EGAS41 - Swansea University

41 st EGAS CP 203 Gdańsk 2009
Polarization analysis of nonlinear magneto-optical resonances in
87Rb fluorescence
D. Slavov 1 , L. Petrov 1 , M. Balabas 2 , V. Domelunksen 2 , V. Polischuk 2 , G. Todorov 1
1 Institute of Electronics “Acad. Emil Djakov”, Bulgarian Academy of Sciences, 72
Tzarigradsko Chaussee, 1784 Sofia, Bulgaria
2 V.A.Fock Physics Institute, St. Petersburg State University ,198903, Ulyanovskaya 1, St.
Petersburg, Russia
∗ Corresponding author: gtodorov@ie.bas.bg
In the present report we discuss new results obtained using differential scheme of registration
of Coherent Population Trapping [1,2] (CPT) in Hanle configuration in two orthogonal
polarizations [3,4]. This is a nonlinear modification of ground state Hanle effect [3]
observed in the spontaneous emission from the upper level. The ground state coherency
is transmitted from the laser field and as a result higher rank (k) polarization moments
(PM) are created, e.g. octupoles (k = 3) and hexadecapoles (k = 4). The moments
with rank higher than 2 are not directly observable in the spontaneous emission and/or
in transmission. Nevertheless, the laser field conjugates the different components in the
equation evolution and makes the higher rank moments observable. The experimental
results are compared with our theoretical predictions. The theoretical description of the
atomic polarization moment evolution is based on the density matrix formalism specified
for transition transition (F e = 1 → F g = 2) of the Rb D1 line, and the experimental geometry.
Comparing the obtained results it is possible to follow easily the influence of the
different parameters on the observable components and the mutual conversion between
high-rang polarisation moments and quadruple moments.
References
[1] G. Alzetta, A. Gozzini, L. Moi, G. Orriols , Nuovo Cimento B, 36, No 5, 5-20 (1976)
[2] E. Arimondo, Progress in Optics, 35, 257-354 (1996)
[3] E.B. Alexandrov, M.P. Chaika, G.I. Hvostenko, Interference of Atomic States (Springer-
Verlag, 1991)
[4] B. Decomps, M. Dumont, M. Ducloy, in Laser Spectroscopy of Atoms and molecules,
ed H.Walther (Springer-Verleg Berlin, Heidelberg, New York, 380-384 (1976))
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