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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-2368</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>Исправление методологической неточности в эксперименте по двухволновому смешению</article-title><trans-title-group xml:lang="en"><trans-title>Correction of Methodological Inaccuracy in a Two-Beam Coupling Experiment</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>Агашков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Agashkov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">a.agashkov@ifanbel.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 НАН Беларуси</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>В. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>10</day><month>09</month><year>2026</year></pub-date><volume>93</volume><issue>3</issue><fpage>423</fpage><lpage>431</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Агашков А.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Агашков А.В.</copyright-holder><copyright-holder xml:lang="en">Agashkov A.V.</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/2368">https://zhps.ejournal.by/jour/article/view/2368</self-uri><abstract><p>   Анализ экспериментальных работ по двухволновому смешению (ДВС) показал, что выводы об установлении фоторефрактивных свойств исследуемых решеток на основании асимметричного изменения во времени выходных пучков методологически не точны. Фактически в работах сравнивались выходные пучки интерферометра Маха—Цендера, в котором сформированная решетка является выходным светоделителем. Проведенные сравнительные экспериментальные исследования с использованием обычной фазовой поверхностной голографической решетки и фоторефрактивной решетки, сформированной в жидкокристаллической ячейке, полностью подтвердили результаты анализа. Показано, что включение в стандартную схему ДВС прерывателя, периодически включающего и выключающего один из падающих пучков, и фазового модулятора для знакопеременного гармонического изменения фазового сдвига между пучками обеспечивает корректное установление фоторефрактивных свойств исследуемой решетки.</p></abstract><trans-abstract xml:lang="en"><p>   An analysis of experimental studies on two-beam coupling (2BC) revealed that the conclusions about establishing the photorefractive properties of the studied gratings based on the asymmetric temporal fluctuations of the output beams are methodologically inaccurate. In fact, the studies compared the output beams of a Mach–Zehnder interferometer, in which the grating itself serves as the output beam splitter. Comparative experimental studies using a conventional phase surface holographic grating and a photorefractive grating formed in a liquid crystal cell fully confirmed the results of the analysis. It is shown that the inclusion of a chopper, periodically switching on and off one of the incident beams, and a phase modulator for alternating harmonic change of the phase shift between the beams in the standard 2BC set-up ensures the correct establishment of the photorefractive properties of the grating under study.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>двухволновое смешение</kwd><kwd>фоторефрактивная решетка</kwd><kwd>экспериментальная методика</kwd><kwd>интерферометр Маха—Цендера</kwd></kwd-group><kwd-group xml:lang="en"><kwd>two-beam coupling</kwd><kwd>photorefractive grating</kwd><kwd>experimental technique</kwd><kwd>Mach–Zehnder interferometer</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственной программы научных исследований “Фотоника и электроника для инноваций” (задание 1.1) при финансовой поддержке НАН Беларуси</funding-statement><funding-statement xml:lang="en">The work was carried out within the framework of the state scientific research program “Photonics and Electronics for Innovation” (task 1.1) with the financial support of the National Academy of Sciences Belarus</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">L. 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