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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">12841</article-id><article-id pub-id-type="doi">10.31857/S0869-56524853281-284</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Physics</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Физика</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Temperature measurements of optically cooled calcium atoms using differential two-photon spectroscopy</article-title><trans-title-group xml:lang="ru"><trans-title>Измерение температуры оптически охлаждённых атомов кальция с использованием метода дифференциальной двухфотонной спектроскопии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bobrov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Бобров</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vilshanskaya</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Вильшанская</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Arshinova</surname><given-names>I. D.</given-names></name><name xml:lang="ru"><surname>Аршинова</surname><given-names>И. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Saakyan</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Саакян</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sautenkov</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Саутенков</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zelener</surname><given-names>B. V.</given-names></name><name xml:lang="ru"><surname>Зеленер</surname><given-names>Б. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fortov</surname><given-names>V. E.</given-names></name><name xml:lang="ru"><surname>Фортов</surname><given-names>В. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Academician of the RAS</p></bio><bio xml:lang="ru"><p>Академик РАН</p></bio><email>eva.villi@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Joint Institute for High Temperatures of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Объединённый институт высоких температур Российской Академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-05-21" publication-format="electronic"><day>21</day><month>05</month><year>2019</year></pub-date><volume>485</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>281</fpage><lpage>284</lpage><history><date date-type="received" iso-8601-date="2019-05-22"><day>22</day><month>05</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-05-22"><day>22</day><month>05</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian academy of sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/12841">https://journals.eco-vector.com/0869-5652/article/view/12841</self-uri><abstract xml:lang="en"><p>A differential two-photon method of measuring the temperature of <sup>40</sup>Ca atoms in a continuously operating magneto-optical trap is demonstrated. Coherent two-photon resonances at the 4<italic>s</italic><sup>2 1</sup><italic>S</italic><sub>0</sub>-50 <sup>1</sup><italic>S</italic><sub>0</sub> Rydberg transition have been investigated experimentally using resonance laser beams propagating at different angles. The tempera­ture of the cloud of <sup>40</sup>Ca atoms was measured depending on the frequency detuning of the cooling laser radiation.</p></abstract><trans-abstract xml:lang="ru"><p>Продемонстрирован дифференциальный двухфотонный метод измерения температуры атомов <sup>40</sup>Ca в непрерывно работающей магнитооптической ловушке. Экспериментально исследованы когерентные двухфотонные резонансы на ридберговском переходе 4<italic>s</italic><sup>2 1</sup><italic>S</italic><sub>0</sub>-50 <sup>1</sup><italic>S</italic><sub>0</sub> с использованием резонансных лазерных пучков, распространяющихся под разными углами. Была измерена температура облака атомов <sup>40</sup>Са в зависимости от отстройки частоты охлаждающего лазерного излучения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>magneto-optical trap</kwd><kwd>Rydberg atoms</kwd><kwd>two-photon spectroscopy</kwd><kwd>spectral broadening</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>магнитооптическая ловушка</kwd><kwd>ридберговские атомы</kwd><kwd>двухфотонная спектроскопия</kwd><kwd>уширение спектра</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Honda K., Takahashi Y., Kuwamoto T., et al. // Phys. Rev. A. 1999. V. 59. № 2. P. 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