through the Raman tube and reflects all other generated Raman laser lines. Four special front mirrors were made to be used for the four laser lines λ 1 =683 nm, λ 2 =953.6 nm and λ ' 1 = 435 nm, λ ' 2 =369.9 nm. The output energy for the lines υ 1 s, υ 2 s, υ 1 as,υ 2 as was measured. The output energy of the Raman laser was characterized for different H 2 pressure inside the tube. (Author)

Development of Cr,Nd:GSGG laser as a pumping source of Ti:sapphire laser

International Nuclear Information System (INIS)

Tamura, Koji; Arisawa, Takashi

1999-08-01

Since efficiency of Cr,Nd doped gadolinium scandium gallium garnet (GSGG) laser is in principle higher than that of Nd:YAG laser, it can be a highly efficient pumping source for Ti:sapphire laser. We have made GSGG laser, and measured its oscillation properties. It was two times more efficient than Nd:YAG laser at free running mode operation. At Q-switched mode operation, fundamental output of 50 mJ and second harmonics output of 8 mJ were obtained. The developed laser had appropriate spatial profile, temporal duration, long time stability for solid laser pumping. Ti:sapphire laser oscillation was achieved by the second harmonics of GSGG laser. (author)

Soft x-ray lasers

International Nuclear Information System (INIS)

Matthews, D.L.; Rosen, M.D.

1988-01-01

One of the elusive dreams of laser physicists has been the development of an x-ray laser. After 25 years of waiting, the x-ray laser has at last entered the scientific scene, although those now in operation are still laboratory prototypes. They produce soft x rays down to about five nanometers. X-ray lasers retain the usual characteristics of their optical counterparts: a very tight beam, spatial and temporal coherence, and extreme brightness. Present x-ray lasers are nearly 100 times brighter that the next most powerful x-ray source in the world: the electron synchrotron. Although Lawrence Livermore National Laboratory (LLNL) is widely known for its hard-x-ray laser program which has potential applications in the Strategic Defense Initiative, the soft x-ray lasers have no direct military applications. These lasers, and the scientific tools that result from their development, may one day have a place in the design and diagnosis of both laser fusion and hard x-ray lasers. The soft x-ray lasers now in operation at the LLNL have shown great promise but are still in the primitive state. Once x-ray lasers become reliable, efficient, and economical, they will have several important applications. Chief among them might be the creation of holograms of microscopic biological structures too small to be investigated with visible light. 5 figs

History and principle of lasers

International Nuclear Information System (INIS)

Townes, Ch.H.; Schwob, C.; Julien, J.; Forget, S.; Robert-Philip, I.; Balcou, Ph.

2010-01-01

In the first article C.H. Townes, the inventor of the maser, describes the work and ideas that led to the invention of the laser. The second article explains how a laser operate and the third article reviews the main different types of laser: solid lasers, gas lasers, diode lasers and dye lasers

Laser Safety and Hazard Analysis for the Trailer (B70) Based AURA Laser System

International Nuclear Information System (INIS)

AUGUSTONI, ARNOLD L.

2003-01-01

A laser safety and hazard analysis was performed for the AURA laser system based on the 2000 version of the American National Standards Institute's (ANSI) Standard Z136.1, for ''Safe Use of Lasers'' and the 2000 version of the ANSI Standard Z136.6, for ''Safe Use of Lasers Outdoors''. The trailer based AURA laser system is a mobile platform, which is used to perform laser interaction experiments and tests at various national test sites. The trailer (B70) based AURA laser system is generally operated on the United State Air Force Starfire Optical Range (SOR) at Kirtland Air Force Base (KAFB), New Mexico. The laser is used to perform laser interaction testing inside the laser trailer as well as outside the trailer at target sites located at various distances from the exit telescope. In order to protect personnel, who work inside the Nominal Hazard Zone (NHZ), from hazardous laser emission exposures it was necessary to determine the Maximum Permissible Exposure (MPE) for each laser wavelength (wavelength bands) and calculate the appropriate minimum Optical Density (OD min ) of the laser safety eyewear used by authorized personnel and the Nominal Ocular Hazard Distance (NOHD) to protect unauthorized personnel who may have violated the boundaries of the control area and enter into the laser's NHZ

On-Chip Laser-Power Delivery System for Dielectric Laser Accelerators

Science.gov (United States)

Hughes, Tyler W.; Tan, Si; Zhao, Zhexin; Sapra, Neil V.; Leedle, Kenneth J.; Deng, Huiyang; Miao, Yu; Black, Dylan S.; Solgaard, Olav; Harris, James S.; Vuckovic, Jelena; Byer, Robert L.; Fan, Shanhui; England, R. Joel; Lee, Yun Jo; Qi, Minghao

2018-05-01

We propose an on-chip optical-power delivery system for dielectric laser accelerators based on a fractal "tree-network" dielectric waveguide geometry. This system replaces experimentally demanding free-space manipulations of the driving laser beam with chip-integrated techniques based on precise nanofabrication, enabling access to orders-of-magnitude increases in the interaction length and total energy gain for these miniature accelerators. Based on computational modeling, in the relativistic regime, our laser delivery system is estimated to provide 21 keV of energy gain over an acceleration length of 192 μ m with a single laser input, corresponding to a 108-MV/m acceleration gradient. The system may achieve 1 MeV of energy gain over a distance of less than 1 cm by sequentially illuminating 49 identical structures. These findings are verified by detailed numerical simulation and modeling of the subcomponents, and we provide a discussion of the main constraints, challenges, and relevant parameters with regard to on-chip laser coupling for dielectric laser accelerators.

Laser therapy for cancer

Science.gov (United States)

... this page: //medlineplus.gov/ency/patientinstructions/000905.htm Laser therapy for cancer To use the sharing features ... Lasers are also used on the skin. How Laser Therapy is Used Laser therapy can be used ...

Lasers in Cancer Treatment

Science.gov (United States)

... the advantages of laser therapy? What are the disadvantages of laser therapy? What does the future hold ... therapy is appropriate for them. What are the disadvantages of laser therapy? Laser therapy also has several ...

Laser therapy (image)

Science.gov (United States)

A laser is used for many medical purposes. Because the laser beam is so small and precise, it enables ... without injuring surrounding tissue. Some uses of the laser are retinal surgery, excision of lesions, and cauterization ...

Mis on looming.org? : elektrooniline heli / Andres Lõo

Index Scriptorium Estoniae

Lõo, Andres

2004-01-01

Võrguajakirjast www.looming.org, kuhu kogutakse infot põhiliselt kahe jaotuse põhjal: muusika ja helieksperimentalism ning kaasaegne kunst, kunsti ja meediaga seonduv. Idee autorid: Hanno Soans ja Andres Lõo. Ilmunud on looming.orgi esimene muusikakogumik "Lilled algebrale"

Miljonär Toomas Tool sai süüdistuse börsi kuritarvitamises / Andrus Karnau

Index Scriptorium Estoniae

Karnau, Andrus

2009-01-01

Ärimees Toomas Tool ja tema tehinguid vahendanud SEB börsimaakler Karoly Kirber said süüdistuse Arco Vara aktsiatega börsil manipuleerimises. Vt. samas: Eesti esimene börsimanipulatsioon jõuab kohtu ette; Diagramm

USA salajane riigiametnike komisjon võib panna ka oma kodanikud tapanimekirja / Kaivo Kopli

Index Scriptorium Estoniae

Kopli, Kaivo

2011-01-01

Jeemenis USA droonirünnakus hukkunud Anwar al-Awlaki, keda USA valitsusesindajad nimetasid al-Qaida talendiotsijaks ja värvatute motiveerijaks, oli väidetavalt esimene USA kodanik, kes oli pandud USA vastu võitlevate terroristide nn. tapanimekirja

Tuuleenergia prognoosi täpsuse uuring / Teolan Tomson, Maire Hansen, Raimo Pirksaar

Index Scriptorium Estoniae

Tomson, Teolan, 1932-

2004-01-01

Esimene ekspluatatsioonikogemus näitas, et kohalikes oludes töötavad tuulikud (Virtsus) suhteliselt hästi. Väikesevõimsuselised tuulepargid ei mõjuta Eesti elektrivõrgu tööd, pigem vastupidi. Graafikud. Skeemid. Tabelid. Diagrammid

Semiootilisest ekspertiisist / Anti Randviir

Index Scriptorium Estoniae

Randviir, Anti, 1975-

2006-01-01

Tartu Ülikooli semiootikaosakonna vanemteadur käsitleb seoses K-kohukese ja "Kommarid ahju!" ekspertiisiga kahte aspekti: esimene puudutab semiootiku kui ametimehe ülesandeid, teine moment on semiootiku ja tavakodaniku suhted. "Kommarid ahju!" teksti analüüsist

Lithuania's first visa from 1990 on exhibit in the Vilnius airport / Rokas M. Tracevskis

Index Scriptorium Estoniae

Tracevskis, Rokas M.

2010-01-01

The Economisti ajakirjanik Edward Lucas, kellele väljastati esimene Leedu Vabariigi viisa numbriga 0001, andis selle viisaga passi Leedu välisministeeriumi muuseumile üle. 2011. aasta jooksul eksponeeritakse seda Vilniuse lennujaamas. Edward Lucase arvamusi Leedu poliitikast

Eestlased ametis Iirimaal / Silva Männik

Index Scriptorium Estoniae

Männik, Silva, 1974-

2003-01-01

Eestist Iirimaale tööle siirdunud inimeste arv kasvab. Kaks Iirimaal töötavat eestlast vahendavad oma kogemusi. Vt. samas: Esimene ešelon eestlasi lendab Kerry Foodsi septembri lõpus; Elu Iirimaal on eestlasele kallis

Vault, Arch and the Pomegranate Tree / Eva Laantee Reintamm

Index Scriptorium Estoniae

Laantee Reintamm, Eva

2007-01-01

Tallinnas Aedvilja ja Karu tänava nurgal asuvast uuest sünagoogist, projekteerija KOKO Arhitektid. 1883. aastal avati Maakri tänaval Nikolai Thamme projekteeritud Eesti esimene sünagoog (hävitati 1944). Juudi kogukonna ajaloost

Itaalia kohus mõistis 23 CIA agenti vangi islamisti röövi eest / Kaivo Kopli

Index Scriptorium Estoniae

Kopli, Kaivo

2009-01-01

Itaalia kohtu süüdimõistvast otsusest USA Luure Keskagentuuri (CIA) töötajate kohta islami äärmuslase Abu Omari ebaseadusliku vahistamise kohtuasjas, mis on esimene kohtuprotsess maailmas CIA töömeetodite üle

Tolkieni maailm elustus kinos / Ilona Martson

Index Scriptorium Estoniae

Martson, Ilona, 1970-

2001-01-01

Londonis esilinastus esimene Peter Jacksoni käe all valmivast kolmest filmist J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" : Uus-Meremaa, Ameerika Ühendriigid 2001

Venemaalase tegevus USA börsil võinuks tuua LHV-le kahjunõude / Lauri Linnamäe, Aivar Õepa

Index Scriptorium Estoniae

Linnamäe, Lauri

2006-01-01

USA väärtpaberiagentuur SEC tunnustas Eesti finantsinspektsiooni, kes tegi nendega head koostööd Venemaa kodaniku Jevgeni Gashitshevi arvete arestimisel. Diagramm: Börsipettus identiteedivarguse teel. Lisa: Pump-and-dump petuskeem. Vt. samas: LHV esimene skandaal

Juhendamine juhtimise asemel / Vahur Murutar

Index Scriptorium Estoniae

Murutar, Vahur, 1961-

2003-01-01

Rets. rmt.: Patrick J. McKenna, David H. Maister. Esimene võrdsete seas. Fontes, Pärnu Konverentsid 2003. Autor selgitab McKenna ja Maisteri raamatule tuginedes, mida eeldab maailmas üha enam populaarsust koguv juhi roll meeskonna treenerina

Tunable laser optics

CERN Document Server

Duarte, FJ

2015-01-01

This Second Edition of a bestselling book describes the optics and optical principles needed to build lasers. It also highlights the optics instrumentation necessary to characterize laser emissions and focuses on laser-based optical instrumentation. The book emphasizes practical and utilitarian aspects of relevant optics including the essential theory. This revised, expanded, and improved edition contains new material on tunable lasers and discusses relevant topics in quantum optics.

Laser cutting system

Science.gov (United States)

Dougherty, Thomas J

2015-03-03

A workpiece cutting apparatus includes a laser source, a first suction system, and a first finger configured to guide a workpiece as it moves past the laser source. The first finger includes a first end provided adjacent a point where a laser from the laser source cuts the workpiece, and the first end of the first finger includes an aperture in fluid communication with the first suction system.

Laser cooling of solids

CERN Document Server

Petrushkin, S V

2009-01-01

Laser cooling is an important emerging technology in such areas as the cooling of semiconductors. The book examines and suggests solutions for a range of problems in the development of miniature solid-state laser refrigerators, self-cooling solid-state lasers and optical echo-processors. It begins by looking at the basic theory of laser cooling before considering such topics as self-cooling of active elements of solid-state lasers, laser cooling of solid-state information media of optical echo-processors, and problems of cooling solid-state quantum processors. Laser Cooling of Solids is an important contribution to the development of compact laser-powered cryogenic refrigerators, both for the academic community and those in the microelectronics and other industries. Provides a timely review of this promising field of research and discusses the fundamentals and theory of laser cooling Particular attention is given to the physics of cooling processes and the mathematical description of these processes Reviews p...

