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In this paper we describe an experiment of efficient cooling of $^{87}$Rbatoms in two-frequency diffuse laser lights. Compared with single frequencydiffuse light, two-frequency diffuse lights have wider velocity capture rangeand thus can cool more atoms. In our experiment, the maximum number of cooledatoms can reach up to $3.9\times10^9$. Such a result is quite useful inbuilding a compact cold atom clock.

Enhanced cooling of rubidium atoms in two-frequency diffuse lights