Coherent Population Trapping Induced by Phase Modulated and Fluctuating Fields  

作　　者：王剑 胡响明 

机构地区：[1]Department of Physics, Huazhong Normal University, Wuhan 430079

出　　处：《Chinese Physics Letters》2007年第2期424-427,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 60378008 and 10574052.

摘　　要：We examine the effects of cross correlated phase fluctuations on the coherent population trapping （CPT） induced by a pair of phase-modulated fields with equal modulation frequencies in a three-level A system. The maximal coherence of-0.5, which appears when CPT occurs for equal modulation indices, is preserved in the presence of the critically cross-correlated fluctuations. Unexpectedly, the non-maximal coherence, which is established when CPT is obtained for different modulation indices, is significantly enhanced due to the critically cross-correlated fluctuations.We examine the effects of cross correlated phase fluctuations on the coherent population trapping （CPT） induced by a pair of phase-modulated fields with equal modulation frequencies in a three-level A system. The maximal coherence of-0.5, which appears when CPT occurs for equal modulation indices, is preserved in the presence of the critically cross-correlated fluctuations. Unexpectedly, the non-maximal coherence, which is established when CPT is obtained for different modulation indices, is significantly enhanced due to the critically cross-correlated fluctuations.

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分 类 号：O4[理学—物理]