Quantitative study of optical pumping in the presence of spin-exchange relaxation
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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
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Scholtes, Theo
Physics Department, University of Fribourg, Switzerland
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Grujić, Zoran D.
Physics Department, University of Fribourg, Switzerland
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Lebedev, Victor
Physics Department, University of Fribourg, Switzerland
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Dolgovskiy, Vladimir
Physics Department, University of Fribourg, Switzerland
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Weis, Antoine
Physics Department, University of Fribourg, Switzerland
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/306293
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