Olympic - Eesti esimene maailmavallutaja? / Tarvo Vaarmets

Index Scriptorium Estoniae

Vaarmets, Tarvo

2008-01-01

Olympic on väga tugeva juhiga, ambitsioonikas ettevõte, mille aktsia hind on kukkunud tasemele, mida võiks pikaajaline investor tasapisi hakata võtma kui head ostukohta. Vt. samas: Tugevad näitajad sisendavad kindlust. Diagramm: Olympicu aktsia

PÖFFi esimene seeria / Erkki Luuk

Index Scriptorium Estoniae

Luuk, Erkki, 1971-

2002-01-01

Pimedate Ööde filmifestivalil näidatud filme - animafilm "Ärgas elu" ("Waking Life") : režissöör Richard Linklater : Ameerika Ühendriigid 2001, mängufilm "Kana süda" 8"Chicken Heart") : režissöör Hiroshi Shimizu : Jaapan 2002 ja Ida-Saksamaa indiaanifilm "Chingachguk - Suur Madu" ("Chinachgook - die Grosse Schlange") : režissöör Richard Groschopp : 1967, mis oli üks serblasest filminäitleja Gojko Mitic'i retrospektiivi kuulunud filmidest

Maailma esimene täispuhutav pubi

Index Scriptorium Estoniae

2007-01-01

Briti firma Airquee Ltd on toonud turule maailma esimese täispuhutava pubi. Põrandapinda on selles PVC-st valmistatud hoones üle 80 m2, hoone on 7 metrit kõrge. Pubi on projekteerinud waleslane Andi Francis. Ill.: värv. välisvaade

Eesti joonisfilm jälle esimene

Index Scriptorium Estoniae

2000-01-01

Ameerika Ühendriikide suurimal animafilmifestivalil Hollywoodis "The World Animation Celebration" sai Pärna joonisfilm "Porgandite öö" esimese preemia 15-30-minutiliste filmide kategoorias. Film on valitud koos Janno Põldma joonisfilmiga "Armastuse võimalikkusest" ja Priit Tenderi filmiga "Viola" augustis Hiroshimas toimuvale festivalile

Kunstisuvi 2008, esimene osa / Andri Ksenofontov

Index Scriptorium Estoniae

Ksenofontov, Andri, 1962-

2008-01-01

Eesti Maalikunstnike Liidu aastanäitused: Mara Koppel-Ljutjuki ja Toomas Tõnissoo kureeritud "Perfektne ring" ArtDepoo galeriis, Tiiu Talvistu ja Mare Joonsalu kureeritud "Äratus" Rotermanni soolalaos. Mart Lepa ja Rene Kuulmanni kogudest avatud näitus "Kirg ja valu" Tartu Kunstimuuseumis. Ilmar Kruusamäe näitus "30 aastat hiljem" Tampere majas. Tartu Ülikooli maaliosakonna lõputööde väljapanekud Tartu Kunstimaja monumentaalgaleriis (Eda Lõhmus), Athena keskuses (Natali Pahapill) ja Tartu Kunstimuuseumis (Maria Ader, Riho Pärn, Katrin Paomets). Vaal-galerii korraldatud rändnäitus "Sinimustvalge eesti kunstis" Tartu Kunstimajas. Ernö Kochi näitus Haus galeriis. Maret Olveti näitus Vabaduse ja SEBi galeriis. Vive Tolli juubelinäitused Tallinna Kunstihoone galeriis ja Eesti Lastekirjanduse Keskuses

Taska esimene täispikk lindil

Index Scriptorium Estoniae

2003-01-01

Lõppesid produtsent Kristian Taska uue mängufilmi "Täna öösel me ei maga" võtted. Lavastab Ilmar Taska, operaatoriks on Istvan Borbas, peaosades Carmen Kass, Peter Franzen; Maria Avdjushko, Priit Võigemast. Esilinastus tuleb 13. veebruaril 2004

Nargen Opera esimene festivalisuvi / Kersti Inno

Index Scriptorium Estoniae

Inno, Kersti, 1954-

2006-01-01

Dirigent Tõnu Kaljuste asutatud Nargen Opera avas 15. juunil Naissaarel oma esimese suure festivalisuve Veljo Tormise "Eesti naiste lauludega" (etendused 16., 17., 19-22. juunil), Nargen Festivali kontsertidest: "Merelaulud", Marko Matvere 4. juulil Viimsi mõisa õues, 8.-10. aug. Naissaarel, 14., 15. aug. Viinistu kunstimuuseumis, "Õhtud Jaan Tättega" 6., 9. juulil Reiu jõekäärus, "Vastutuulelaev" 22, 23, 26-30. juulil Naissaarel, "Õhtud Arvo Pärdiga" 3., 4. aug. Naissaarel, Joseph Haydni ooper "Üksik saar" 16., 17. aug. Viinistu kunstimuuseumis (info: www.nargenopera.ee)

Esimene ILO seminar toimus Taasiseseisvunud Baltimaades

Index Scriptorium Estoniae

1993-01-01

Rahvusvahelise Tööorganisatsiooni (International Labour Organisation, ILO) seminar Riias tööandjate organisatsioonide rollist turumajanduses. Tööstus- ja Energeetikaministeeriumi finantsosakonna juhataja Sven Kööp

Rahvarinde esimene suurvõit / Rein Ruutsoo

Index Scriptorium Estoniae

Ruutsoo, Rein, 1947-

2008-01-01

17. juuni 1988 kui poliitilise revolutsiooni algus, mis viis kommunistliku režiimi kokkukukkumiseni. 1988. aasta kronoloogiad vaadates jääb autorile mulje, et Eesti taasvabanemise sisuks oli Alo Mattiiseni laulude esitamise tähe all sinimustvalgete lehvides kulgemine ühest kooslaulmisest teise

Viienda laevastiku esimene laev / Valdemar Vilder

Index Scriptorium Estoniae

Vilder, Valdemar

2006-01-01

ajaloolane Ann Smith tutvustas oma varsti ilmuvat raamatut "The First of the Fifth Fleet" 7. augustil Thirlmere Eesti Küla hallis. Raamat kirjeldab transpordilaeva General Stuart Heintzelman pardal Austraaliasse saabunud balti pagulaste reisiteekonda ja edasist saatust

Katselendurite esimene tõus / Tarmo Teder

Index Scriptorium Estoniae

Teder, Tarmo, 1958-

2004-01-01

Filmistuudio Parunid ja Vonid stuudios realiseerub EFSi, Kultuurkapitali, TPÜ ja Parunite ja Vonide ühisprojekt "Ground Zero", mille tulemuseks on TPÜ filmi ja video õppetooli tudengite 11 lühimängufilmi

Laser physics and a review of laser applications in dentistry for children.

Science.gov (United States)

Martens, L C

2011-04-01

The aim of this introduction to this special laser issue is to describe some basic laser physics and to delineate the potential of laser-assisted dentistry in children. A brief review of the available laser literature was performed within the scope of paediatric dentistry. Attention was paid to soft tissue surgery, caries prevention and diagnosis, cavity preparation, comfort of the patient, effect on bacteria, long term pulpal vitality, endodontics in primary teeth, dental traumatology and low level laser therapy. Although there is a lack of sufficient evidence taking into account the highest standards for evidence-based dentistry, it is clear that laser application in a number of different aetiologies for soft tissue surgery in children has proven to be successful. Lasers provide a refined diagnosis of caries combined with the appropriate preventive adhesive dentistry after cavity preparation. This will further lead to a new wave of micro-dentistry based on 'filling without drilling'. It has become clear from a review of the literature that specific laser applications in paediatric dentistry have gained increasing importance. It can be concluded that children should be considered as amongst the first patients for receiving laser-assisted dentistry.

Femtosecond laser inscribed cladding waveguide lasers in Nd:LiYF4 crystals

Science.gov (United States)

Li, Shi-Ling; Huang, Ze-Ping; Ye, Yong-Kai; Wang, Hai-Long

2018-06-01

Depressed circular cladding, buried waveguides were fabricated in Nd:LiYF4 crystals with an ultrafast Yb-doped fiber master-oscillator power amplifier laser. Waveguides were optimized by varying the laser writing conditions, such as pulse energy, focus depth, femtosecond laser polarization and scanning velocity. Under optical pump at 799 nm, cladding waveguides showed continuous-wave laser oscillation at 1047 nm. Single- and multi-transverse modes waveguide laser were realized by varying the waveguide diameter. The maximum output power in the 40 μm waveguide is ∼195 mW with a slope efficiency of 34.3%. The waveguide lasers with hexagonal and cubic cladding geometry were also realized.

Advanced Laser Architecture for Two-Step Laser Tandem Mass Spectrometer

Science.gov (United States)

Fahey, Molly E.; Li, Steven X.; Yu, Anthony W.; Getty, Stephanie A.

2016-01-01

Future astrobiology missions will focus on planets with significant astrochemical or potential astrobiological features, such as small, primitive bodies and the icy moons of the outer planets that may host diverse organic compounds. These missions require advanced instrument techniques to fully and unambiguously characterize the composition of surface and dust materials. Laser desorptionionization mass spectrometry (LDMS) is an emerging instrument technology for in situ mass analysis of non-volatile sample composition. A recent Goddard LDMS advancement is the two-step laser tandem mass spectrometer (L2MS) instrument to address the need for future flight instrumentation to deconvolve complex organic signatures. The L2MS prototype uses a resonance enhanced multi-photon laser ionization mechanism to selectively detect aromatic species from a more complex sample. By neglecting the aliphatic and inorganic mineral signatures in the two-step mass spectrum, the L2MS approach can provide both mass assignments and clues to structural information for an in situ investigation of non-volatile sample composition. In this paper we will describe our development effort on a new laser architecture that is based on the previously flown Lunar Orbiter Laser Altimeter (LOLA) laser transmitter for the L2MS instrument. The laser provides two discrete midinfrared wavelengths (2.8 m and 3.4 m) using monolithic optical parametric oscillators and ultraviolet (UV) wavelength (266 nm) on a single laser bench with a straightforward development path toward flight readiness.

Laser in operative dentistry

Directory of Open Access Journals (Sweden)

E. Yasini

1994-06-01

Full Text Available Today laser has a lot of usage in medicine and dentistry. In the field of dentistry, laser is used in soft tissue surgery, sterilization of canals (in root canal therapy and in restorative dentistry laser is used for cavity preparation, caries removal, sealing the grooves (in preventive dentistry, etching enamel and dentin, composite polymerization and removal of tooth sensitivity. The use of Co2 lasers and Nd: YAG for cavity preparation, due to creating high heat causes darkness and cracks around the region of laser radiation. Also due to high temperature of these lasers, pulp damage is inevitable. So today, by using the Excimer laser especially the argon floride type with a wavelength of 193 nm, the problem of heat stress have been solved, but the use of lasers in dentistry, especially for cavity preparation needs more researches and evaluations.

Flexible Laser Metal Cutting

DEFF Research Database (Denmark)

Villumsen, Sigurd; Jørgensen, Steffen Nordahl; Kristiansen, Morten

2014-01-01

This paper describes a new flexible and fast approach to laser cutting called ROBOCUT. Combined with CAD/CAM technology, laser cutting of metal provides the flexibility to perform one-of-a-kind cutting and hereby realises mass production of customised products. Today’s laser cutting techniques...... possess, despite their wide use in industry, limitations regarding speed and geometry. Research trends point towards remote laser cutting techniques which can improve speed and geometrical freedom and hereby the competitiveness of laser cutting compared to fixed-tool-based cutting technology...... such as punching. This paper presents the concepts and preliminary test results of the ROBOCUT laser cutting technology, a technology which potentially can revolutionise laser cutting....

Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry.

Science.gov (United States)

Keeley, James; Freeman, Joshua; Bertling, Karl; Lim, Yah L; Mohandas, Reshma A; Taimre, Thomas; Li, Lianhe H; Indjin, Dragan; Rakić, Aleksandar D; Linfield, Edmund H; Davies, A Giles; Dean, Paul

2017-08-03

The effects of optical feedback (OF) in lasers have been observed since the early days of laser development. While OF can result in undesirable and unpredictable operation in laser systems, it can also cause measurable perturbations to the operating parameters, which can be harnessed for metrological purposes. In this work we exploit this 'self-mixing' effect to infer the emission spectrum of a semiconductor laser using a laser-feedback interferometer, in which the terminal voltage of the laser is used to coherently sample the reinjected field. We demonstrate this approach using a terahertz frequency quantum cascade laser operating in both single- and multiple-longitudinal mode regimes, and are able to resolve spectral features not reliably resolved using traditional Fourier transform spectroscopy. We also investigate quantitatively the frequency perturbation of individual laser modes under OF, and find excellent agreement with predictions of the excess phase equation central to the theory of lasers under OF.

Lasers in chemical processing

International Nuclear Information System (INIS)

Davis, J.I.

1982-01-01

The high cost of laser energy is the crucial issue in any potential laser-processing application. It is expensive relative to other forms of energy and to most bulk chemicals. We show those factors that have previously frustrated attempts to find commercially viable laser-induced processes for the production of materials. Having identified the general criteria to be satisfied by an economically successful laser process and shown how these imply the laser-system requirements, we present a status report on the uranium laser isotope separation (LIS) program at the Lawrence Livermore National Laboratory

Laser power supply

International Nuclear Information System (INIS)

Bernstein, D.

1975-01-01

The laser power supply includes a regulator which has a high voltage control loop based on a linear approximation of a laser tube negative resistance characteristic. The regulator has independent control loops for laser current and power supply high voltage

Lasers in endodontics: an overview

Science.gov (United States)

Frentzen, Matthias; Braun, Andreas; Koort, Hans J.

2002-06-01

The interest in endodontic use of dental laser systems is increasing. Developing laser technology and a better understanding of laser effects widened the spectrum of possible endodontic indications. Various laser systems including excimer-, argon+-, diode-, Nd:YAG-, Er:YAG- and CO2-lasers are used in pulp diagnosis, treatment of hypersensitivity, pulp capping, sterilization of root canals, root canal shaping and obturation or apicoectomy. With the development of new delivery systems - thin and flexible fibers - for many different wavelengths laser applications in endodontics may increase. Since laser devices are still relatively costly, access to them is limited. Most of the clinical applications are laser assisted procedures such as the removing of pulp remnants and debris or disinfection of infected root canals. The essential question is whether a laser can provide improved treatment over conventional care. To perform laser therapy in endodontics today different laser types with adopted wavelengths and pulse widths are needed, each specific to a particular application. Looking into the future we will need endodontic laser equipment providing optimal laser parameters for different treatment modalities. Nevertheless, the quantity of research reports from the last decade promises a genuine future for lasers in endodontics.

