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Effect of Depolarizing and Quenching Collisions on the Contrast of Coherent Population Trapping Resonance

K.M. Sabakar1, M.I. Vaskovskaya1, D.S. Chuchelov1, E.A. Tsygankov1,*, V.V. Vassiliev1, S.A. Zibrov1, and V.L. Velichansky1,2

  • 1Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia
  • 2National Research Nuclear University MEPhI, Kashirskoye Highway 31, Moscow 115409, Russia

  • *tsygankov.e.a@yandex.ru
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Phys. Rev. Applied 20, 034015 – Published 8 September, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.20.034015

Abstract

We investigate the effect of buffer gases on the coherent population trapping resonance induced by a σ-polarized optical field in 87Rb atoms. Our experimental results show that inert gases, which depolarize the excited state of alkali-metal atoms, provide higher contrast than nitrogen that effectively quenches their fluorescence. We also demonstrate that elimination of spontaneous radiation does not significantly decrease the width at moderate temperatures of an atomic medium. Therefore, a mixture of inert gases can be preferable over a mixture with nitrogen for atomic clocks.

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Phys. Rev. Applied 20, 034015– Published 8 September, 2023
  • Received 3 May 2023
  • Revised 26 July 2023
  • Accepted 16 August 2023
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