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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-158</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>БЕЗОПАСНЫЕ ДЛЯ ГЛАЗ ВКР-ЛАЗЕРЫ НА КРИСТАЛЛЕ KGd(WO4)2: СРАВНИТЕЛЬНОЕ ИССЛЕДОВАНИЕ ПРИ НАКАЧКЕ KGd(WO4)2:Nd-ЛАЗЕРАМИ С РАБОЧИМИ ПЕРЕХОДАМИ4F3/2®4I11/2 И4F3/2®4I13/2</article-title><trans-title-group xml:lang="en"><trans-title>EYE-SAFE KGd(WO4)2RAMAN LASERS:A COMPARATIVE STUDY AT PUMPINGBY Nd:KGd(WO4)2 LASERS WITH4F3/2®4I11/2 AND4F3/2®4I13/2 WORKING TRANSITIONS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дашкевич</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Dashkevich</surname><given-names>V. I.</given-names></name></name-alternatives><email xlink:type="simple">v.dashkevich@dragon.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Русак</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rusak</surname><given-names>A. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Орлович</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Orlovich</surname><given-names>V. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шкадаревич</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Shkadarevich</surname><given-names>A. P.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики им. Б. И. Степанова НАН Беларуси</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Унитарное предприятие “НТЦ “ЛЭМТ” БелОМО”</institution></aff><aff xml:lang="en"><institution>Unitary Enterprise “STC “LEMT” of the BelOMO”</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>10</day><month>03</month><year>2020</year></pub-date><volume>84</volume><issue>6</issue><fpage>889</fpage><lpage>897</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дашкевич В.И., Русак А.А., Орлович В.А., Шкадаревич А.П., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Дашкевич В.И., Русак А.А., Орлович В.А., Шкадаревич А.П.</copyright-holder><copyright-holder xml:lang="en">Dashkevich V.I., Rusak A.A., Orlovich V.A., Shkadarevich A.P.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://zhps.ejournal.by/jour/article/view/158">https://zhps.ejournal.by/jour/article/view/158</self-uri><abstract><p>Проведено сравнительное исследование безопасных для глаз внерезонаторных KGd(WO4)2 (KGW) ВКР-лазеров, преобразующих многомодовое излучение импульсных KGW:Nd-лазеров, работающих на переходах4F3/2-4I11/2 и4F3/2-4I13/2, в третью стоксову компоненту на l = 1500 нм и первую стоксову компоненту на l = 1507 или 1538 нм. При одинаковых размерах комбинационных и лазерных элементов ВКР-лазер, излучающий третью стоксову компоненту, обеспечивает более высокую энергию импульса (~14.2 мДж) и меньшую расходимость стоксова пучка (~9.4 мрад), причем при более низкой энергии накачки KGW:Nd-лазера (~6.7 Дж). При энергии импульсов накачки 29-34 мДж все ВКР-лазеры имеют практически одинаковый оптический КПД генерации, достигающий 36 %. Однако с точки зрения электрический энергии, подводимой к лампе накачки, полный КПД ВКР-лазера третьей стоксовой компоненты в ~1.7 раза выше. Длительность ВКР-импульсов сравнима с длительностью импульсов накачки и составляет ~20 нс для первых стоксовых компонент. Импульс третьей стоксовой компоненты в 2.5-3 раза короче. В силу разного уровня накачки и разной силы термооптических искажений лазерных KGW:Nd-элементов распределение плотности энергии в пучках первых стоксовых компонент является эллиптическим, тогда как в пучке третьей стоксовой компоненты оно практически круговое. Показана возможность одновременной генерации на длинах волн 1507 и 1538 нм при параллельных и взаимно ортогональных поляризациях стоксовых волн. </p></abstract><trans-abstract xml:lang="en"><p>A comparative study of eye-safe extracavity KGW Raman lasers that convert multimode radiation from Nd:KGW lasers operating on4F3/2-4I11/2 and4F3/2-4I13/ transitions into the third Stokes component at l = 1500 nm and the first Stokes component at l = 1507 or 1538 nm, respectively, was carried out. For the same sizes of laser and Raman elements, Raman laser emitting the third Stokes component provides higher power and energy of the pulse (~14.2 mJ) and smaller divergence of the Stokes beam (~9.4 mrad) at lower pump energy of Nd:KGW laser (~6.7 J). At the pump pulse energy of 29-34 mJ, all Raman lasers have the same optical efficiency reaching 36 %. However, in terms of the electrical energy delivered to the flashlamp, the total efficiency of the Raman laser of the third Stokes component is »1.7 times larger. The duration of Raman pulses is comparable to that of pump pulses and is ~20 ns for the first Stokes components. The pulse of the third Stokes component is shorter by a factor of 2.5-3. Because of different pump levels and different strength of thermo-optical distortions of Nd:KGW laser elements, the energy density distribution for the beams of the first Stokes component is elliptical, while it is almost circular for the beam the of the third Stokes component. The possibility of simultaneous lasing at wavelengths of 1507 and 1538 nm in parallel and orthogonal polarizations of Stokes waves is shown. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>вынужденное комбинационное рассеяние</kwd><kwd>внeрезонаторный KGW ВКР-лазер</kwd><kwd>многомодовый KGW:Nd-лазер накачки</kwd><kwd>первая и третья стоксовы компоненты</kwd><kwd>безопасное для глаз излучение</kwd><kwd>stimulated Raman scattering</kwd><kwd>extracavity KGW Raman laser</kwd><kwd>multimode Nd:KGW pump laser</kwd><kwd>first and third Stokes components</kwd><kwd>eye-safe radiation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">D. C. Hanna, D. J. Pointer. Opt. Commun., 60, N 3 (1986) 187-190</mixed-citation><mixed-citation xml:lang="en">D. C. Hanna, D. J. Pointer. Opt. 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