"Õhtuti süütasid nad kassi haual küünla..." : [luuletused] / Tomi Kontio ; soome keelest tõlkinud Jan Kaus

Index Scriptorium Estoniae

Kontio, Tomi

2007-01-01

Sisu: "Õhtuti süütasid nad kassi haual küünla..." ; "Meri on plekkis, terasest neiu seisab..." ; "Lumi puude okstel, kirmetis aknal, jää..." ; Kontula kaar ; Vastavalt tahtele ; Ühel kaardil ; Esimene lumi ; Dimensioonid ; Pieta

Mina olin siin. Kus siis täpselt? / Donald Tomberg

Index Scriptorium Estoniae

Tomberg, Donald

2008-01-01

Rene Vilbre noortefilm "Mina olin siin", mille aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", osades Rasmus Kaljujärv, Hele Kõre, Tambet Tuisk, Jaan Rekkor : Amrion Productions - Helsinki-filmi OY. Artikli lõpus R. Vilbre filmograafia

Algasid Henno "Mina olin siin" järgi tehtava filmi võtted

Index Scriptorium Estoniae

2007-01-01

Eile algasid noortefilmi "Mina olin siin" võtted. Filmi aluseks on Sass Henno romaan "Mina olin siin. Esimene arest", stsenaariumi kirjutas Ilmar Raag, lavastab Rene Vilbre, operaator on Mait Mäekivi, peaosas Rasmus Kaljujärv, produtsendiks Riina Sildos

DVD. Alar Niineväli soovitab "Tähevärav : Tõelaegas" / Alar Niineväli

Index Scriptorium Estoniae

Niineväli, Alar

2008-01-01

Esimene kahest otse DVD levisse läinud mängufilmist populaarse ulmeseriaali lõpuleviimiseks "Tähevärav: Tõelaegas" ("Stargate: The Ark of Truth") : režissöör Robert C. Cooper : Ameerika Ühendriigid - Kanada 2008

Veevärk laiendab haaret / Monika Puutsa

Index Scriptorium Estoniae

Puutsa, Monika

2005-01-01

Kuressaare Veevärk OÜ ja Veemaailm INC sõlmisid lepingu vee- ja kanalisatsioonitorustiku rajamiseks ja uuendamiseks linna 24 tänaval, mis on esimene etapp Saare maakonda hõlmavast Ühtekuuluvusfondi veemajanduse projektist. 80% ulatuses rahastab projekti EL

Kak snimali "Detei Arbata" / Anton Pavlov

Index Scriptorium Estoniae

Pavlov, Anton

2005-01-01

Venemaa Esimene Kanal näitas eelmise aasta lõpul uut seriaali Anatoli Rõbakovi romaanide "Arbati lapsed", "Hirm" ja "Põrm ja tuhk" alusel : režissöör Andrei Eshpai. A. Rõbakovi raamatutest, filmi saamisloost ja võtetest

Tallinna Tehnikaülikoolis avati mobiilrakenduste arenduskeskus

Index Scriptorium Estoniae

2001-01-01

Loodud mobiilrakenduste arenduskeskus MAI (Mobile Applications Initiative) on esimene omalaadne õppe- ja arendustöö jaoks loodud mobiilside testkeskkond Eestis. Teaduskeskus aitab hoogustada erialast teadustööd ja koolitust ning pakub mobiilrakenduste testimise võimalust ka ettevõtjatele

Aastavahetus toob ekraanile uue meelelahutussarja / Rannar Raba

Index Scriptorium Estoniae

Raba, Rannar, 1979-

2005-01-01

Vana-aasta õhtul läheb Eesti Televisioonis eetrisse esimene osa kodumaisest komöödiasarjast "Hajameelselt abielus". Stsenaristid on Gert Kiiler ja Villu Kangur. Lavastavad Üllar Saaremäe ja Tõnu Oja. Sarja tootjafirma on Umberto Productions

"Sõrmuste isand" tegi "Potterile" ära

Index Scriptorium Estoniae

2002-01-01

11. jaanuarist eesti kinodes linastuv esimene Peter Jacksoni käe all valmivast kolmest filmist J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" on kogunud 9237 vaatajat

Poola Nike 2007 / Hendrik Lindepuu

Index Scriptorium Estoniae

Lindepuu, Hendrik

2007-01-01

Poola kirjanduspreemiast Nike, 2007. aasta laureaadist (Wieslav Mysliwski "Traktaat ubade puhastamisest"), 2007. aasta lugejapreemia laureaadist (Mariusz Szczygiel "Gottland") ja nominentitest (Jerzy Pilch "Minu esimene enesetapp", Magdalena Tull "Defekt", Maria Janion "Ebatavaline slaavilikkus", Tomasz Rozyck "Kolooniad", Marcin Swietlick "Sisemine muusika")

Zvuki muzõki

Index Scriptorium Estoniae

2003-01-01

Metallica filmib uut klippi; O. Osbourne tühistas Euroopa turnee, et minna närviravile; vene rockiklassika seerias on esimene "Alissa" plaat; J. Lopezil ilmub uus maksisingel; The Who esitleb oma rock-ooperit "Tommy"; Madonnal ilmumas uued singlid

Ülemiste City maastikukujundus / Ülle Grišakov

Index Scriptorium Estoniae

Grišakov, Ülle, 1953-

2009-01-01

Esimene Tallinna erapark, ainulaadne projekt, mis kombineerib vana industriaalarhitektuuri uute hoonetega ning linnamaastiku värskete lahendustega. Säilitatud on kõrghaljastus. Projekti autorid on Olga Borisik, Triin Järve ja Ülle Grišakov OÜ Kivisilla, 2005

Parimaks veebifilmiks valiti animafilm / Verni Leivak

Index Scriptorium Estoniae

Leivak, Verni, 1966-

2008-01-01

31. jaanuaril lõppes koostöös PÖFFi, Kinobussi ja Overall Eestiga korraldatud esimene veebifilmide festival "Lae üles!" lõpuüritusega Tallinna Kinomajas. Parimaks veebifilmiks kuulutas žürii Irina Tammise animafilmi "Silver ja Viki"

Ooperipäevad Saaremaal (II) / Tiiu Levald

Index Scriptorium Estoniae

Levald, Tiiu, 1940-

2008-01-01

21.-27. VII Saaremaa ooperipäevade raames toimunud üritustest - Carmen Tabori lavastatud Aino Kallase ja Tauno Pylkkäneni "Patseba Saaremaal" (esimene osa draama- ja teine ooperilavastus), Gershwini ooperist "Porgy ja Bess" ning 25. VII toimunud galakontserdist

Cutting using the CO laser. Trennen mit dem CO-Laser

Energy Technology Data Exchange (ETDEWEB)

Maisenhaelder, F.; Stoehr, M. (DLR, Inst. fuer Technische Physik, Stuttgart (Germany))

1991-02-01

Several cutting experiments were performed to investigate the maximum cutting speed when using CO or CO{sub 2} laser radiation. The material which was used for these experiments was mild steel (St 37) and stainless steel (V2A; X5CrNi 189), the material thickness varied from 0.5 mm to 4 mm. The cutting parameters, especially the focal power density and the focal diameter, were equal for both laser wavelengths. The experimental result shows an increased cutting speed with CO laser beams in comparison to CO{sub 2} laser beams.

Laser marking method and device

International Nuclear Information System (INIS)

Okazaki, Yuki; Aoki, Nobutada; Mukai, Narihiko; Sano, Yuji; Yamamoto, Seiji.

1997-01-01

An object is disposed in laser beam permeating liquid or gaseous medium. Laser beams such as CW laser or pulse laser oscillated from a laser device are emitted to the object to apply laser markings with less degradation of identification and excellent corrosion resistance on the surface of the object simply and easily. Upon applying the laser markings, a liquid or gas as a laser beam permeating medium is blown onto the surface of the object, or the liquid or gas in the vicinity of the object is sucked, the laser beam-irradiated portion on the surface can be cooled positively. Accordingly, the laser marking can be formed on the surface of the object with less heat affection to the object. In addition, if the content of a nitrogen gas in the laser beam permeating liquid medium is reduced by degassing to lower than a predetermined value, or the laser beam permeating gaseous medium is formed by an inert gas, a laser marking having high corrosion resistance and reliability can be formed on the surface of the objective member. (N.H.)

Kas keegi vajab neid raamatuid? / Jaanika Palm

Index Scriptorium Estoniae

Palm, Jaanika, 1973-

2001-01-01

Rets. rmt. : Müürsepp, Mare. Kolm põrsakest. Punamütsike : muinasjutu-kirjavihik 5-aastastele lastele. 1 vihik / jutustanud, luuletanud ja ülesanded välja mõelnud Mare Müürsepp. Tallinn : Ilo, 2000. Sari "Muinasjutt õpetab" : Hans ja Grete / [idee: Nicole Lenaerts-Viroux. Tallinn] : Egmont Estonia, 2001; Hunt ja seitse kitsetalle / [idee: Nicole Lenaerts-Viroux. Tallinn] : Egmont Estonia, 2000; Lumivalgeke ja seitse pöialpoissi / [idee: Nicole Lenaerts-Viroux. Tallinn] : Egmont Estonia, 2001; Pöial-Liisi / [idee: Nicole Lenaerts-Viroux. Tallinn] : Egmont Estonia, 2000

CO laser angioplasty system: efficacy of manipulatable laser angioscope catheter

Science.gov (United States)

Arai, Tsunenori; Kikuchi, Makoto; Mizuno, Kyoichi; Sakurada, Masami; Miyamoto, Akira; Arakawa, Koh; Kurita, Akira; Nakamura, Haruo; Takeuchi, Kiyoshi; Utsumi, Atsushi; Akai, Yoshiro

1992-08-01

A percutaneous transluminal coronary angioplasty system using a unique combination of CO laser (5 micrometers ) and As-S infrared glass fiber under the guidance of a manipulatable laser angioscope catheter is described. The ablation and guidance functions of this system are evaluated. The angioplasty treatment procedure under angioscope guidance was studied by in vitro model experiment and in vivo animal experiment. The whole angioplasty system is newly developed. That is, a transportable compact medical CO laser device which can emit up to 10 W, a 5 F manipulatable laser angioscope catheter, a thin CO laser cable of which the diameter is 0.6 mm, an angioscope imaging system for laser ablation guidance, and a system controller were developed. Anesthetized adult mongrel dogs (n equals 5) with an artificial complete occlusion in the femoral artery and an artificial human vessel model including occluded or stenotic coronary artery were used. The manipulatability of the catheter was drastically improved (both rotation and bending), therefore, precise control of ablation to expand stenosis was obtained. A 90% artificial stenosis made of human yellow plaque in 4.0 mm diameter in the vessel was expanded to 70% stenosis by repetitive CO laser ablations of which total energy was 220 J. All procedures were performed and controlled under angioscope visualization.

Laser welding engineering

International Nuclear Information System (INIS)

Bhieh, N. M.; El Eesawi, M. E.; Hashkel, A. E.

2007-01-01

Laser welding was in its early life used mainly for unusual applications where no other welding process would be suitable that was twenty five years ago. Today, laser welding is a fully developed part of the metal working industry, routinely producing welds for common items such as cigarette lighters, which springs, motor/transformer lamination, hermetic seals, battery and pacemaker cans and hybrid circuit packages. Yet very few manufacturing engineering have seriously considers employing lasers in their own operations. Why? There are many reasons, but a main one must be not acquainted with the operation and capabilities of a laser system. Other reasons, such as a relatively high initial cost and a concern about using lasers in the manufacturing environment, also are frequently cited, and the complexity of the component and flexibility of the light delivery system. Laser welding could be used in place of many different standard processes, such as resistance (spot or seam), submerged arc, RF induction, high-frequency resistance, ultrasonic and electronic and electron-beam. while each of these techniques has established an independent function in the manufacturing world, the flexible laser welding approach will operate efficiently and economically in many different applications. Its flexibility will even permit the welding system to be used for other machining function, such as drilling, scribing, sealing and serializing. In this article, we will look at how laser welding works and what benefits it can offer to manufacturing engineers. Some industry observers state that there are already 2,000 laser machine tools being used for cutting, welding and drilling and that the number could reach 30,000 over the next 15 years as manufacturing engineers become more aware of the capabilities of lasers [1). While most laser applications are dedicated to one product or process that involves high-volume, long-run manufacturing, the flexibility of a laser to supply energy to hard

Teradiode's high brightness semiconductor lasers

Science.gov (United States)

Huang, Robin K.; Chann, Bien; Burgess, James; Lochman, Bryan; Zhou, Wang; Cruz, Mike; Cook, Rob; Dugmore, Dan; Shattuck, Jeff; Tayebati, Parviz

2016-03-01

TeraDiode is manufacturing multi-kW-class ultra-high brightness fiber-coupled direct diode lasers for industrial applications. A fiber-coupled direct diode laser with a power level of 4,680 W from a 100 μm core diameter, BPP) of 3.5 mm-mrad and is the lowest BPP multi-kW-class direct diode laser yet reported. This laser is suitable for industrial materials processing applications, including sheet metal cutting and welding. This 4-kW fiber-coupled direct diode laser has comparable brightness to that of industrial fiber lasers and CO2 lasers, and is over 10x brighter than state-of-the-art direct diode lasers. We have also demonstrated novel high peak power lasers and high brightness Mid-Infrared Lasers.

Color speckle in laser displays

Science.gov (United States)

Kuroda, Kazuo

2015-07-01

At the beginning of this century, lighting technology has been shifted from discharge lamps, fluorescent lamps and electric bulbs to solid-state lighting. Current solid-state lighting is based on the light emitting diodes (LED) technology, but the laser lighting technology is developing rapidly, such as, laser cinema projectors, laser TVs, laser head-up displays, laser head mounted displays, and laser headlamps for motor vehicles. One of the main issues of laser displays is the reduction of speckle noise1). For the monochromatic laser light, speckle is random interference pattern on the image plane (retina for human observer). For laser displays, RGB (red-green-blue) lasers form speckle patterns independently, which results in random distribution of chromaticity, called color speckle2).

Recent laser experiments on the Aurora KrF/ICF laser system

International Nuclear Information System (INIS)

Turner, T.P.; Jones, J.E.; Czuchlewski, S.J.; Watt, R.G.; Thomas, S.J.; Kang, M.; Tallman, C.R.; Mack, J.M.; Figueira, J.F.

1990-01-01

The Aurora KrF/ICF Laser Facility at Los Alamos is operational at the kilojoule-level for both laser and target experiments. We report on recent laser experiments on the system and resulting system improvements. 3 refs., 4 figs

Laser for fusion energy

International Nuclear Information System (INIS)

Holzrichter, J.F.

