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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">10.29235/1561-2430-2022-58-1-90-100</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-632</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>Формирование бесселевых световых пучков на больших расстояниях из кольцевых полей</article-title><trans-title-group xml:lang="en"><trans-title>The formation of Bessel light beams at large distances from annular fields</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, Минск</p></bio><bio xml:lang="en"><p>Nikolai A. Khilo – Ph. D. (Physics and Mathematics), Leading 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, 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 физико-математических наук, ведущий научный сотрудник</p><p>пр. Независимости, 68-2, 220072, Минск</p></bio><bio xml:lang="en"><p>Piotr K. Petrov – Ph. D. (Physics and Mathematics), Leading 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 – академик Национальной академии наук Беларуси, доктор физико-математических наук, заведующий центром «Диагностические системы»</p><p>пр. Независимости, 68-2, 220072, Минск</p></bio><bio xml:lang="en"><p>Vladimir N. Belyi – Academician of the National Academy of Sciences of Belarus, 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 имени 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>2022</year></pub-date><pub-date pub-type="epub"><day>04</day><month>04</month><year>2022</year></pub-date><volume>58</volume><issue>1</issue><fpage>90</fpage><lpage>100</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хило Н.А., Ропот П.И., Петров П.К., Белый В.Н., 2022</copyright-statement><copyright-year>2022</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/632">https://vestifm.belnauka.by/jour/article/view/632</self-uri><abstract><p>Исследован процесс трансформации кольцевого пучка в поле бесселева типа за счет дифракции при распространении в свободном пространстве на большие расстояния и вследствие эффекта фокусировки. Рассмотрен ряд моделей кольцевых полей, включая аналитическую модель в виде полиномиальной функции в ограниченной области пространства, а также экспериментально реализуемую модель на основе схемы с двумя аксиконами. Проведено сравнение поперечного и продольного распределений интенсивности для этих моделей и обнаружена высокая степень устойчивости структуры продольного распределения осевой интенсивности к изменению модели кольцевого поля. Данное продольное распределение характеризуется наличием интенсивного максимума с несимметричным профилем, появление которого не связано с линзовой фокусировкой. В начальной области указанного максимума зарождается процесс формирования бесселева пучка из кольцевого и имеет место резкое увеличение интенсивности. Обнаружено также, что фокусировка кольцевого поля на большие расстояния существенно отличается от фокусировки на короткие расстояния. В случае больших расстояний рост осевой интенсивности имеет место не в окрестности фокальной плоскости, а значительно ближе к излучателю, причем выброс интенсивности, вызванный непосредственно фокусировкой, не идентифицируется. Рассчитан поперечный профиль пучка бесселева типа на больших расстояниях. Показано, что этот профиль характеризуется малым числом боковых колец, а в осевом максимуме и первом кольце содержится более 90 % световой мощности. Рассмотрена проблема генерации модельного кольцевого поля резонатором Фурье-типа со специальным зеркалом-транспарантом.</p></abstract><trans-abstract xml:lang="en"><p>In this work, the process of transformation of an annular beam in a Bessel-like field due to diffraction during propagation in a free space over long distances and due to the focusing effect is investigated. A number of models of annular fields are considered, including an analytical model in the form of a polynomial function in a bounded region of space, as well as an experimentally implemented model based on a scheme with two axicons. A comparison is made of the transverse and longitudinal intensity distributions for these models, and a high degree of stability of the structure of the longitudinal distribution of the axial intensity to a change in the model of the annular field is found. This distribution is characterized by the presence of an intense maximum with an asymmetric profile, the appearance of which is not connected with lens focusing. In the initial region of the pointed maximum, the process of formation of a Bessel beam from an annular beam arises, and a sharp increase in intensity takes place. It is also established that the focusing of an annular field at large distances essentially differs from focusing at short distances. In the case of large distances, the increase of the axial intensity does not take place in the vicinity of the focal plane, but much closer to the transmitter, and here the great increase of intensity caused by direct focusing is not identified. The transverse profile of a Bessel-like beam is calculated at large distances. It is shown that this profile is characterized by a small number of lateral rings, and the axial maximum and the first ring contain more than 90% of the light power. The problem of generation of a model annular field by a Fourier-type resonator with a special transparency mirror is considered.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>бесселевы световые пучки</kwd><kwd>аксиконы</kwd><kwd>кольцевые поля</kwd><kwd>пространственные спектры</kwd><kwd>фокусировка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Bessel light beams</kwd><kwd>axicons</kwd><kwd>annular fields</kwd><kwd>spatial spectra</kwd><kwd>focusing</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">Durnin, J. Diffraction-free beams / J. Durnin, J. J. Miceli, Jr., J. H. Eberly // Phys. Rev. Lett. – 1987. – Vol. 58, № 15. – P. 1499–1501. https://doi.org/10.1103/PhysRevLett.58.1499</mixed-citation><mixed-citation xml:lang="en">Durnin J., Miceli J. J., Jr., Eberly J. H. Diffraction-free beams. 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