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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Effects of polarization on recoil-induced resonances of rubidium atoms in diffuse laser light

Wenli Wang, Jun Qian, Jianliao Deng, Yuzhu Wang

Published May 1, 2014• 0 citations
Publisher

Abstract

We develop a novel approach for investigating the recoil-induced resonance (RIR) of cold atoms in diffuse laser light, which based on the semi-classical description of the atomic angular momentum. This approach simplifies the calculations of density-matrix equations in the complicated situation of atom-photon interactions and reveals a remarkable signature of the polarization effect on recoil-induced pumpprobe spectroscopy.

DOI
10.1109/fcs.2014.6859952

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We develop a novel approach for investigating the recoil-induced resonance (RIR) of cold atoms in diffuse laser light, which based on the semi-classical description of the atomic angular momentum. This approach simplifies the calculations of density-matrix equations in the complicated situation of atom-photon interactions and reveals a remarkable signature of the polarization effect on recoil-induced pumpprobe spectroscopy.
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.
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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.
The recoil-induced resonance spectrum of cold rubidium atoms in an integrating sphere is theoretically analyzed and experimentally observed. We propose a unified theoretical model for arbitrary light polarizations and degenerate magnetic sublevels to calculate the spectra. The amplitude and width of the recoil-induced resonance signals are measured, and the data agree well with our theory. Moreover, the recoil-induced resonance spectroscopy is also used to extract the temperature of the atoms in the integrating sphere. In contrast to the conventional time-of-flight method, a falling region and an auxiliary chamber for the detection are not required, which can be beneficial in building a compact integrating sphere clock. The technique provides a powerful spectroscopic tool for nondestructively monitoring and improving the performance of the integrating sphere atomic clocks.