1995-01-01

Solid state lasers have proven to be very versatile tools for the study and demonstration of inertial confinement fusion principles. When lasers were first contemplated to be used for the compression of fusion fuel in the late 1950s, the laser output energy levels were nominally one joule and the power levels were 10 3 watts (pulse duration's of 10 -3 sec). During the last 25 years, lasers optimized for fusion research have been increased in power to typically 100,000 joules with power levels approaching 10 14 watts. As a result of experiments with such lasers at many locations, DT target performance has been shown to be consistent with high gain target output. However, the demonstration of ignition and gain requires laser energies of several megajoules. Laser technology improvements demonstrated over the past decade appear to make possible the construction of such multimegajoule lasers at affordable costs. (author)

Laser Processing and Chemistry

CERN Document Server

Bäuerle, Dieter

2011-01-01

This book gives an overview of the fundamentals and applications of laser-matter interactions, in particular with regard to laser material processing. Special attention is given to laser-induced physical and chemical processes at gas-solid, liquid-solid, and solid-solid interfaces. Starting with the background physics, the book proceeds to examine applications of lasers in “standard” laser machining and laser chemical processing (LCP), including the patterning, coating, and modification of material surfaces. This fourth edition has been enlarged to cover the rapid advances in the understanding of the dynamics of materials under the action of ultrashort laser pulses, and to include a number of new topics, in particular the increasing importance of lasers in various different fields of surface functionalizations and nanotechnology. In two additional chapters, recent developments in biotechnology, medicine, art conservation and restoration are summarized. Graduate students, physicists, chemists, engineers, a...

Laser applications for energy. Fifty years since advent of laser and next thirty years

International Nuclear Information System (INIS)

Nakai, Sadao

2011-01-01

The utilization of light has been changed since the advent of lasers about fifty years ago. Now in the twenty first century, laser science is being applied in every industry as the fundamental technology. In the recent years, remarkable progresses have been made in the semiconductor lasers of high power and wide wavelength region. The amazing developments of ceramics laser materials like YAG and nonlinear optics materials of organic crystals have been achieved as well as the big progress in the fiber lasers. It is also to be pointed out that very high power ultra short laser pulses have become available. In the field of power photonics, which is based on the power semiconductor lasers, fiber lasers and new laser materials, various industrial applications are expected to be constructed further in civil engineering, manufacturing technology, agricultural and biological applications, medical utilization and space sciences. It is expected, by the development of ultra short pulse and ultra high mean power lasers, that particle accelerations, ultra high density sciences, nuclear fusion neutron sources and laser fusion power reactors are to be advanced drastically. Recent development and future prospects of high power lasers are illustrated. Lasers are now regarded as one of the key technologies in line with the national policy toward the creation of innovative industries. Realization of the laser fusion reactor is the most challenging target in the coming thirty years. (S. Funahashi)

Disk laser: a new generation of industrial lasers

Science.gov (United States)

Brockmann, Rüdiger; Havrilla, David

2009-02-01

The disk laser concept aggregates high efficiency, excellent beam quality, high average and peak power with moderate cost and high reliability. Therefore it became one major technology in industrial laser material processing. In several large scale installations in the automotive industry, high power cw- systems make already use of the high brightness and high efficiency of disk lasers, e.g. in remote welding [1,2]. Other applications including cutting, drilling, deep welding and hybrid welding are arising. This report highlights the latest results in cw disk laser development. A 1.5 kW source with a beam parameter product (BPP) of 2 mm mrad is described as well as the demonstration of a 14 kW system out of three disks with a BPP of 8 mm mrad. The future prospects regarding increased power and even further improved productivity and economics are presented. A new industrial disk laser series with output powers up to 16 kW and a beam parameter product of 8 mm*mrad will enable both, new applications in the thick sheet area and very cost efficient high productive applications like welding and cutting of thin sheets.

Laser development for laser fusion applications. Research progress report, October 1979-September 1980

International Nuclear Information System (INIS)

1981-04-01

Research conducted during this period is reported on the following: (1) rare-gas-halogen lasers, (2) XeCl laser at excitation rates of 1.7 to 4.7 MW/cm 3 , (3) rare gas halogen laser modeling, (4) three-body ion recombination coefficients, (5) electron beam accelerators, (6) power conditioning studies for accelerators, (7) chemically pumped iodine lasers, (8) hydrogen fluoride lasers, and (9) supporting research

A low-cost, tunable laser lock without laser frequency modulation

Science.gov (United States)

Shea, Margaret E.; Baker, Paul M.; Gauthier, Daniel J.

2015-05-01

Many experiments in optical physics require laser frequency stabilization. This can be achieved by locking to an atomic reference using saturated absorption spectroscopy. Often, the laser frequency is modulated and phase sensitive detection used. This method, while well-proven and robust, relies on expensive components, can introduce an undesirable frequency modulation into the laser, and is not easily frequency tuned. Here, we report a simple locking scheme similar to those implemented previously. We modulate the atomic resonances in a saturated absorption setup with an AC magnetic field created by a single solenoid. The same coil applies a DC field that allows tuning of the lock point. We use an auto-balanced detector to make our scheme more robust against laser power fluctuations and stray magnetic fields. The coil, its driver, and the detector are home-built with simple, cheap components. Our technique is low-cost, simple to setup, tunable, introduces no laser frequency modulation, and only requires one laser. We gratefully acknowledge the financial support of the NSF through Grant # PHY-1206040.

CO2 laser pulse shortening by laser ablation of a metal target

International Nuclear Information System (INIS)

Donnelly, T.; Mazoyer, M.; Lynch, A.; O'Sullivan, G.; O'Reilly, F.; Dunne, P.; Cummins, T.

2012-01-01

A repeatable and flexible technique for pulse shortening of laser pulses has been applied to transversely excited atmospheric (TEA) CO 2 laser pulses. The technique involves focusing the laser output onto a highly reflective metal target so that plasma is formed, which then operates as a shutter due to strong laser absorption and scattering. Precise control of the focused laser intensity allows for timing of the shutter so that different temporal portions of the pulse can be reflected from the target surface before plasma formation occurs. This type of shutter enables one to reduce the pulse duration down to ∼2 ns and to remove the low power, long duration tails that are present in TEA CO 2 pulses. The transmitted energy is reduced as the pulse duration is decreased but the reflected power is ∼10 MW for all pulse durations. A simple laser heating model verifies that the pulse shortening depends directly on the plasma formation time, which in turn is dependent on the applied laser intensity. It is envisaged that this plasma shutter will be used as a tool for pulse shaping in the search for laser pulse conditions to optimize conversion efficiency from laser energy to useable extreme ultraviolet (EUV) radiation for EUV source development.

Laser safety tools and training

CERN Document Server

Barat, Ken

2008-01-01

Lasers perform many unique functions in a plethora of applications, but there are many inherent risks with this continually burgeoning technology. Laser Safety: Tools and Training presents simple, effective ways for users in a variety of facilities to evaluate the hazards of any laser procedure and ensure they are following documented laser safety standards.Designed for use as either a stand-alone volume or a supplement to Laser Safety Management, this text includes fundamental laser and laser safety information and critical laser use information rarely found in a single source. The first lase

Injection-controlled laser resonator

Science.gov (United States)

Chang, J.J.

1995-07-18

A new injection-controlled laser resonator incorporates self-filtering and self-imaging characteristics with an efficient injection scheme. A low-divergence laser signal is injected into the resonator, which enables the injection signal to be converted to the desired resonator modes before the main laser pulse starts. This injection technique and resonator design enable the laser cavity to improve the quality of the injection signal through self-filtering before the main laser pulse starts. The self-imaging property of the present resonator reduces the cavity induced diffraction effects and, in turn, improves the laser beam quality. 5 figs.

High power laser research and development at the Laboratory for Laser Energetics

International Nuclear Information System (INIS)

Soures, J.M.; McCrory, R.L.; Cerqua, K.A.

1986-01-01

As part of its research mission - to investigate the interaction of intense radiation with matter - the Laboratory for Laser Energetics (LLE) of the University of Rochester is developing a number of high-peak power and high-average-power laser systems. In this paper we highlight some of the LLE work on solid-state laser research, development and applications. Specifically, we discuss the performance and operating characteristics of Omega, a twenty-four beam, 4000 Joule, Nd:glass laser system which is frequently tripled using the polarization mismatch scheme. We also discuss progress in efforts to develop high-average-power solid-state laser systems with active-mirror and slab geometries and to implement liquid-crystal devices in high-power Nd:glass lasers. Finally we present results from a program to develop a compact, ultrahigh-peak-power solid-state laser using the concept of frequency chirped pulse amplification

Verification of a characterization method of the laser-induced selective activation based on industrial lasers

DEFF Research Database (Denmark)

Zhang, Yang; Hansen, Hans Nørgaard; Tang, Peter T.

2013-01-01

In this article, laser-induced selective activation (LISA) for subsequent autocatalytic copper plating is performed by several types of industrial scale lasers, including a Nd:YAG laser, a UV laser, a fiber laser, a green laser, and a short pulsed laser. Based on analysis of all the laser......-machined surfaces, normalized bearing area curves and parameters are used to characterize the surface quantitatively. The range of normalized bearing area curve parameters for plate-able surface is suggested. PBT/PET with 40 % glass fiber was used as the substrate material. For all of the studied lasers......, the parameters were varied in a relatively large range, and matrixes of the laser-machined surface were obtained. The topography of those laser-machined surfaces was examined by scanning electronic microscope (SEM). For each sample examined by SEM, there was an identical workpiece plated by for 90 min...

Siff võitleb Lasnamäe karjääriehitusõiguse pärast / Krista Taim

Index Scriptorium Estoniae

Taim, Krista

2006-01-01

Ilmunud ka: Delovõje Vedomosti 16. aug. lk. 7. Transiidiärimees Endel Sifi firma OÜ Primos taotlusest tühistada Tallinna linnavalitsuse korraldatud konkurss endise Lasnamäe paekarjääri arendamiseks. Vt. samas: Merko esimene katse luhtus

Somaalia piraadid ei taha Saksamaale minna / Evelyn Kaldoja

Index Scriptorium Estoniae

Kaldoja, Evelyn, 1980-

2010-01-01

Saksa kaubalaeva Taipan kaaperdamiselt tabatud somaallased ei taha, et neid antaks välja Saksamaale. Siiani on suurem osa tabatud Somaalia piraatidest saadetud Kenya kohtutesse. Rotterdamis algab järgmisel nädalal üle mitme sajandi esimene Euroopa piraadiprotsess

Hyundai uude turusektorisse

Index Scriptorium Estoniae

1999-01-01

Hyundai Santa Fe Detroidi autonäituselt on esimene Hyundai märgi all valmistamisele tulev sport- ja tarbesõiduki eellane. Santa Fe töötasid välja korea insenerid Ulsanis ja ameerika disainerid firma Californias asuvas arenduskeskuses

Alfred Chandler viis äriajaloo massidesse / Harli Uljas

Index Scriptorium Estoniae

Uljas, Harli

2007-01-01

Majandusteadlane Alfred Chandler oli esimene, kes tõi kasutusse väite, et muutused strateegias saavad olla edukad vaid juhul, kui juhid suunavad ka ettevõtte toimima uutmoodi. Teda peetakse suurkorporatsiooni äriajaloo leiutajaks. Artikkel sisaldab loetelu A. Chandleri kirjutistest

From town to heritage conservation area / Lilian Hansar

Index Scriptorium Estoniae

Hansar, Lilian, 1949-

2010-01-01

Linnaehituslike struktuuride muutused Eesti väikelinnades 13.-20. sajandil. Esimene vanalinna kaitsetsoon moodustati Eestis 1966. a. Tallinnas, 1973. a. võeti riikliku kaitse alla Lihula, Haapsalu, Kuressaare, Paide, Pärnu, Rakvere, Tartu, Viljandi, Võru ja 1995. a. Valga ajalooline keskus

Maailmas edukas ja koduselt armas Eesti aastal 2018 / Ott Pärna

Index Scriptorium Estoniae

Pärna, Ott, 1976-

2010-01-01

Eesti seisab küsimuste ees, kuhu ja kuidas edasi. Arengufond on algatanud diskussiooni teemal "Eesti kasvuvisioon 2018", selleks aastaks peavad olema tehtud olulised muutused. Arengufoorumil "Maailmas edukas ja koduselt armas Eesti" tehakse esimene avalik ajurünnak visiooni poole

Uskumatu, kuid tõsi! Londoni allmaaraudtee / Aili Pedusaar, Heino Pedusaar

Index Scriptorium Estoniae

Pedusaar, Aili

1999-01-01

Londoni allmaaraudtee rajamisest. Seaduslik teostamisluba anti 1854. asutatud Metropolitan Company projektile. Pidulik proovisõit toimus 9. I 1863. Maailma esimene elektri-allmaaraudtee läks käiku 4. X 1890. B. Karger-Deckeri raamatu "Wunderwerke von Menchenhand"(Leipzig, 1963) aineil

Archaeological Pilot Study of the Gallows Hill in Tartu / Martin Malve, Anu Kivirüüt, Raido Roog ... [jt.

Index Scriptorium Estoniae

2013-01-01

Esimene teade Tartu võllamäest pärineb 1558. aastast. Võllas oli kasutusel 18. sajandi keskpaigani, hiljem asus samas paigas tuuleveski. Eeluuringute käigus ei paljandunud ühtegi konstruktsiooni ega leidu, mis kindlalt viitaks kesk- ja varauusaegsele hukkamispaigale

Sisustusmess Pariisis "Maison &Objet 2007" / Elen Mets

Index Scriptorium Estoniae

Mets, Elen

2007-01-01

Uusi trende Pariisi messilt, kus silma hakkavad esimene internetti ühendatud jänes Nabaztag, Marcel Wandersi disainitud dünaamilised seinakleepsud, Valerie Boy asuurse metallkattega Quadra-valgusti, Richard Hutteni suurekõrvalised lastekruusid, Marine Peyre'i loodud alumiiniumist lilletoru jt.

Berliinis räägiti NordStreami venimisest / Raavo Raadik

Index Scriptorium Estoniae

Raadik, Raavo

2008-01-01

Financial Times Deutschland (FTD) ajakirjanikud vahendasid Vene gaasikontserni Gazprom juhatuse liikme Valeri Jassevi kinnitusi, et gaasijuhtme esimene osa peaks valmima 2011. aastal ja 2012. aastal peaks algama esimesed gaasitarned. Seni oli NordStream lähtunud varasematest tähtaegadest

Sõrmuse uus retk / Ivar Laus

Index Scriptorium Estoniae

Laus, Ivar

2002-01-01

Peter Jacksoni esimene film J.R.R. Tolkieni triloogia "Sõrmuste isand" alusel - "Sõrmuse vennaskond", "The Lord of the Rings : The Fellowship of the Ring" : Uus-Meremaa, Ameerika Ühendriigid 2001. Erinev elamus DVD vaatamisest kinoekraanil nähtuga võrreldes

Alar Kivilo väntab Hollywoodis spordifilmi / Tiit Tuumalu

Index Scriptorium Estoniae

Tuumalu, Tiit, 1971-

2009-01-01

Eestlasest Ameerika filmiakadeemia liige filmioperaator Alar Kivilo alustas tööd John Lee Hancocki mängufilmiga "Kaitseta külg" ("The Blind Side"). Juunis esilinastub USAs tema operaatoritööga Harold Ramis'e "Esimene aasta" ("Year One")

Dependence of Parameters of Laser-Produced Au Plasmas on the Incident Laser Energy of Sub-Nanosecond and Picosecond Laser Pulses

International Nuclear Information System (INIS)

Woryna, E.; Badziak, J.; Makowski, J.; Parys, P.; Vankov, A.B.; Wolowski, J.; Krasa, J.; Laska, L.; Rohlena, K.

