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Journal of Experimental and Theoretical Physics

Polarization effects in recoil-induced resonances

Д. Б. Лазебный, Denis V. Brazhnikov, А. В. Тайченачев, Valeriy I. Yudin

Published Jan 1, 2017• 0 citations
Publisher

Abstract

The effect of the field polarization on the amplitude of recoil-induced resonances (RIRs) is considered for laser-cooled free atoms and for atoms in a working magneto-optical trap (MOT). For all closed dipole transitions, explicit analytical expressions are obtained for the polarization dependence of the resonance amplitudes within a perturbation theory. Optimal polarization conditions are found for the observation of resonances.

DOI
10.1134/s1063776116130161

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The effect of the field polarization on the amplitude of recoil-induced resonances (RIRs) is considered for laser-cooled free atoms and for atoms in a working magneto-optical trap (MOT). For all closed dipole transitions, explicit analytical expressions are obtained for the polarization dependence of the resonance amplitudes within a perturbation theory. Optimal polarization conditions are found for the observation of resonances.
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A model of the formation of recoil-induced resonances accompanying the interaction of an ensemble of slow atoms with a pair of plane light waves with different polarizations is constructed in the framework of the semiclassical approach to the description of the angular momentum of atoms. The approach used reduces the problem to the description of the resonances in the effective model of atoms with nondegenerate levels. The resonance amplitudes exhibit a strong dependence on the type of model used (with or without the inclusion of the degeneration of levels) and on the polarization of light waves. At the same time, the shape of the resonances that is normalized to unit amplitude from which the velocity distribution of atoms can be reconstructed is much less sensitive to the model type.
In this paper we report an experiment on the observation of the recoil-induced resonances (RIR) and electromagnetically induced absorption (EIA) of cold 87Rb^{87}\text{R}\text{b}87Rb atoms in diffuse light. The pump light of the RIR and the EIA comes from the diffuse light in an integrating sphere, which also serves the cooling light. We measured the RIR and the EIA signal varying with the detuning of the diffuse laser light, and also measured the number and the temperature of the cold atoms at the different detunings. The mechanism of RIR and EIA in the configuration with diffuse-light pumping and laser probing are discussed, and the difference between the nonlinear spectra of cold atoms in a diffuse-light cooling system and in a magneto-optical trap is studied.