We study experimentally the effect of diffusion of Rb atoms on electromagnetically induced transparency (EIT) in a buffer gas vapour cell. In particular, we find that diffusion of atomic coherence in and out of the laser beam plays a crucial role in determining the EIT resonance lineshape and the stored light lifetime.

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Observation of recoil-induced resonances and electromagnetically induced absorption of diffuse light by cold atoms

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Optics Communications

Gas diffusion induced by resonance light field

A.D. Antsigin, Sergey Nikitich Atutov, Faris Gel’mukhanov, Anatolii M. Shalagin, G. G. Telegin

Published Feb 1, 1980• 23 citations

Publisher

DOI: 10.1016/0030-4018(80)90115-7

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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

^{87}\text{R}\text{b}

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.