2001-01-01

The parameters of Au plasma as functions of laser energy for ps pulses are presented and compared with the ones for sub-ns pulses at nearly the same densities of laser energy. The experiments were performed at the IPPLM with the use of CPA (chirped pulse amplification) Nd:glass laser system. Thick Au foil targets were irradiated by normally incident focused laser beams with maximum intensities of 8x10 16 and 2x10 14 W/cm 2 for ps and sub-ns laser pulses, respectively. The characteristics of ion streams were investigated with the use of ion diagnostics methods based on the time-of flight technique. In these experiments the laser energies were changed in the range from 90 to 700 mJ and the measurements were performed at a given focus position FP = 0 and along the target normal for both the laser pulses. The charge carried by the ions, the maximum ion velocities of fast and thermal ion groups, the maximum ion current density as well as the area of photopeak in dependence on the incident laser energy for sub-ns and ps pulses were investigated and discussed. (author)

Active-passively mode-locked dye laser for diagnosis of laser-produced plasmas

International Nuclear Information System (INIS)

Teng, Y.L.; Fedosejevs, R.; Sigel, R.

1981-03-01

In this report an active-passively mode-locked, flashlamp-pumped dye laser for diagnosis of laser-produced plasmas is described. This dye laser system used as a pulsed light source for high-speed photography of laser-target experiments was synchronized to the ASTERIX III iodine laser pulse with better than 100 ps accuracy. The single pulse energy was 10 μJ, pulse duration less than 10 ps. In 111 shots clear shadowgrams were obtained during a total of 151 target shots, i.e. the system worked well in 74% of the shots. (orig.)

Solar pumped laser

Science.gov (United States)

Lee, J. H.; Hohl, F.; Weaver, W. R. (Inventor)

1984-01-01

A solar pumped laser is described in which the lasant is a gas that will photodissociate and lase when subjected to sunrays. Sunrays are collected and directed onto the gas lasant to cause it to lase. Applications to laser propulsion and laser power transmission are discussed.

Diode lasers optimized in brightness for fiber laser pumping

Science.gov (United States)

Kelemen, M.; Gilly, J.; Friedmann, P.; Hilzensauer, S.; Ogrodowski, L.; Kissel, H.; Biesenbach, J.

2018-02-01

In diode laser applications for fiber laser pumping and fiber-coupled direct diode laser systems high brightness becomes essential in the last years. Fiber coupled modules benefit from continuous improvements of high-power diode lasers on chip level regarding output power, efficiency and beam characteristics resulting in record highbrightness values and increased pump power. To gain high brightness not only output power must be increased, but also near field widths and far field angles have to be below a certain value for higher power levels because brightness is proportional to output power divided by beam quality. While fast axis far fields typically show a current independent behaviour, for broadarea lasers far-fields in the slow axis suffer from a strong current and temperature dependence, limiting the brightness and therefore their use in fibre coupled modules. These limitations can be overcome by carefully optimizing chip temperature, thermal lensing and lateral mode structure by epitaxial and lateral resonator designs and processing. We present our latest results for InGaAs/AlGaAs broad-area single emitters with resonator lengths of 4mm emitting at 976nm and illustrate the improvements in beam quality over the last years. By optimizing the diode laser design a record value of the brightness for broad-area lasers with 4mm resonator length of 126 MW/cm2sr has been demonstrated with a maximum wall-plug efficiency of more than 70%. From these design also pump modules based on 9 mini-bars consisting of 5 emitters each have been realized with 360W pump power.

Longitudinally excited CO2 laser with multiple laser tubes

Science.gov (United States)

Uno, Kazuyuki; Akitsu, Tetsuya; Jitsuno, Takahisa

2016-11-01

We developed a longitudinally excited CO2 laser system that was constituted of two or three laser tubes and a single driving circuit. The multiple laser tubes simultaneously produced almost the same short laser pulses with a spike pulse width of about 164 ns and a pulse tail length of about 74 μs with a single driving circuit. The double-tube system was constituted of two 30 cm-long laser tubes with inner diameters of 13 mm and 16 mm and a single driving circuit with an input energy of 2.18 J. The output energy of the 13 mm-tube was 23.3 mJ, and that of the 16 mm-tube was 21.9 mJ at a gas pressure of 4.2 kPa (CO2:N2:He = 1:1:2). The triple-tube system was constituted of three 30 cm-long laser tubes with inner diameters of 9 mm, 13 mm, and 16 mm and a single driving circuit with an input energy of 2.18 J. The output energy of the 9 mm tube was 15.9 mJ, that of the 13 mm tube was 24.1 mJ, and that of the 16 mm tube was 19.2 mJ at a gas pressure of 4.2 kPa. With the same driving circuit and the same input energy, the total output energies of the multitube laser systems were higher than the output energy of a single-tube system.

Technology of discharge and laser resonators for high power CO2 lasers. Koshutsuryoku CO2 laser ni tsukawareru hoden reiki laser kyoshinki gijutsu

Energy Technology Data Exchange (ETDEWEB)

Takenaka, Y.; Kuzumoto, M. (Mitsubishi Electric Corp., Tokyo (Japan))

1994-03-20

This paper describes discharge excitation technology and resonator technology as basic technologies for high power CO2 lasers. As a result of progress in high-frequency power element techniques, the discharge excitation technology now generally uses laser excitation using AC discharge of capacity coupling type. Its representative example is silent discharge (SD) excitation. This is a system to excite laser by applying high voltages with as high frequency as 100 kHz to 1 MHz across a pair of electrodes covered with a dielectric material. The system maintains stability in discharge even if power supply voltage amplitude is modulated, and easily provides pulse outputs. Discharge excitation for diffusion cooled type CO2 laser generates a discharge in a gap with a gap length of about 2 mm, and can perform gas cooling by means of thermal conduction of gas, whereas a compact resonator can be fabricated. A resonator for the diffusion cooled type CO2 laser eliminates gas circulation and cooling systems, hence the device can be made more compact. A report has been given that several of these compact resonators were combined, from which a laser output of 85W was obtained by using RF discharge of 2kW. 43 refs., 21 figs.

Nuclear-pumped lasers

CERN Document Server

Prelas, Mark

2016-01-01

This book focuses on Nuclear-Pumped Laser (NPL) technology and provides the reader with a fundamental understanding of NPLs, a review of research in the field, and exploration of large scale NPL system design and applications. Early chapters look at the fundamental properties of lasers, nuclear-pumping and nuclear reactions that may be used as drivers for nuclear-pumped lasers. The book goes on to explore the efficient transport of energy from the ionizing radiation to the laser medium and then the operational characteristics of existing nuclear-pumped lasers. Models based on Mathematica, explanations and a tutorial all assist the reader’s understanding of this technology. Later chapters consider the integration of the various systems involved in NPLs and the ways in which they can be used, including beyond the military agenda. As readers will discover, there are significant humanitarian applications for high energy/power lasers, such as deflecting asteroids, space propulsion, power transmission and mining....

Atomic iodine laser

International Nuclear Information System (INIS)

Fisk, G.A.; Gusinow, M.A.; Hays, A.K.; Padrick, T.D.; Palmer, R.E.; Rice, J.K.; Truby, F.K.; Riley, M.E.

1978-05-01

The atomic iodine photodissociation laser has been under intensive study for a number of years. The physics associated with this system is now well understood and it is possible to produce a 0.1 nsec (or longer) near-diffraction-limited laser pulse which can be amplified with negligible temporal distortion and little spatial deformation. The output of either a saturated or unsaturated amplifier consists of a high-fidelity near-diffraction-limited, energetic laser pulse. The report is divided into three chapters. Chapter 1 is a survey of the important areas affecting efficient laser operation and summarizes the findings of Chap. 2. Chapter 2 presents detailed discussions and evaluations pertinent to pumps, chemical regeneration, and other elements in the overall laser system. Chapter 3 briefly discusses those areas that require further work and the nature of the work required to complete the full-scale evaluation of the applicability of the iodine photodissociation laser to the inertial confinement program

Principles of Lasers

CERN Document Server

Svelto, Orazio

2010-01-01

This new Fifth Edition of Principles of Lasers incorporates corrections to the previous edition. The text’s essential mission remains the same: to provide a wide-ranging yet unified description of laser behavior, physics, technology, and current applications. Dr. Svelto emphasizes the physical rather than the mathematical aspects of lasers, and presents the subject in the simplest terms compatible with a correct physical understanding. Praise for earlier editions: "Professor Svelto is himself a longtime laser pioneer and his text shows the breadth of his broad acquaintance with all aspects of the field … Anyone mastering the contents of this book will be well prepared to understand advanced treatises and research papers in laser science and technology." (Arthur L. Schawlow, 1981 Nobel Laureate in Physics) "Already well established as a self-contained introduction to the physics and technology of lasers … Professor Svelto’s book, in this lucid translation by David Hanna, can be strongly recommended for...

Improvements of the ruby laser oscillator system for laser scattering

International Nuclear Information System (INIS)

Yamauchi, Toshihiko; Kumagai, Katsuaki; Kawakami, Tomohide; Matoba, Tohru; Funahashi, Akimasa

1978-10-01

A ruby laser oscillator system is used to measure electron temperatures of the Tokamak plasmas(JFT-2 and JFT-2a). Improvements have been made of the laser oscillator to obtain the correct values. Described are the improvements and the damages of a ruby rod and a KD*P crystal for Q-switching by laser beam. Improvement are the linear Xe lamp replaced by a helical Xe lamp and in the electrical circuit for Q-switching. The damage of an optical component by a laser beam should be clarified from the damage data; the cause is not found yet. (author)

Direct pumping of ultrashort Ti:sapphire lasers by a frequency doubled diode laser

DEFF Research Database (Denmark)

Müller, André; Jensen, Ole Bjarlin; Unterhuber, Angelika

2011-01-01

electro-optical efficiency of the diode laser. Autocorrelation measurements show that pulse widths of less than 20 fs can be expected with an average power of 52 mW when using our laser. These results indicate the high potential of direct diode laser pumped Ti: sapphire lasers to be used in applications....... When using our diode laser system, the optical conversion efficiencies from green to near-infrared light reduces to 75 % of the values achieved with the commercial pump laser. Despite this reduction the overall efficiency of the Ti: sapphire laser is still increased by a factor > 2 due to the superior...... like retinal optical coherence tomography (OCT) or pumping of photonic crystal fibers for CARS (coherent anti-stokes Raman spectroscopy) microscopy....

Laser-induced stresses versus mechanical stress power measurements during laser ablation of solids

International Nuclear Information System (INIS)

Shannon, M.A.; Russo, R.E.

1995-01-01

Laser-induced stresses resulting from high-power laser-material interactions have been studied extensively. However, the rate of change in mechanical energy, or stress power, due to laser-induced stresses has only recently been investigated. An unanswered question for monitoring laser-material interactions in the far-field is whether stress power differs from stresses measured, particularly with respect to laser-energy coupling to a solid target. This letter shows experimental acoustic data which demonstrate that stress power measured in the far field of the target shows changes in laser-energy coupling, whereas the stresses measured do not. For the ambient medium above the target, stress power and stress together reflect changes in laser-energy coupling. copyright 1995 American Institute of Physics

Determinants of holmium:yttrium-aluminum-garnet laser time and energy during ureteroscopic laser lithotripsy.

Science.gov (United States)

Molina, Wilson R; Marchini, Giovanni S; Pompeo, Alexandre; Sehrt, David; Kim, Fernando J; Monga, Manoj

2014-04-01

To evaluate the association of preoperative noncontrast computed tomography stone characteristics, laser settings, and stone composition with cumulative holmium:yttrium-aluminum-garnet (Ho:YAG) laser time/energy. We retrospectively reviewed patients who underwent semirigid/flexible ureteroscopy and Ho:YAG laser lithotripsy (200 or 365 μm laser fiber; 0.8-1.0 J energy; and 8-10 Hz rate) at 2 tertiary care centers (April 2010-May 2012). Studied parameters were as follows: patient's characteristics; stone characteristics (location, burden, hardness, and composition); total laser time and energy; and surgical outcomes. One hundred patients met our inclusion criteria. Mean stone size was 1.01 ± 0.42 cm and volume 0.33 ± 0.04 cm(3). Mean stone radiodensity was 990 ± 296 HU, and Hounsfield units density 13.8 ± 6.0 HU/mm. All patients were considered stone free. Stone size and volume had a significant positive correlation with laser energy (R = 0.516, P R = 0.621, P R = 0.477, P R = 0.567, P stone size, only the correlation between HU and laser time was significant (R = 0.262, P = .011). In the multivariate analysis, with exception of stone composition (P = .103), all parameters significantly increased laser energy (R(2) = 0.524). Multivariate analysis revealed a positive significant association of laser time with stone volume (P R(2) = 0.512). In multivariate analysis for laser energy, only calcium phosphate stones required less energy to fragment compared with uric acid stones. No significant differences were found in the multivariate laser time model. Ho:YAG laser cumulative energy and total time are significantly affected by stone dimensions, hardness location, fiber size, and power. Kidney location, laser fiber size, and laser power have more influence on the final laser energy than on the total laser time. Calcium phosphate stones require less laser energy to fragment. Copyright © 2014 Elsevier Inc. All rights reserved.

Lasers: principles, applications and energetic measures

International Nuclear Information System (INIS)

Subran, C.; Sagaut, J.; Lapointe, S.

2009-01-01

After having recalled the principles of a laser and the properties of the laser beam, the authors describe the following different types of lasers: solid state lasers, fiber lasers, semiconductor lasers, dye lasers and gas lasers. Then, their applications are given. Very high energy lasers can reproduce the phenomenon of nuclear fusion of hydrogen atoms. (O.M.)

