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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">10.29235/1561-2430-2020-56-3-373-383</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-540</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>Световые пучки бесселева типа, формируемые двухкомпонентной схемой из аксикона и сферической линзы</article-title><trans-title-group xml:lang="en"><trans-title>Bessel-like light beams formed by the two-component scheme consisting of an axicon and a spherical lens</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>Хило</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Khilo</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хило Николай Анатольевич – кандидат физико-математических наук, ведущий научный сотрудник</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Nikolai A. Khilo – Ph. D. (Physics and Mathematics), Leading Scientific Researcher</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">n.khilo@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>Ропот</surname><given-names>П. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Ropot</surname><given-names>P. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ропот Петр Иосифович – кандидат физико-математических наук, заместитель заведующего центром «Диагностические системы»</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Piotr I. Ropot – Ph. D. (Physics and Mathematics), Deputy Head of the Center ”Diagnostic Systems”</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">p.ropot@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>Петров</surname><given-names>П. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>P. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Петров Петр Казимирович – кандидат физикоматематических наук, ведущий научный сотрудник</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Piotr K. Petrov – Ph. D. (Physics and Mathematics), Leading Scientific Researcher</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">p.piatrou@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>Белый</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Belyi</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Белый Владимир Николаевич – член-корреспондент, доктор физико-математических наук, заведующий центром «Диагностические системы»</p><p>пр. Независимости, 68-2, 220072, г. Минск</p></bio><bio xml:lang="en"><p>Vladimir N. Belyi – Corresponding Member, Dr. Sc. (Physics and Mathematics), Professor, Head of the Center ”Diagnostic Systems”</p><p>68-2, Nezavisimosti Ave., 220072, Minsk</p></bio><email xlink:type="simple">v.belyi@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><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>18</day><month>10</month><year>2020</year></pub-date><volume>56</volume><issue>3</issue><fpage>373</fpage><lpage>383</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хило Н.А., Ропот П.И., Петров П.К., Белый В.Н., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Хило Н.А., Ропот П.И., Петров П.К., Белый В.Н.</copyright-holder><copyright-holder xml:lang="en">Khilo N.A., Ropot P.I., Petrov P.K., Belyi V.N.</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/540">https://vestifm.belnauka.by/jour/article/view/540</self-uri><abstract><p>Совмещение в оптической схеме сильно различающихся элементов, таких как аксиконы и сферические линзы, позволяет формировать световые поля, которые отличаются многообразием свойств. Простейший пример такой схемы состоит из аксикона и пространственно разнесенной сферической линзы. Хотя данная схема исследовалась ранее, однако неизученной остается область так называемой вторичной фокусировки, расположенная за хорошо известным кольцевым фокусом. В работе проведен аналитический и численный расчеты светового поля в области вторичной фокусировки. Определены границы этой области и рассчитано продольное и поперечное распределение интенсивности света. Показано, что ближняя зона области вторичной фокусировки формируется в режиме скачкообразной автофокусировки кольцевого поля. Установлено, что поперечное распределение интенсивности в дальней зоне является в общем случае суперпозицией кольцевого поля и осциллирующего поля осевого типа. Определено расстояние между аксиконом и линзой, когда кольцевая компонента поля практически исчезает. Показано, что в этом случае световое поле в области вторичной фокусировки является локально бесселевым световым пучком. Особенность этого пучка заключается в том, что его угол конуса зависит от продольной координаты, а именно, уменьшается обратно пропорционально расстоянию z от начала области. Важным свойством таких z-зависящих бесселевых пучков является отсутствие их трансформации в кольцевые поля, как это происходит для традиционных бесселевых или Бессель-гауссовых пучков в дальней зоне. Это открывает перспективу использования z-зависящих бесселевых пучков для целей оптической связи в свободном пространстве и дистанционного зондирования.</p></abstract><trans-abstract xml:lang="en"><p>The combination in an optical scheme of rather different elements such as axicons and spherical lenses allows forming light fields that differ by a variety of properties. The simplest example of such a scheme consists of an axicon and a spherical lens spatially separated from it. Though this scheme was investigated earlier, the region of so-called secondary focusing located behind the well-known annular focus has not been studied yet. In this paper, the analytical and numerical analysis of a light field in the region of secondary focusing is conducted. The boundaries of this region are determined, and the longitudinal and transverse distribution of the light intensity is calculated. It is shown that the near field region of secondary focusing is formed in the regime of abrupt autofocusing of the annular field. It is established that in a general case the transverse intensity distribution in the far field region is a superposition of an annular field and an oscillating axialtype field. The distance between the axicon and the lens is determined when the annular component of the field practically disappears. It is shown that in this case the light field in the region of the secondary focusing is a locally Bessel light beam. The peculiarity of this beam is that its cone angle depends on the longitudinal component, namely, decreases in inverse proportion while the distance z increases. The important feature of such z-dependent Bessel beams is the absence of their transformation into annular fields, as it occurs for ordinary Bessel or Bessel-Gaussian beams in the far field region. This opens the prospect for application of z-dependent Bessel beams for optical communication in free space and remote probing, which is why such beams are perspective for application in different systems of remote probing.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>аксикон-линза</kwd><kwd>бесселевы световые пучки</kwd><kwd>кольцевые поля</kwd><kwd>пространственные спектры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>axicon-lens</kwd><kwd>Bessel light beams</kwd><kwd>annular fields</kwd><kwd>spatial spectra</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">Ring pattern of a lens-axicon doublet illuminated by a Gaussian beam / P. Belanger [et al.] // Appl. Opt. – 1978. – Vol. 17, № 7. – P. 1080–1086. https://doi.org/10.1364/ao.17.001080</mixed-citation><mixed-citation xml:lang="en">Belanger P., Rioux M. 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