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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-1818</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>АННОТАЦИИ АНГЛОЯЗЫЧНЫХ СТАТЕЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ABSTRACTS ENGLISH-LANGUAGE ARTICLES</subject></subj-group></article-categories><title-group><article-title>Нелинейное взаимодействие q-гауссова лазерного пучка с ненамагниченной плазмой: влияние релятивистской и пондеромоторной нелинейности</article-title><trans-title-group xml:lang="en"><trans-title>Nonlinear Interaction of q-Gaussian Laser Beam with Unmagnetized Plasma: Effect of Relativistic and Ponderomotive Nonlinearity</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>Walia</surname><given-names>K.</given-names></name><name name-style="western" xml:lang="en"><surname>Walia</surname><given-names>Keshav</given-names></name></name-alternatives><bio xml:lang="ru"><p>Джаландхар</p></bio><bio xml:lang="en"><p>Jalandhar</p></bio><email xlink:type="simple">keshavwalia86@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>Tripathy</surname><given-names>A.</given-names></name><name name-style="western" xml:lang="en"><surname>Tripathy</surname><given-names>Anamika</given-names></name></name-alternatives><bio xml:lang="ru"><p>Джаландхар</p></bio><bio xml:lang="en"><p>Jalandhar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет DAV</institution></aff><aff xml:lang="en"><institution>Department of Physics, DAV University Jalandhar</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>28</day><month>03</month><year>2025</year></pub-date><volume>92</volume><issue>2</issue><fpage>261</fpage><lpage>261</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Walia K., Tripathy A., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Walia K., Tripathy A.</copyright-holder><copyright-holder xml:lang="en">Walia K., Tripathy 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://zhps.ejournal.by/jour/article/view/1818">https://zhps.ejournal.by/jour/article/view/1818</self-uri><abstract><p>Исследовано нелинейное взаимодействие q-гауссова лазерного пучка с ненамагниченной плазмой. Релятивистская и пондеромоторная нелинейности рассматриваются вместе. Квазиклассическое приближение и параксиальная теория используются для вывода дифференциального уравнения второго порядка, выражающего изменение перетяжки пучка в зависимости от нормализованного расстояния распространения. Поведение перетяжки пучка в зависимости от нормализованного расстояния распространения исследуется с помощью метода RK4. Проанализировано влияние установленных параметров лазера и плазмы (температуры плазмы, интенсивности лазера, плотности плазмы и параметра q) на перетяжку пучка.</p></abstract><trans-abstract xml:lang="en"><p>The present work explores the nonlinear interaction of q-Gaussian laser beam with unmagnetized plasma. Relativistic and ponderomotive nonlinearities are taken together in the present investigation. The Wentzel–Kramers–Brillouin (WKB) approximation and paraxial theory are used for deriving the secondorder ODE-expressing variation of beam waist against the normalized propagation distance. Further, the behavior of the beam waist against normalized propagation distance is explored through the RK4 method. The impact of established parameters of laser and plasma such as plasma temperature, laser intensity, plasma density, and q parameter on the beam waist is also analyzed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>q-гауссов пучок</kwd><kwd>ненамагниченная плазма</kwd><kwd>релятивистские эффекты</kwd><kwd>пондеромоторная нелинейность</kwd><kwd>перетяжка пучка</kwd><kwd>температура электронов</kwd></kwd-group><kwd-group xml:lang="en"><kwd>q-Gaussian beam</kwd><kwd>unmagnetized plasma</kwd><kwd>relativistic effects</kwd><kwd>ponderomotive nonlinearity</kwd><kwd>beam waist</kwd><kwd>temperature of electron</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">K. A. Brueckner, S. Jorna, Rev. Mod. Phys., 46, 325 (1974).</mixed-citation><mixed-citation xml:lang="en">K. A. Brueckner, S. Jorna, Rev. Mod. 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