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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">najo-1078</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="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Interference effects in microchip laser with intracavity frequency doubling</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Kerobyan</surname><given-names>M. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Ashtarak;</p><p>Yerevan.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="en">Institute for physical research, NAS RA; Spectralus CJSC<country>Armenia</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2013</year></pub-date><pub-date pub-type="epub"><day>17</day><month>08</month><year>2025</year></pub-date><volume>4</volume><issue>6</issue><fpage>772</fpage><lpage>777</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Kerobyan M.I., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Kerobyan M.I.</copyright-holder><copyright-holder xml:lang="en">Kerobyan M.I.</copyright-holder><license 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://nanojournal.ifmo.ru/jour/article/view/1078">https://nanojournal.ifmo.ru/jour/article/view/1078</self-uri><abstract><p>The temperature dependence of output power of microchip laser with intracavity frequency doubling is investigated, where oscillations in the output power are observed. Similar oscillations are observed in the temperature tuning of single pass second harmonic generation in plane parallel nonlinear crystal. It is supposed that in both two cases the oscillations have the same origin. Single pass second harmonic generation is investigated experimentally and theoretically, and it is shown that oscillations are due to multiple beam interference in the nonlinear crystal. Results of the experiments and calculations are presented.</p></abstract><kwd-group xml:lang="en"><kwd>Microchip laser</kwd><kwd>quasi-phase matching</kwd><kwd>optical second harmonic generation</kwd><kwd>intracavity frequency doubling</kwd></kwd-group><funding-group xml:lang="en"><funding-statement>The author is grateful to Dr. Suren Soghomonyan and Anna Gyulasaryan from Spectralus CJSC for valuable discussions and support in the experiments.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">N. Bloembergen, P.S. Pershan. Light Waves at the Boundary of Nonlinear Media. Physical Review, 128(2), P. 606–622 (1962).</mixed-citation><mixed-citation xml:lang="en">N. Bloembergen, P.S. Pershan. Light Waves at the Boundary of Nonlinear Media. 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