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

Shi, Yongqi; Scholtes, Theo; Grujić, Zoran D.; Lebedev, Victor; Dolgovskiy, Vladimir; Weis, Antoine

doi:10.1103/PhysRevA.97.013419

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Journal article

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

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