Abstract:
We report results of a theoretical and experimental study of the ground state nonlinear Hanle effect under strong laser excitation. It is shown that besides the well-known zero-magnetic field suppression of absorption on F g = F→F e = F - 1 transitions caused by population trapping, an optical pumping induced enhanced absorption occurs on F g = F→F e = F + 1 transitions for small B-fields. The latter effect becomes more pronounced for high F values. The experiment with atomic vapor of Cs (D2 line, F g = 4) confirms an increase of the spectrally unresolved fluorescence yield at zero magnetic field and 600 mW/cm2 laser intensity by 9% or 42%, when excitation occurs with linearly or circularly polarized light, respectively. The results of the experiment agree with numerical simulation studies using equations of motion for a density matrix.
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Received 24 November 2001 / Received in final form 25 March 2002 Published online 24 September 2002
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Papoyan, A., Auzinsh, M. & Bergmann, K. Nonlinear Hanle effect in Cs vapor under strong laser excitation. Eur. Phys. J. D 21, 63–71 (2002). https://doi.org/10.1140/epjd/e2002-00178-y
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DOI: https://doi.org/10.1140/epjd/e2002-00178-y