Laser performance upgrade for precise ICF experiment in SG-Ⅲ laser facility

Directory of Open Access Journals (Sweden)

Wanguo Zheng

2017-09-01

Full Text Available The SG-Ⅲ laser facility (SG-Ⅲ is the largest laser driver for inertial confinement fusion (ICF researches in China, which has 48 beamlines and can deliver 180 kJ ultraviolet laser energy in 3 ns. In order to meet the requirements of precise physics experiments, some new functionalities need to be added to SG-Ⅲ and some intrinsic laser performances need upgrade. So at the end of SG-Ⅲ's engineering construction, the 2-year laser performance upgrade project started. This paper will introduce the newly added functionalities and the latest laser performance of SG-Ⅲ. With these function extensions and performance upgrade, SG-Ⅲ is now fully prepared for precise ICF experiments and solidly paves the way towards fusion ignition.

Stabilizing laser energy density on a target during pulsed laser deposition of thin films

Science.gov (United States)

Dowden, Paul C.; Jia, Quanxi

2016-05-31

A process for stabilizing laser energy density on a target surface during pulsed laser deposition of thin films controls the focused laser spot on the target. The process involves imaging an image-aperture positioned in the beamline. This eliminates changes in the beam dimensions of the laser. A continuously variable attenuator located in between the output of the laser and the imaged image-aperture adjusts the energy to a desired level by running the laser in a "constant voltage" mode. The process provides reproducibility and controllability for deposition of electronic thin films by pulsed laser deposition.

Laser transmitter system

International Nuclear Information System (INIS)

Dye, R.A.

1975-01-01

A laser transmitter system is disclosed which utilizes mechanical energy for generating an output pulse. The laser system includes a current developing device such as a piezoelectric crystal which charges a storage device such as a capacitor in response to a mechanical input signal. The capacitor is coupled to a switching device, such as a silicon controlled rectifier (SCR). The switching device is coupled to a laser transmitter such as a GaAs laser diode, which provides an output signal in response to the capacitor being discharged

Regenerative similariton laser

Directory of Open Access Journals (Sweden)

Thibault North

2016-05-01

Full Text Available Self-pulsating lasers based on cascaded reshaping and reamplification (2R are capable of initiating ultrashort pulses despite the accumulation of large amounts of nonlinearities in all-fiber resonators. The spectral properties of pulses in self-similar propagation are compatible with cascaded 2R regeneration by offset filtering, making parabolic pulses suitable for the design of a laser of this recently introduced class. A new type of regenerative laser giving birth to similaritons is numerically investigated and shows that this laser is the analog of regenerative sources based solely on self-phase modulation and offset filtering. The regenerative similariton laser does not suffer from instabilities due to excessive nonlinearities and enables ultrashort pulse generation in a simple cavity configuration.

1.8kW laser diode pumped YAG laser; Shutsuryoku 1.8kW no handotai laser reiki YAG laser

Energy Technology Data Exchange (ETDEWEB)

NONE

1999-03-01

Toshiba Corporation, as a participant in Ministry of International Trade and Industry`s `photon measurement and processing technology project` since August, 1997, is engaged in the development of an energy-efficient LD (laser diode) pumped semiconductor YAG (yttrium-aluminum-garnet) laser device to be used for welding and cutting. It is a 5-year project and the goal is a mean output of 10kW and efficiency of 20%. In this article, a simulation program is developed which carries out calculation about element technology items such as the tracking of the beam from the pumping LD and the excitation distribution, temperature distribution, thermal stress distribution, etc., in the YAG rod. An oscillator is constructed, based on the results of the simulation, and it exhibits a world-high class continuous laser performance of a 1.8kW output and 13% efficiency. The record of 13% efficiency is five times higher than that achieved by the conventional lamp-driven YAG laser device. (translated by NEDO)

High temperature semiconductor diode laser pumps for high energy laser applications

Science.gov (United States)

Campbell, Jenna; Semenic, Tadej; Guinn, Keith; Leisher, Paul O.; Bhunia, Avijit; Mashanovitch, Milan; Renner, Daniel

2018-02-01

Existing thermal management technologies for diode laser pumps place a significant load on the size, weight and power consumption of High Power Solid State and Fiber Laser systems, thus making current laser systems very large, heavy, and inefficient in many important practical applications. To mitigate this thermal management burden, it is desirable for diode pumps to operate efficiently at high heat sink temperatures. In this work, we have developed a scalable cooling architecture, based on jet-impingement technology with industrial coolant, for efficient cooling of diode laser bars. We have demonstrated 60% electrical-to-optical efficiency from a 9xx nm two-bar laser stack operating with propylene-glycolwater coolant, at 50 °C coolant temperature. To our knowledge, this is the highest efficiency achieved from a diode stack using 50 °C industrial fluid coolant. The output power is greater than 100 W per bar. Stacks with additional laser bars are currently in development, as this cooler architecture is scalable to a 1 kW system. This work will enable compact and robust fiber-coupled diode pump modules for high energy laser applications.

Laser Plasma Instability Experiments with KrF Lasers

National Research Council Canada - National Science Library

Weaver, J. L; Oh, J; Afeyan, B; Phillips, L; Seely, J; Feldman, U; Brown, C; Karasik, , M; Serlin, V; Aglitskiy, Y; Mostovych, A. N

2007-01-01

...) with a rep-rate system that has a per pulse laser energy well below 1 megajoule. Measurements of LPI using the Nike KrF laser are presented at and above intensities needed for the FTF (Ĩ2x1015 W/cm2...

Laser cladding with powder

NARCIS (Netherlands)

Schneider, M.F.; Schneider, Marcel Fredrik

1998-01-01

This thesis is directed to laser cladding with powder and a CO2 laser as heat source. The laser beam intensity profile turned out to be an important pa6 Summary rameter in laser cladding. A numerical model was developed that allows the prediction of the surface temperature distribution that is

Visible Solid State Lasers

NARCIS (Netherlands)

Hikmet, R.A.M.

2007-01-01

Diode lasers can be found in various applications most notably in optical communication and optical storage. Visible lasers were until recently were all based on IR diode lasers. Using GaN, directly blue and violet emitting lasers have also been introduced to the market mainly in the area of optical

Development of laser technology in Research Center of Laser Fusion

International Nuclear Information System (INIS)

Zheng Wanguo; Deng Ying; Zhou Wei

2013-01-01

This paper reviews the progress in the construction of SG-Ⅲ laser facility, integrated Testbed and XG-Ⅲ laser facility and that in the upgrade of the prototype of SG-Ⅲ, and the development in assembling and installing technology, and the achievements in maintaining cleanliness project and metrology in Laser Fusion Research Center, China Academy of Engineering Physics in China in 2012. (authors)

Laser systems configured to output a spectrally-consolidated laser beam and related methods

Science.gov (United States)

Koplow, Jeffrey P [San Ramon, CA

2012-01-10

A laser apparatus includes a plurality of pumps each of which is configured to emit a corresponding pump laser beam having a unique peak wavelength. The laser apparatus includes a spectral beam combiner configured to combine the corresponding pump laser beams into a substantially spatially-coherent pump laser beam having a pump spectrum that includes the unique peak wavelengths, and first and second selectively reflective elements spaced from each other to define a lasing cavity including a lasing medium therein. The lasing medium generates a plurality of gain spectra responsive to absorbing the pump laser beam. Each gain spectrum corresponds to a respective one of the unique peak wavelengths of the substantially spatially-coherent pump laser beam and partially overlaps with all other ones of the gain spectra. The reflective elements are configured to promote emission of a laser beam from the lasing medium with a peak wavelength common to each gain spectrum.

Raha lastele! Ühe kodanikualgatuse lugu / Katrin Väljataga

Index Scriptorium Estoniae

Väljataga, Katrin

2011-01-01

Üks Tallinnas elav ema nõudis sotsiaalvõrgustikus Facebook Tallinna TV raha andmist lasteaedadele, kuna oli linna 2011. aasta esimese lisaeelarve investeeringute tabelit vaadates avastanud, et Tallinna TV saab 2011. aastal rohkem raha kui Tallinna lasteaiad (vastavalt 1,9 miljonit ja 127 823 eurot). Lasteaiade olukorrast. MTÜ Kodaniku Hääl esindajad on kohtunud mitmete ametnikega

Kõigile lastele võrdne sünnitoetus / Margi Ein

Index Scriptorium Estoniae

Ein, Margi, 1950-

2005-01-01

Peretoetuste seaduse muutmise seaduse eelnõust, mille järgi sünnitoetus ja lapsendamistoetus tõusevad 5000 kroonini lapse kohta. Sama ka Koit 26. nov. 2005, lk. 6 ; vali Uudised 7. dets. 2005, lk. 2 ; Meie Maa 7. dets. 2005, lk. 2

Jens Haug keelab oma lastel majandust õppida / Piret Reiljan

Index Scriptorium Estoniae

Reiljan, Piret, 1983-

2006-01-01

Endine ärimees Jens Haug õpib ülikoolis semiootikat ja töötab majandus- ja kommunikatsiooniministeeriumis kriisireguleerimise osakonnas. Vt. samas: Kolleeg hindab Jens Haugi teravat mõistust; Karjäär

Laser ablation of UHMWPE-polyethylene by 438 nm high energy pulsed laser

Energy Technology Data Exchange (ETDEWEB)

Torrisi, L.; Gammino, S.; Mezzasalma, A.M.; Visco, A.M.; Badziak, J.; Parys, P.; Wolowski, J.; Woryna, E.; Krasa, J.; Laska, L.; Pfeifer, M.; Rohlena, K.; Boody, F.P

2004-04-15

Pulsed laser ablation of ultra-high-molecular-weight-polyethylene (UHMWPE) is investigated at Prague Asterix Laser System (PALS) Laboratory. The high ablation yield as a function of laser energy is presented at 438 nm laser wavelength. The mechanisms of the polymer ablation are studied on the base of ''in situ'' analysis, such as mass quadrupole spectrometry and time-of-flight measurements, and ''ex situ'' analysis, such as SEM investigations and Raman spectroscopy. Results show that the laser irradiation induces a strong polymer dehydrogenation and molecular emission due to different C{sub x}H{sub y} groups having high kinetic energy and high charge state. At a laser pulse energy of 150 J the H{sup +}, C{sup n+} ions (n=1 to 6) are emitted from the plasma with velocities of the order of 10{sup 8} cm/s, while the C{sub x}H{sub y} groups and the carbon clusters, detected up to C{sub 16}, have a velocity about one or two order magnitude lower. The laser ablation process produces a deep crater in the polymer, which depth depends on the laser pulse energy and it is of the order of 500 {mu}m. The crater volume increases with the laser pulse energy. Results demonstrated that the laser radiation modifies the polymer chains because dehydrogenated material and carbon-like structures are detected in the crater walls and in the bottom of the crater, respectively. A comparison of the experimental results with the data available in literature is presented and discussed.

Double pulse laser ablation and plasma: Laser induced breakdown spectroscopy signal enhancement

International Nuclear Information System (INIS)

Babushok, V.I.; DeLucia, F.C.; Gottfried, J.L.; Munson, C.A.; Miziolek, A.W.

2006-01-01

A review of recent results of the studies of double laser pulse plasma and ablation for laser induced breakdown spectroscopy applications is presented. The double pulse laser induced breakdown spectroscopy configuration was suggested with the aim of overcoming the sensitivity shortcomings of the conventional single pulse laser induced breakdown spectroscopy technique. Several configurations have been suggested for the realization of the double pulse laser induced breakdown spectroscopy technique: collinear, orthogonal pre-spark, orthogonal pre-heating and dual pulse crossed beam modes. In addition, combinations of laser pulses with different wavelengths, different energies and durations were studied, thus providing flexibility in the choice of wavelength, pulse width, energy and pulse sequence. The double pulse laser induced breakdown spectroscopy approach provides a significant enhancement in the intensity of laser induced breakdown spectroscopy emission lines up to two orders of magnitude greater than a conventional single pulse laser induced breakdown spectroscopy. The double pulse technique leads to a better coupling of the laser beam with the plasma plume and target material, thus providing a more temporally effective energy delivery to the plasma and target. The experimental results demonstrate that the maximum effect is obtained at some optimum separation delay time between pulses. The optimum value of the interpulse delay depends on several factors, such as the target material, the energy level of excited states responsible for the emission, and the type of enhancement process considered. Depending on the specified parameter, the enhancement effects were observed on different time scales ranging from the picosecond time level (e.g., ion yield, ablation mass) up to the hundred microsecond level (e.g., increased emission intensity for laser induced breakdown spectroscopy of submerged metal target in water). Several suggestions have been proposed to explain

Laser safety and practice

International Nuclear Information System (INIS)

Low, K.S.

1995-01-01

Lasers are finding increasing routine applications in many areas of science, medicine and industry. Though laser radiation is non-ionizing in nature, the usage of high power lasers requires specific safety procedures. This paper briefly outlines the properties of laser beams and various safety procedures necessary in their handling and usage. (author)

Laser Applications in Orthodontics

Science.gov (United States)

Heidari, Somayeh; Torkan, Sepideh

2013-01-01

A laser is a collimated single wavelength of light which delivers a concentrated source of energy. Soon after different types of lasers were invented, investigators began to examine the effects of different wavelengths of laser energy on oral tissues, routine dental procedures and experimental applications. Orthodontists, along with other specialist in different fields of dentistry, can now benefit from several different advantages that lasers provide during the treatment process, from the beginning of the treatment, when separators are placed, to the time of resin residues removal from the tooth surface at the end of orthodontic treatment. This article outlines some of the most common usages of laser beam in orthodontics and also provides a comparison between laser and other conventional method that were the standard of care prior to the advent of laser in this field. PMID:25606324

Lasers in materials science

CERN Document Server

Ossi, Paolo; Zhigilei, Leonid

2014-01-01

This book covers various aspects of lasers in materials science, including a comprehensive overview on basic principles of laser-materials interactions and applications enabled by pulsed laser systems.  The material is organized in a coherent way, providing the reader with a harmonic architecture. While systematically covering the major current and emerging areas of lasers processing applications, the Volume provides examples of targeted modification of material properties achieved through careful control of the processing conditions and laser irradiation parameters. Special emphasis is placed on specific strategies aimed at nanoscale control of material structure and properties to match the stringent requirements of modern applications.  Laser fabrication of novel nanomaterials, which expands to the domains of photonics, photovoltaics, sensing, and biomedical applications, is also discussed in the Volume. This book assembles chapters based on lectures delivered at the Venice International School on Lasers...

