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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2021-57-3-374-384</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-604</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>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>Параметрическая генерация света в двуосном кристалле KTA при накачке излучением YAG:Nd-лазера в произвольных направлениях</article-title><trans-title-group xml:lang="en"><trans-title>Optical parametric generation in biaxial KTA crystal under pumping by YAG:Nd laser in arbitrary directions</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>U. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дашкевич Владимир Иванович – кандидат физико-математических наук, ведущий научный сотрудник лаборатории нелинейной оптики</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Uladzimir I. Dashkevich – Ph. D. (Physics and Mathematics), Leading Scientiﬁc Researcher of the Laboratory of Nonlinear Optics</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><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><bio xml:lang="ru"><p>Русак Анастасия Александровна – научный сотрудник лаборатории нелинейной оптики</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Аnastasiya A. Rusak – Scientiﬁc Researcher of the Laboratory of Nonlinear Optics</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">bui.anastasiya@gmail.com</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>Тимофеева</surname><given-names>Г. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Timofeeva</surname><given-names>G. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тимофеева Галина Ивановна – кандидат физико-математических наук, старший научный сотрудник лаборатории нелинейной оптики</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Galina I. Timofeeva – Ph. D. (Physics and Mathematics), Senior Scientiﬁc Researcher of the Laboratory of Nonlinear Optics</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">g.timofeeva@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>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><bio xml:lang="ru"><p>Шкадаревич Алексей Петрович – академик Национальной академии наук Беларуси, доктор физико-математических наук, директор унитарного предприятия «НТЦ «ЛЭМТ» БелОМО»</p><p> г. Минск</p></bio><bio xml:lang="en"><p>Aliaksei P. Shradarevich – Academician of the National Academy of Sciences of Belarus, Dr. Sc. (Physics and Mathematics), Director of the Unitary Enterprise “STC “LEMT” of the BelOMO”</p></bio><email xlink:type="simple">shkad@lemt.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Апанасевич</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Apanasevich</surname><given-names>P. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Апанасевич Павел Андреевич – академик Национальной академии наук Беларуси, доктор физико математических наук, профессор, главный научный сотрудник</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Pavel A. Apanasevich – Academician of the National Academy of Sciences of Belarus, Dr. Sc. (Physics and Mathematics), Professor, Chief Researcher</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">p.apanasevich@ifanbel.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>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><bio xml:lang="ru"><p>Орлович Валентин Антонович – академик Национальной академии наук Беларуси, доктор физико-математических наук, заведующий лабораторией нелинейной оптики</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Valentin A. Orlovich – Academician of the National Academy of Sciences of Belarus, Dr. Sc. (Physics and Mathematics), Head of the Laboratory of Nonlinear Optics</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">v.orlovich@dragon.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики им. Б. И. Степанова Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-технический центр «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>2021</year></pub-date><pub-date pub-type="epub"><day>07</day><month>10</month><year>2021</year></pub-date><volume>57</volume><issue>3</issue><fpage>374</fpage><lpage>384</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дашкевич В.И., Русак А.А., Тимофеева Г.И., Шкадаревич А.П., Апанасевич А.П., Орлович В.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Дашкевич В.И., Русак А.А., Тимофеева Г.И., Шкадаревич А.П., Апанасевич А.П., Орлович В.А.</copyright-holder><copyright-holder xml:lang="en">Dashkevich U.I., Rusak A.A., Timofeeva G.I., Shkadarevich A.P., Apanasevich P.A., Orlovich V.A.</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://vestifm.belnauka.by/jour/article/view/604">https://vestifm.belnauka.by/jour/article/view/604</self-uri><abstract><p>На основе выражений для показателя преломления изонормальных волн проанализирована возможность выполнения коллинеарного фазового синхронизма для параметрической генерации света в произвольных направлениях двуосного кристалла KTA при накачке излучением YAG:Nd-лазера. Рассчитаны перестроечные кривые, определяющие диапазон перестройки сигнальной и холостой волн для синхронизма типов I и II и произвольных углов q и j в случаях, когда перестройка осуществляется по углу q при фиксированном угле j и наоборот. Определены эффективные нелинейные коэффициенты. Показано, что их максимальное значение обеспечивается при 90-градусном по углу q фазовом синхронизме типа II. Для случая генерации безопасного для глаз излучения произведена оценка спектральной и угловой ширины синхронизма, а также ширины полосы усиления ПГС при монохромной накачке.</p></abstract><trans-abstract xml:lang="en"><p>Herein, on the basis of expressions for the refractive indices of isonormal waves, the possibility of performing collinear phase matching for optical parametric generation in arbitrary directions of a biaxial KTA crystal under pumping by radiation of a YAG:Nd laser is analyzed. The tuning curves that determine the tuning range of the signal and idler for type-I and II-type phase-matching and arbitrary angles θ and φ in cases where the tuning is carried out along the angle θ at a ﬁxed angle φ and vice versa are calculated. The eﬀective nonlinear coeﬃcient is determined. It is shown that their maximum value is achieved аt a polar angle θ = 90° and type-II phase-matching. For the case of generation of eye-safe radiation the spectral and angular phase matching widths were estimated, as well as gain widths of KTA-OPO under monochromatic pumping.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>параметрическая генерация света</kwd><kwd>кристалл KTA</kwd><kwd>фазовый синхронизм</kwd></kwd-group><kwd-group xml:lang="en"><kwd>optical parametric generation</kwd><kwd>KTA crystal</kwd><kwd>phase matching</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">Infrared corrected Sellmeier coeﬃcients for potassium titanyl arsenate / D. L. Fenimore [et al.] // J. Opt. Soc. Am. B. – 1995. – Vol. 12, № 5. – P. 794–796. https://doi.org/10.1364/josab.12.000794</mixed-citation><mixed-citation xml:lang="en">Fenimore D. L., Schepler K. L., Ramabadran U. B., McPherson S. R. Infrared corrected Sellmeier coeﬃcients for potassium titanyl arsenate. 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