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arXiv:0901.1706 · Physical Review A

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

Wenzhuo Zhang, Hua-Dong Cheng, Liang Liu, Yuzhu Wang

Published May 1, 2009• 13 citations
arXivHTMLPDF

Abstract

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.

DOI
10.1103/physreva.79.053804

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Abstract We demonstrate an integrating sphere to cool 87Rb atoms and measure the recoil-induced resonance and electromagnetically induced absorption spectrum. We measure the relationship between their linewidth and light shift with variation of the detuning and power of the cooling laser and study the performance of the diffuse laser cooling mechanism by the absorption linewidth radio Δν E/Δν R and light shift |Δ R–Δ E| using nonlinear spectroscopy. Specifically, when Δν E/Δν R reaches a value of 1.57, the temperature and number of cold atoms achieve the optimal cooling effect. This characterization of absorption linewidth and light shift will provide a method to estimate whether diffuse light cooling achieves the best cooling effect, contributing to the future development of isotropic laser cooling for application in quantum sensing.
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In this paper we describe an experiment on laser cooling of 87Rb^{87}\mathrm{Rb}87Rb atoms directly from a vapor background in diffuse light. Diffuse light is produced in a ceramic integrating sphere by multiple scattering of two laser beams injected through multimode fibers. A probe beam, whose propagation direction is either horizontal or vertical, is used to detect cold atoms. We measured the absorption spectra of the cold atoms by scanning the frequency of the probe beam, and observed both the absorption signal and the time of flight signal after we switched off the cooling light, from which we estimated the temperature and the number of cold atoms. This method is clearly attractive for building a compact cold atom clock.