Laser-powered lunar base

International Nuclear Information System (INIS)

Costen, R.; Humes, D.H.; Walker, G.H.; Williams, M.D.; Deyoung, R.J.

1989-01-01

The objective was to compare a nuclear reactor-driven Sterling engine lunar base power source to a laser-to-electric converter with orbiting laser power station, each providing 1 MW of electricity to the lunar base. The comparison was made on the basis of total mass required in low-Earth-orbit for each system. This total mass includes transportation mass required to place systems in low-lunar orbit or on the lunar surface. The nuclear reactor with Sterling engines is considered the reference mission for lunar base power and is described first. The details of the laser-to-electric converter and mass are discussed. The next two solar-driven high-power laser concepts, the diode array laser or the iodine laser system, are discussed with associated masses in low-lunar-orbit. Finally, the payoff for laser-power beaming is summarized

Fast-electron-relaxation measurement for laser-solid interaction at relativistic laser intensities

International Nuclear Information System (INIS)

Chen, H.; Shepherd, R.; Chung, H. K.; Kemp, A.; Hansen, S. B.; Wilks, S. C.; Ping, Y.; Widmann, K.; Fournier, K. B.; Beiersdorfer, P.; Dyer, G.; Faenov, A.; Pikuz, T.

2007-01-01

We present measurements of the fast-electron-relaxation time in short-pulse (0.5 ps) laser-solid interactions for laser intensities of 10 17 , 10 18 , and 10 19 W/cm 2 , using a picosecond time-resolved x-ray spectrometer and a time-integrated electron spectrometer. We find that the laser coupling to hot electrons increases as the laser intensity becomes relativistic, and that the thermalization of fast electrons occurs over time scales on the order of 10 ps at all laser intensities. The experimental data are analyzed using a combination of models that include Kα generation, collisional coupling, and plasma expansion

Research of time fiducial and imaging VISAR laser for Shenguang-III laser facility

Science.gov (United States)

Zhang, Rui; Wang, Zhenguo; Tian, Xiaocheng; Zhou, Dandan; Zhu, Na; Wang, Jianjun; Li, Mingzhong; Xu, Dangpeng; Dang, Zhao; Hu, Dongxia; Zhu, Qihua; Zheng, Wanguo; Wang, Feng

2015-10-01

Time fiducial laser is an important tool for the precise measurement in high energy density physics experiments. The VISAR probe laser is also vital for shock wave diagnostics in ICF experiments. Here, time fiducial laser and VISAR light were generated from one source on SG-III laser facility. After generated from a 1064-nm DFB laser, the laser is modulated by an amplitude modulator driven by 10 GS/s arbitrary waveform generator. Using time division multiplexing technology, the ten-pulse time fiducial laser and the 20-ns VISAR pulse were split by a 1×2 multiplexer and then chosen by two acoustic optic modulators. Using the technique, cost of the system was reduced. The technologies adopted in the system also include pulse polarization stabilization, high precision fiber coupling and energy transmission. The time fiducial laser generated synchronized 12-beam 2ω and 4-beam 3ω laser, providing important reference marks for different detectors and making it convenient for the analysis of diagnostic data. After being amplified by fiber amplifiers and Nd:YAG rod amplifiers, the VISAR laser pulse was frequency-converted to 532-nm pulse by a thermally controlled LBO crystal with final output energy larger than 20 mJ. Finally, the green light was coupled into a 1-mm core diameter, multimode fused silica optical fiber and propagated to the imaging VISAR. The VISAR laser has been used in the VISAR diagnostic physics experiments. Shock wave loading and slowdown processes were measured. Function to measure velocity history of shock wave front movement in different kinds of materials was added to the SG-III laser facility.

Laser antisepsis of Phorphyromonas gingivalis in vitro with dental lasers

Science.gov (United States)

Harris, David M.

2004-05-01

It has been shown that both pulsed Nd:YAG (1064nm) and continuous diode (810nm) dental lasers kill pathogenic bacteria (laser antisepsis), but a quantitative method for determining clinical dosimetry does not exist. The purpose of this study was to develop a method to quantify the efficacy of ablation of Porphyromonas gingivalis (Pg) in vitro for two different lasers. The ablation thresholds for the two lasers were compared in the following manner. The energy density was measured as a function of distance from the output of the fiber-optic delivery system. Pg cultures were grown on blood agar plates under standard anaerobic conditions. Blood agar provides an approximation of gingival tissue for the wavelengths tested in having hemoglobin as a primary absorber. Single pulses (Nd:YAG: 100- Œs diode: 100-msec) of laser energy were delivered to Pg colonies and the energy density was increased until the appearance of a small plume was observed coincident with a laser pulse. The energy density at this point defines the ablation threshold. Ablation thresholds to a single pulse were determined for both Pg and for blood agar alone. The large difference in ablation thresholds between the pigmented pathogen and the host matrix for pulsed-Nd:YAG represented a significant therapeutic ratio and Pg was ablated without visible effect on the blood agar. Near threshold the 810-nm diode laser destroyed both the pathogen and the gel. Clinically, the pulsed Nd:YAG may selectively destroy pigmented pathogens leaving the surrounding tissue intact. The 810-nm diode laser may not demonstrate this selectivity due to its longer pulse length and greater absorption by hemoglobin.

Latest development of laser cutting

OpenAIRE

Wetzig, Andreas; Herwig, Patrick; Hauptmann, Jan; Goppold, Cindy; Baumann, Robert; Fürst, Andreas; Rose, Michael; Pinder, Thomas; Mahrle, Achim; Beyer, Eckhard

2016-01-01

Laser cutting was one of the first applications of laser material processing. Today, laser cutting is the most widespread application among laser material processing besides laser marking. Meanwhile, nearly each material can be cut by means of a laser, in particular since ultra short pulse lasers are available in the power range of up to 100 W. The to be cut material can come with thicknesses from a few microns till tens of millimeters as flat stock or as free form shapes. The paper will conc...

High power lasers

CERN Document Server

Niku-Lari, A

1989-01-01

The use of lasers for the working and treatment of materials is becoming increasingly common in industry. However, certain laser applications, for example, in welding, cutting and drilling, are more widely exploited than others. Whilst the potential of lasers for the surface treatment of metals is well recognised, in practice, this particular application is a relative newcomer. The 24 papers in this volume present the latest research and engineering developments in the use of lasers for processes such as surface melting, surface alloying and cladding, and machining, as well as discussing th

Performance of a 200-J KrF laser amplifier for laser fusion research

International Nuclear Information System (INIS)

Owadano, Y.; Okuda, I.; Tanimoto, M.; Kasai, T.; Matsumoto, Y.; Yaoita, A.; Nemoto, F.; Komeiji, S.; Yano, M.

1986-01-01

An e-beam-pumped KrF laser has been developed as a middle-stage amplifier of a 1-kJ system for laser fusion research. The laser consists of one Marx generator (1MV, 11kJ), two PFLs (4.6 Ω, 100ns) with laser triggered output switches, two e-beam diodes (10 X 60 cm/sup 2/), and a laser cell (20- X 20- X 60-cm/sup 3/ active volume). Two e-beams are injected into the cell through carbon-sprayed Kapton anode and pressure foils. Up to now, a 120-J (70-ns) laser pulse has been generated with a 90% output coupling flat-flat resonator at 80% voltage operation. Overall efficiency is 1.5% in this case. A series of experiments has been performed with the laser to measure gain characteristics of a Kr-rich mixture, which is predicted to be more efficient than a normal Ar mixture in a high-laser-intensity region (>10 MW cm/sup -2/). An injection-locked oscillator mode was used to obtain a well-defined high-intensity laser beam, and a saturated intracavity intensity was measured

Fluorescence-pumped photolytic gas laser system for a commercial laser fusion power plant

International Nuclear Information System (INIS)

Monsler, M.J.

1977-01-01

The first results are given for the conceptual design of a short-wavelength gas laser system suitable for use as a driver (high average power ignition source) for a commercial laser fusion power plant. A comparison of projected overall system efficiencies of photolytically excited oxygen, sulfur, selenium and iodine lasers is described, using a unique windowless laser cavity geometry which will allow scaling of single amplifier modules to 125 kJ per aperture for 1 ns pulses. On the basis of highest projected overall efficiency, a selenium laser is chosen for a conceptual power plant fusion laser system. This laser operates on the 489 nm transauroral transition of selenium, excited by photolytic dissociation of COSe by ultraviolet fluorescence radiation. Power balances and relative costs for optics, electrical power conditioning and flow conditioning of both the laser and fluorescer gas streams are discussed for a system with the following characteristics: 8 operating modules, 2 standby modules, 125 kJ per module, 1.4 pulses per second, 1.4 MW total average power. The technical issues of scaling visible and near-infrared photolytic gas laser systems to this size are discussed

Laser lipolysis: skin tightening in lipoplasty using a diode laser.

Science.gov (United States)

Wolfenson, Moisés; Hochman, Bernardo; Ferreira, Lydia Massako

2015-05-01

New devices have been developed for surgical repair of deformities caused by localized fat deposits associated with skin laxity. The use of these devices requires the adoption of safety parameters. The aim of this study was to investigate skin tightening by laser lipolysis, using a dual-wavelength diode laser. This prospective, cross-sectional study was conducted between June of 2008 and July of 2010 with 41 consecutive patients who underwent laser lipolysis to correct contour deformities. Laser lipolysis was performed with a diode laser operating at two wavelengths (924 and 975 nm) controlled independently, and using three different tip lengths, allowing treatment of small, medium, and large areas of adipose tissue. The procedure was performed under local anesthesia in a surgical setting. To calculate the optimal cumulative energy, a total energy dose of 5 kJ/10 × 10-cm skin area was used as a safety parameter to prevent treatment complications. The circumferences of body regions were measured preoperatively, immediately after surgery, and 90 days later. Measurements were compared using the Wilcoxon test at a significance level of 0.05 (p Laser lipolysis results in progressive skin tightening over time. Therapeutic, IV.

Theoretical and experimental aspects of laser cutting with a direct diode laser

Science.gov (United States)

Costa Rodrigues, G.; Pencinovsky, J.; Cuypers, M.; Duflou, J. R.

2014-10-01

Recent developments in beam coupling techniques have made it possible to scale up the power of diode lasers with a laser beam quality suitable for laser cutting of metal sheets. In this paper a prototype of a Direct Diode Laser (DDL) source (BPP of 22 mm-mrad) is analyzed in terms of efficiency and cut performance and compared with two established technologies, CO2 and fiber lasers. An analytical model based on absorption calculations is used to predict the performance of the studied laser source with a good agreement with experimental results. Furthermore results of fusion cutting of stainless steel and aluminium alloys as well as oxygen cutting of structural steel are presented, demonstrating that industrial relevant cutting speeds with high cutting quality can now be achieved with DDL.

Note: Digital laser frequency auto-locking for inter-satellite laser ranging.

Science.gov (United States)

Luo, Yingxin; Li, Hongyin; Yeh, Hsien-Chi

2016-05-01

We present a prototype of a laser frequency auto-locking and re-locking control system designed for laser frequency stabilization in inter-satellite laser ranging system. The controller has been implemented on field programmable gate arrays and programmed with LabVIEW software. The controller allows initial frequency calibrating and lock-in of a free-running laser to a Fabry-Pérot cavity. Since it allows automatic recovery from unlocked conditions, benefit derives to automated in-orbit operations. Program design and experimental results are demonstrated.

Note: Digital laser frequency auto-locking for inter-satellite laser ranging

International Nuclear Information System (INIS)

Luo, Yingxin; Yeh, Hsien-Chi; Li, Hongyin

2016-01-01

We present a prototype of a laser frequency auto-locking and re-locking control system designed for laser frequency stabilization in inter-satellite laser ranging system. The controller has been implemented on field programmable gate arrays and programmed with LabVIEW software. The controller allows initial frequency calibrating and lock-in of a free-running laser to a Fabry-Pérot cavity. Since it allows automatic recovery from unlocked conditions, benefit derives to automated in-orbit operations. Program design and experimental results are demonstrated.

Note: Digital laser frequency auto-locking for inter-satellite laser ranging

Energy Technology Data Exchange (ETDEWEB)

Luo, Yingxin; Yeh, Hsien-Chi, E-mail: yexianji@mail.hust.edu.cn [MOE Key Laboratory of Fundamental Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Li, Hongyin [MOE Key Laboratory of Fundamental Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); School of Automation, Huazhong University of Science and Technology, Wuhan 430074 (China)

2016-05-15

We present a prototype of a laser frequency auto-locking and re-locking control system designed for laser frequency stabilization in inter-satellite laser ranging system. The controller has been implemented on field programmable gate arrays and programmed with LabVIEW software. The controller allows initial frequency calibrating and lock-in of a free-running laser to a Fabry-Pérot cavity. Since it allows automatic recovery from unlocked conditions, benefit derives to automated in-orbit operations. Program design and experimental results are demonstrated.

CO2 laser and plasma microjet process for improving laser optics

Science.gov (United States)

Brusasco, Raymond M.; Penetrante, Bernardino M.; Butler, James A.; Grundler, Walter; Governo, George K.

2003-09-16

A optic is produced for operation at the fundamental Nd:YAG laser wavelength of 1.06 micrometers through the tripled Nd:YAG laser wavelength of 355 nanometers by the method of reducing or eliminating the growth of laser damage sites in the optics by processing the optics to stop damage in the optics from growing to a predetermined critical size. A system is provided of mitigating the growth of laser-induced damage in optics by virtue of very localized removal of glass and absorbing material.

Laser wakefield acceleration

International Nuclear Information System (INIS)

Esarey, E.; Ting, A.; Sprangle, P.

1989-01-01

The laser wakefield accelerator (LWFA) is a novel plasma based electron acceleration scheme which utilizes a relativistic optical guiding mechanism for laser pulse propagation. In the LWFA, a short, high power, single frequency laser pulse is propagated through a plasma. As the laser pulse propagates, its radial and axial ponderomotive forces nonresonantly generate large amplitude plasma waves (wakefields) with a phase velocity equal to the group velocity of the pulse. A properly phased electron bunch may then be accelerated by the axial wakefield and focused by the transverse wakefield. Optical guiding of the laser pulse in the plasma is necessary in order to achieve high energies in a single stage of acceleration. At sufficiently high laser powers, optical guiding may be achieved through relativistic effects associated with the plasma electrons. Preliminary analysis indicates that this scheme may overcome some of the difficulties present in the plasma beat wave accelerator and in the plasma wakefield accelerator. Analytical and numerical calculations are presented which study both laser pulse propagation within a plasma as well as the subsequent generation of large amplitude plasma waves. In addition, the generation of large amplitude plasma waves in regimes where the plasma waves become highly nonlinear is examined

Synergistic skin heat shock protein expression in response to combined laser treatment with a diode laser and ablative fractional lasers.

