Cesium alignment produced by pumping with unpolarized light

  • Yongqi Shi
  • Antoine Weis
Regular Article


We demonstrate optical pumping on the four hyperfine components of the Cs D1 transition by unpolarized (UPL) resonant laser light. The evidence is based on the reduction of the absorption coefficients κ0 with increasing light power P in an uncoated Cs vapor cell with isotropic spin relaxation. For comparison we perform the same quantitative κ0(P) measurements with linearly-polarized light (LPL) and circularly-polarized light (CPL). We find that our previously published algebraic expressions give an excellent description of all experimentally recorded induced transparency signals. Based on this we can make reliable absolute predictions for the power dependence of the spin orientation and alignment produced by pumping with LPL, CPL and UPL.

Graphical abstract


Atomic Physics 

Supplementary material


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© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Physics Department, University of FribourgFribourgSwitzerland
  2. 2.Institute of Electronics, Chinese Academy of SciencesBeijingP.R. China
  3. 3.University of Chinese Academy of SciencesBeijingP.R. China

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