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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">pimi</journal-id><journal-title-group><journal-title xml:lang="ru">Приборы и методы измерений</journal-title><trans-title-group xml:lang="en"><trans-title>Devices and Methods of Measurements</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-9506</issn><issn pub-type="epub">2414-0473</issn><publisher><publisher-name>BNTU</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">pimi-216</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>Средства измерений</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Measuring instruments</subject></subj-group></article-categories><title-group><article-title>ПРИБОР ДЛЯ ИЗМЕРЕНИЯ ПАРАМЕТРОВ ТЕРМИЧЕСКОЙ ЛИНЗЫ В ЛАЗЕРНЫХ АКТИВНЫХ ЭЛЕМЕНТАХ МЕТОДОМ ПРОБНОГО ПУЧКА</article-title><trans-title-group xml:lang="en"><trans-title>DEVICE FOR MEASURING OF THERMAL LENS PARAMETERS IN LASER ACTIVE ELEMENTS WITH A PROBE BEAM METHOD</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>Захарова</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Zakharova</surname><given-names>A. N.</given-names></name></name-alternatives><email xlink:type="simple">kyumashev@bntu.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>Лойко</surname><given-names>П. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Loiko</surname><given-names>P. A.</given-names></name></name-alternatives><email xlink:type="simple">kyumashev@bntu.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>Маляревич</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Malyarevich</surname><given-names>A. M.</given-names></name></name-alternatives><email xlink:type="simple">kyumashev@bntu.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>Юмашев</surname><given-names>К. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yumashev</surname><given-names>K. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Адрес для переписки: Юмашев К.В.  Белорусский национальный технический университет, пр. Независимости, 65, 220013, г. Минск, Беларусь e-mail: kyumashev@bntu.by</p></bio><bio xml:lang="en"><p>Address for correspondence: Yumashev K.V. Belarusian National Technical University, Nezavisimosty Ave., 65, 220013, Minsk, Belarus e-mail: kyumashev@bntu.by</p></bio><email xlink:type="simple">kyumashev@bntu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский национальный технический университет</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Belarusian National Technical University</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>09</day><month>12</month><year>2015</year></pub-date><volume>6</volume><issue>2</issue><fpage>127</fpage><lpage>138</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Захарова А.Н., Лойко П.А., Маляревич А.М., Юмашев К.В., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Захарова А.Н., Лойко П.А., Маляревич А.М., Юмашев К.В.</copyright-holder><copyright-holder xml:lang="en">Zakharova A.N., Loiko P.A., Malyarevich A.M., Yumashev K.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://pimi.bntu.by/jour/article/view/216">https://pimi.bntu.by/jour/article/view/216</self-uri><abstract><p>Разработан прибор, предназначенный для измерения параметров термической линзы (ТЛ) в лазерных активных элементах при продольной диодной накачке. Измерения основаны на методе пробного пучка. Прибор позволяет определять знак и оптическую силу ТЛ в главных меридиональных плоскостях, коэффициент чувствительности к изменению поглощенной мощности накачки и степень астигматизма, коэффициент тепловыделения в лазерном материале, что дает возможность оценивать интегральный вклад фотоупругого эффекта в ТЛ, наведенную в лазерном элементе. Измерения проводятся в линейно поляризованном свете на длине волны 0,53 мкм. Накачка активного элемента осуществляется на длине волны 0,96 мкм, что позволяет исследовать лазерные среды, активированные ионами Yb3+ и (Er3+, Yb3+). Точность определения коэффициента чувствительности ТЛ к мощности накачки – 0,1 м-1/Вт, степени астигматизма ТЛ – 0,2 м-1/Вт, коэффициента тепловыделения – 5 %, вклада фотоупругого эффекта в ТЛ– 0,5 ∙10-6 K-1. С помощью данного прибора проведены исследования ТЛ в лазерном активном элементе на основе кристалла иттриевого ванадата Er3+,Yb3+:YVO .</p></abstract><trans-abstract xml:lang="en"><p>We have developed a device for measuring of parameters of thermal lens (TL) in laser active elements under longitudinal diode pumping. The measurements are based on the probe beam method. This device allows one to determine sign and optical power of the lens in the principal meridional planes, its sensitivity factor with respect to the absorbed pump power and astigmatism degree, fractional heat loading which make it possible to estimate integral impact of the photoelastic effect to the formation of TL in the laser element. The measurements are performed in a linearly polarized light at the wavelength of 532 nm. Pumping of the laser element is performed at 960 nm that makes it possible to study laser materials doped with Yb3+ and (Er3+, Yb3+) ions. The precision of measurements: for sensitivity factor of TL – 0,1 m-1/W, for astigmatism degree – 0,2 m-1/W, for fractional heat loading – 5 %, for the impact of the photoelastic effect – 0,5 × 10-6 K-1. This device is used for characterization of thermal lens in the laser active element from an yttrium vanadate crystal, Er3+,Yb3+:YVO .</p></trans-abstract><kwd-group xml:lang="ru"><kwd>термическая линза</kwd><kwd>лазерные активные элементы</kwd><kwd>продольная диодная накачка</kwd><kwd>кристалл иттриевого ванадата</kwd></kwd-group><kwd-group xml:lang="en"><kwd>thermal lensing</kwd><kwd>laser active materials</kwd><kwd>longitudinal diode-pumping</kwd><kwd>yttrium vanadate crystal</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Государственные научно-технические программы, Президент Республики Беларусь</funding-statement><funding-statement xml:lang="en">Belarusian State Scientific and Technical Program, President of Republic of 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">Chenais, S. 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