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Chinese Optics Letters

积分球内漫散射光对铷87原子冷却的装载过程研究

Ling Xiao, Xucheng Wang, Wenzhuo Zhang, Hua-Dong Cheng, Liang Liu, Yuzhu Wang

Published Jan 1, 2010• 6 citations
Publisher

Abstract

Cold 87 Rb atom's loading in an integrating sphere with diffuse light is analyzed theoretically and experimentally.The experimental results show that diffuse light cooling has the greatest efficiency to cool the most atoms when the red detuning between the frequencies of cooling light and atom transition is about 3.3Γ (Γ is the natural linewidth, 6.065 MHz).Theoretical analysis using rate equation and numerical calculations on the cold atom number and loading time agree with the experimental results.This integrating sphere cooling would be a novel method for cooling atoms and lead to a new and robust cold atom source for atomic clock.

DOI
10.3788/col20100803.0253

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Physical Review A•Feb 5, 2009•38 citations
Cold 87 Rb atom's loading in an integrating sphere with diffuse light is analyzed theoretically and experimentally.The experimental results show that diffuse light cooling has the greatest efficiency to cool the most atoms when the red detuning between the frequencies of cooling light and atom transition is about 3.3Γ (Γ is the natural linewidth, 6.065 MHz).Theoretical analysis using rate equation and numerical calculations on the cold atom number and loading time agree with the experimental results.This integrating sphere cooling would be a novel method for cooling atoms and lead to a new and robust cold atom source for atomic clock.
Cold 87Rb atom's loading in an integrating sphere with diffuse light is analyzed theoretically and experimentally. The experimental results show that diffuse light cooling has the greatest efficiency to cool the most atoms when the red detuning between the frequencies of cooling light and atom transition is about 3.3\Γ (Γ is the natural linewidth, 6.065 MHz). Theoretical analysis using rate equation and numerical calculations on the cold atom number and loading time agree with the experimental results. This integrating sphere cooling would be a novel method for cooling atoms and lead to a new and robust cold atom source for atomic clock.
In this paper we describe an experiment of efficient cooling of 87^{87}87Rb atoms in two-frequency diffuse laser lights. Compared with single frequency diffuse light, two-frequency diffuse lights have wider velocity capture range and thus can cool more atoms. In our experiment, the maximum number of cooled atoms can reach up to 3.9×1093.9\times10^93.9×109. Such a result is quite useful in building a compact cold atom clock.
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.