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Quantitative study of optical pumping in the presence of spin-exchange relaxation

  • Shi, Yongqi Physics Department, University of Fribourg, Switzerland - University of Chinese Academy of Sciences, Beijing, China - Institute of Electronics, Chinese Academy of Sciences, Beijing, China
  • Scholtes, Theo Physics Department, University of Fribourg, Switzerland
  • Grujić, Zoran D. Physics Department, University of Fribourg, Switzerland
  • Lebedev, Victor Physics Department, University of Fribourg, Switzerland
  • Dolgovskiy, Vladimir Physics Department, University of Fribourg, Switzerland
  • Weis, Antoine Physics Department, University of Fribourg, Switzerland
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    24.01.2018
Published in:
  • Physical Review A. - 2018, vol. 97, no. 1, p. 013419
English We have performed quantitative measurements of the variation of the on-resonance absorption coefficients κ0 of the four hyperfine components of the Cs D1 transition as a function of laser power P, for pumping with linearly and with circularly polarized light. Sublevel populations derived from rate equations assuming isotropic population relaxation (at a rate γ1) yield algebraic κ0(P) dependences that do not reproduce the experimental findings from Cs vapor in a paraffin-coated cell. However, numerical results that consider spin-exchange relaxation (at a rate γse) and isotropic relaxation fit the experimental data perfectly well. The fit parameters, viz., the absolute value of κ0, the optical pumping saturation power Psat, and the ratio γse/γ1, are well described by the experimental conditions and yield absolute values for γ1 and γse. The latter is consistent with the previously published Cs-Cs spin-exchange relaxation cross section.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/306293
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