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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-1234</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>Возбуждение электронной плазменной волны самофокусирующимися сosh-гауссовыми лазерными пучками в неоднородной бесстолкновительной плазме</article-title><trans-title-group xml:lang="en"><trans-title>Excitation of Electron Plasma Wave by Self Focused Cosh-Gaussian Laser Beams in Collisionless Plasmas: Effect of Density Ramp</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>Gupta</surname><given-names>N.</given-names></name><name name-style="western" xml:lang="en"><surname>Gupta</surname><given-names>N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пхагвар</p></bio><bio xml:lang="en"><p>Phagwara</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Kumar</surname><given-names>S.</given-names></name><name name-style="western" xml:lang="en"><surname>Kumar</surname><given-names>S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Карнал</p></bio><bio xml:lang="en"><p>Karnal</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Bhardwaj</surname><given-names>S. B.</given-names></name><name name-style="western" xml:lang="en"><surname>Bhardwaj</surname><given-names>S.B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Матак-Маджри, Карнал</p></bio><bio xml:lang="en"><p>Matak-Majri, Karnal</p></bio><email xlink:type="simple">naveens222@rediffmail.com</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет Пхагвара</institution></aff><aff xml:lang="en"><institution>Department of Physics, Lovely Professional University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Государственный колледж для женщин</institution></aff><aff xml:lang="en"><institution>Department of Physics, Government College for Women</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Государственный колледж SUS</institution></aff><aff xml:lang="en"><institution>Department of Physics, SUS Govt. College</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>04</day><month>02</month><year>2023</year></pub-date><volume>90</volume><issue>1</issue><fpage>120</fpage><lpage>120</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Gupta N., Kumar S., Bhardwaj S.B., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Gupta N., Kumar S., Bhardwaj S.B.</copyright-holder><copyright-holder xml:lang="en">Gupta N., Kumar S., Bhardwaj S.</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/1234">https://zhps.ejournal.by/jour/article/view/1234</self-uri><abstract><p>Теоретически исследована динамика управляемых лазером волн электронной плазмы (EPW) в плазме с осевым скачком плотности с учетом самофокусировки лазерного луча на мощность EPW, возбуждаемого лазером. Во время распространения через плазму лазерный луч возбуждает EPW с частотой ωep, которая из-за оптической нелинейности плазмы нелинейно связана с лазерным лучом. На основе вариационной теории получены полуаналитические решения связанных нелинейных волновых уравнений для волны накачки и EPW с использованием квазиклассического приближения. Показано, что на мощность EPW существенно влияет эффект самофокусировки луча накачки. </p></abstract><trans-abstract xml:lang="en"><p>Dynamics of the laser driven electron plasma waves (EPWs) in plasmas with axial density ramp has been investigated theoretically. The effect of self-focusing of the laser beam on the power of laser excited EPW has been incorporated. During its propagation through the plasma, the laser beam excites an EPW at frequency ωep that due to the optical nonlinearity of plasma gets nonlinearly coupled to the laser beam. Using variational theory semi analytical solutions of the coupled nonlinear wave equations for the pump wave and EPW have been obtained under W.K.B. approximation technique. It has been observed that power of the EPW is significantly affected by the self-focusing effect of pump beam. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>самофокусировка</kwd><kwd>электронно-плазменная волна</kwd><kwd>cosh-гауссов лазерный пучок</kwd><kwd>пондеромоторная сила</kwd></kwd-group><kwd-group xml:lang="en"><kwd>self-focusing</kwd><kwd>electron plasma wave</kwd><kwd>cosh-Gaussian</kwd><kwd>ponderomotive force</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">R. S. Craxton, K. S. Anderson, T. R. Boehly, V. N. Goncharov, D. R. Harding, J. P. Knauer, R. L. McCrory, P. W. McKenty, D. D. Meyerhofer, J. F. Myatt, A. J. Schmitt, J. D. Sethian, R. W. Short, S. Skupsky, W. Theobald, W. L. 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