A Modified Method of Faraday Rotation for Investigation of Atomic Lines of Rubidium and Potassium in Ultrathin Cells


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Abstract

A nanocell filled with atomic vapors of rubidium and potassium was used to develop a modified method of Faraday rotation. The formed lines are characterized by a spectral width that is a factor of 1.5‒2 smaller than those obtained by traditional method of Faraday rotation in nanocells. The new method allows obtaining the spectral width of atomic line that is 8 times smaller than the Doppler broadening in the case of the D2 line of rubidium and 15 time smaller than the Doppler broadening in the case of the D1,2 lines of potassium. In magnetic fields B = 100−1200 G, all atomic lines of Rb and K atoms are spectrally resolved and identified. In the case of the D2 line of Rb, it is demonstrated that the probabilities of magneto-induced transitions (87Rb, Fg = 1 → Fe = 3 and 85Rb, Fg = 2 → Fe = 4) can exceed the probabilities of the allowed transitions. Convenience and efficiency of the modified method of Faraday rotation for high-resolution spectroscopy is demonstrated.

About the authors

A. Sargsyan

Institute for Physical Research, National Academy of Sciences of Armenia

Author for correspondence.
Email: tigran.vartanyan@mail.ru
Armenia, Ashtarak, 0203

A. Amiryan

Institute for Physical Research, National Academy of Sciences of Armenia; Laboratoire Interdisciplinaire Carnot de Bourgogne, Université Bourgogne-Franche-Comté

Email: tigran.vartanyan@mail.ru
Armenia, Ashtarak, 0203; Dijon Cedex, 21078

T. A. Vartanyan

ITMO University

Author for correspondence.
Email: tigran.vartanyan@mail.ru
Russian Federation, St. Petersburg, 197101

D. Sarkisyan

Institute for Physical Research, National Academy of Sciences of Armenia

Email: tigran.vartanyan@mail.ru
Armenia, Ashtarak, 0203

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