https://doi.org/10.1140/epjd/e2002-00178-y
Nonlinear Hanle effect in Cs vapor under strong laser excitation
1
Institute for Physical Research, NAS of Armenia, Ashtarak-2 378410, Armenia
2
Department of Physics, University of Latvia, 19 Rainis boulevard, Riga 1586, Latvia
3
Fachbereich Physik, Universität Kaiserslautern, 67653 Kaiserslautern, Germany
Corresponding author: a papoyan@ipr.sci.am
Received:
24
November
2001
Revised:
25
March
2002
Published online:
24
September
2002
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 transitions caused by population trapping,
an optical pumping induced enhanced absorption occurs on
transitions for small B-fields. The
latter effect becomes more pronounced for high F values. The experiment
with atomic vapor of Cs (D2 line,
) 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.
PACS: 32.80.Bx – Level crossing and optical pumping / 32.80.Qk – Coherent control of atomic interactions with photons / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002