Science.gov (United States)

Paasch, Uwe; Sonja, Grunewald; Haedersdal, Merete

2014-06-01

Diode laser-based skin heating has been shown to minimise scars by interfering with wound healing responses through the induction of heat shock proteins (HSP). HSP are also induced after ablative fractional laser (AFXL) wound healing. AFXL itself is highly recommended for scar treatment. Therefore, the sequential combination of both modalities may produce superior outcomes. The aim of this study was to examine the pretreatment effects of a diode laser before AFXL on wound healing responses in terms of HSP up-regulation in an in vitro model. Immediate responses and responses on days 1, 3 or 6 post-procedure were studied in an in vitro porcine skin model (n = 240). Untreated samples served as control. Immunohistochemical investigation (Hsp70) was performed in all untreated controls, diode laser-, AFXL-, and in diode laser + AFXL-treated samples. Hsp70 was shown to be up-regulated by all interventions between days 1 and 6 after interventions. The largest effect was caused by the combination of a diode laser and an AFXL procedure. Diode laser exposure induces a skin HSP response that can be further enhanced by sequential AFXL treatment. Clinical studies are necessary to investigate the dose response of HSP on scar formation and refine suitable laser exposure settings.

Development and characterization of femtosecond laser driven soft x-ray lasers

International Nuclear Information System (INIS)

Bettaibi, I.

2005-06-01

Coherent soft x-ray sources have an important potential for scientific, medical and industrial applications. The development of high intensity laser systems allowed the realization of new coherent and fast soft x-ray sources like high order harmonic generation and soft x-ray lasers. These sources are compact, cheaper than traditional sources such as synchrotrons, and are thus interesting. This thesis presents the study of a new soft x-ray laser pumped by a femto-second laser beam working at 10 Hz. The circularly polarized ultra intense laser is longitudinally focused in a cell filled with xenon or krypton, to obtain the amplification of two lasing lines at 41.8 nm and 32.8 nm in Pd-like xenon and Ni-like krypton respectively. We carry out an experimental and numerical study of the source to understand the importance of different parameters such as the laser intensity and polarization, the gas pressure and the cell length. We have also spatially and temporally characterized the soft x-ray laser beam. To compensate the refraction of the driving laser we have investigated guiding techniques consisting in creating a plasma channel by electric discharge or using the multiple reflections of the driving laser on the internal walls of the dielectric tubes of sapphire or glass. A spectacular improvement of the source performances has been observed in both cases. Finally, we present a preliminary study on a different x-ray scheme: the inner shell photo pumping of neutral atoms. We have developed an optical system, which should create the appropriate conditions for the realisation of short wavelength x-ray amplifier. (author)

New photoionization lasers pumped by laser-induced plasma radiation

International Nuclear Information System (INIS)

Hube, M.; Dieckmann, M.; Beigang, R.; Welling, H.; Wellegehausen, B.

1988-01-01

Innershell photoionization of atomic gases and vapors by soft x rays from a laser-produced plasma is a potential method for making lasers at short wavelengths. Normally, in such experiments only a single plasma spot or plasma line is created for the excitation. This gives high excitation rates but only a short excitation length. At high excitation rates detrimental influences, such as amplified spontaneous emission, optical saturation, or quenching processes, may decrease or even destroy a possible inversion. Therefore, it seems to be more favorable to use a number of separated plasma spots with smaller excitation rates and larger excitation lengths. As a test, a three-plasma spot device was constructed and used in the well-known Cd-photoionization laser at 442 nm. With a 600-mJ Nd:YAH laser (pulse length, 8 ns) for plasma production, output energies up to 300 μJ have been measured, which is more than a doubling of so far obtained data. On innershell excitation, levels may be populated that allow direct lasers as in the case of Cd or that are metastable and cannot be directly coupled to lower levels. In this case modifications in the excitation process are necessary. Such modifications may be an optical pump process in the atom prior to the innershell photoionization or an optical pump process (population transfer process) after the innershell ionization, leading to Raman or anti-Stokes Raman-type laser emissions. With these techniques and the developed multiplasma spot excitation device a variety of new laser emissions in K and Cs ions have been achieved which are indicated in the level schemes

Laser spectroscopy

CERN Document Server

Demtröder, Wolfgang

Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., ultrafast lasers (atto- and femto-second lasers) and parametric oscillators, coherent matter waves, Doppler-free Fourier spectroscopy with optical frequency combs, interference spectroscopy, quantum optics, the interferometric detection of gravitational waves and still more applications in chemical analysis, medical diagnostics, and engineering.

Laser induced nuclear reactions

International Nuclear Information System (INIS)

Ledingham, Ken; McCanny, Tom; Graham, Paul; Fang Xiao; Singhal, Ravi; Magill, Joe; Creswell, Alan; Sanderson, David; Allott, Ric; Neely, David; Norreys, Peter; Santala, Marko; Zepf, Matthew; Watts, Ian; Clark, Eugene; Krushelnick, Karl; Tatarakis, Michael; Dangor, Bucker; Machecek, Antonin; Wark, Justin

1998-01-01

Dramatic improvements in laser technology since 1984 have revolutionised high power laser technology. Application of chirped-pulse amplification techniques has resulted in laser intensities in excess of 10 19 W/cm 2 . In the mid to late eighties, C. K. Rhodes and K. Boyer discussed the possibility of shining laser light of this intensity onto solid surfaces and to cause nuclear transitions. In particular, irradiation of a uranium target could induce electro- and photofission in the focal region of the laser. In this paper it is shown that μCi of 62 Cu can be generated via the (γ,n) reaction by a laser with an intensity of about 10 19 Wcm -2

Temperature stabilization of injection lasers

International Nuclear Information System (INIS)

Albanese, A.

1987-01-01

Apparatus which stabilizes the temperature, and thereby the output wavelength, of an injection laser. Means monitor the laser terminal voltage across a laser and derive a voltage therefrom which is proportional to the junction voltage of the laser. Means compares the voltage to a reference value from source and a temperature controller adjusts the laser temperature in response to the results of the comparison. Further embodiments of the present invention vary the output wavelength of the laser by varying the reference value from source against which the laser junction voltage is compared. (author)

IceBridge Riegl Laser Altimeter L1B Time-Tagged Laser Ranges

Data.gov (United States)

National Aeronautics and Space Administration — The NASA IceBridge Riegl Laser Altimeter L1B Time-Tagged Laser Ranges (ILUTP1B) data set contains laser ranges, returned pulses, and deviation for returned pulses in...

New-laser research and development

International Nuclear Information System (INIS)

Anon.

1978-01-01

Two new-laser research efforts were initiated during the reporting period; the chemically pumped iodine laser and HgXe exciplex excitation by electric discharge. The chemically pumped iodine laser was recently discovered by personnel at the Air Force Weapons Laboratory. The laser offers exciting possibilities as an ICF driver because it does not require a capital-intensive pulse power source to drive it, and up to 10% efficiency may be possible. Modeling studies of the laser are in progress and its potential as a high-average power laser seems to be very favorable at this time. The HgXe exciplex radiates in a band centered at 265 nm. This system is being studied because it could be used to pump an iodine laser. Its potential as a high-power laser candidate will be assessed. An advanced oscillator system based upon a microprocessor-controlled Nd:YAG-pumped pulsed dye laser is being developed so that it can be used as the front end of new laser-fusion lasers and utilized in testing and making germane laser amplifier measurements of candidate laser systems for the wavelength region of 4000 A to 8000 A and extended range with frequency doubling and mixing. The operating requirements of the oscillator system include long-term stability, high reliability, absolute wavelength calibration and control, tunability, hands-off operation, and variable pulse width generation in the nanosecond regime

D2O laser pumped by an injection-locked CO2 laser for ion-temperature measurements

International Nuclear Information System (INIS)

Okada, Tatsuo; Ohga, Tetsuaki; Yokoo, Masakazu; Muraoka, Katsunori; Akazaki, Masanori.

1986-01-01

The cooperative Thomson scattering method is one of the various new techniques proposed for measuring the temperature of ions in nuclear fusion critical plasma, for which a high-performance FIR laser pumped by an injection-locked CO 2 laser is required. This report deals with D 2 O laser with a wavelength of 385 μm which is pumped by injection-locked single-mole TEA CO 2 laser composed of a driver laser and an output-stage laser. A small-sized automatic pre-ionization type laser is employed for the driver. The resonator of the driver laser consists of a plane grating of littrow arrangement and ZnSe plane output mirrors with reflection factor of 50 %. An aperture and ZnSe etalon are inserted in the resonator to produce single transverse- and longitudinal-mode oscillation, respectively. The output-stage laser is also of the automatic pre-ionization type. Theoretically, an injection power of 0.1 pW/mm 3 is required for a CO 2 laser. Single-mode oscillation of several hundred nW/mm 3 can be produced by the CO 2 laser used in this study. Tuning of the output-stage laser is easily controlled by the driver laser. High stability of the injection-locked operation is demonstrated. CO 2 laser beam is introduced into the D 2 O laser through a KCl window to excite D 2 O laser beam in the axial direction. Input and output characteristics of the D 2 O laser are shown. Also presented are typical pulse shapes from the D 2 O laser pumped by a free-running CO 2 laser pulse or by an injection-locked single-mode CO 2 laser pulse. (Nogami, K.)

Diode lasers and arrays

International Nuclear Information System (INIS)

Streifer, W.

1988-01-01

This paper discusses the principles of operation of III-V semiconductor diode lasers, the use of distributed feedback, and high power laser arrays. The semiconductor laser is a robust, miniature, versatile device, which directly converts electricity to light with very high efficiency. Applications to pumping solid-state lasers and to fiber optic and point-to-point communications are reviewed

Trends in laser micromachining

Science.gov (United States)

Gaebler, Frank; van Nunen, Joris; Held, Andrew

2016-03-01

Laser Micromachining is well established in industry. Depending on the application lasers with pulse length from μseconds to femtoseconds and wavelengths from 1064nm and its harmonics up to 5μm or 10.6μm are used. Ultrafast laser machining using pulses with pico or femtosecond duration pulses is gaining traction, as it offers very precise processing of materials with low thermal impact. Large-scale industrial ultrafast laser applications show that the market can be divided into various sub segments. One set of applications demand low power around 10W, compact footprint and are extremely sensitive to the laser price whilst still demanding 10ps or shorter laser pulses. A second set of applications are very power hungry and only become economically feasible for large scale deployments at power levels in the 100+W class. There is also a growing demand for applications requiring fs-laser pulses. In our presentation we would like to describe these sub segments by using selected applications from the automotive and electronics industry e.g. drilling of gas/diesel injection nozzles, dicing of LED substrates. We close the presentation with an outlook to micromachining applications e.g. glass cutting and foil processing with unique new CO lasers emitting 5μm laser wavelength.

Quality and performance of laser cutting with a high power SM fiber laser

DEFF Research Database (Denmark)

Kristiansen, Morten; Selchau, Jacob; Olsen, F. O.

2013-01-01

The introduction of high power single mode fiber lasers allows for a beam of high power and a good beam quality factor (M2 ” 1.2), compared to the multimode fiber lasers often utilised in macro laser metal cutting. This paper describes fundamental studies of macro laser metal cutting with a singl...

Laser Light: Using Laser Refractometry to Determine Concentration.

Science.gov (United States)

Gauger, Robert

1995-01-01

Laser refractometry is a science-technology-based activity that requires students to manipulate a variety of equipment, tools, materials, and critical-thinking skills. Students use a laser to measure the percent of glucose in a solution by calibrating the system, taking measurements, and computing the concentration. (MKR)

Laser experimental system as teaching aid for demonstrating basic phenomena of laser feedback

International Nuclear Information System (INIS)

Xu, Ling; Zhao, Shijie; Zhang, Shulian

2015-01-01

An experimental laser teaching system is developed to demonstrate laser feedback phenomena, which bring great harm to optical communication and benefits to precision measurement. The system consists of an orthogonally polarized He-Ne laser, a feedback mirror which reflects the laser output light into the laser cavity, and an optical attenuator which changes the intensity of the feedback light. As the feedback mirror is driven by a piezoelectric ceramic, the attenuator is adjusted and the feedback mirror is tilted, the system can demonstrate many basic laser feedback phenomena, including weak, moderate and strong optical feedback, multiple feedback and polarization flipping. Demonstrations of these phenomena can give students a better understanding about the intensity and polarization of lasers. The system is well designed and assembled, simple to operate, and provides a valuable teaching aid at an undergraduate level. (paper)

Põhjamaade ja Baltimaade arhitektuuritriennaal PBAT/NBAT / Irina Raud

Index Scriptorium Estoniae

Raud, Irina

1999-01-01

Osa võtma kutsuti arhitektid Islandilt, Norrast, Taanist, Rootsist, Soomest, Leedust, Lätist ja Eestist. Esimene triennaal (PBAT) toimus 24.09.-26.09. 1990 teemal "Metropolism and provincialism", II 1993. a. peateemaga "Architecture and induviduality", III 1996. a. peateemaga "Space and water"

Algab "Valgete ööde" festival

Index Scriptorium Estoniae

2006-01-01

18. juunil toimub Endla teatri küünis nüüdistantsule ja -teatrile keskenduva "Valgete ööde" festivali esimene etendus - saab näha tantsutruppi Company B. Valiente. Esitatakse tantsulavastus "Body Business" (koreograafid Marcelino Martin Valiente ja Gunhild Bjornsgaard)

Villu Kangur : uus naljasari on elust enesest / Merike Kungla

Index Scriptorium Estoniae

Kungla, Merike

2005-01-01

Vana-aasta õhtul läheb Eesti Televisioonis eetrisse esimene osa kodumaisest komöödiasarjast "Hajameelselt abielus". Stsenaristid on Gert Kiiler ja Villu Kangur. Lavastavad Üllar Saaremäe ja Tõnu Oja. Sarja tootjafirma on Umberto Productions. Stsenarist Villu Kangur sarjast