Inhibition of Two-Photon Absorption in a Four-Level Atomic System with Closed-Loop Configuration  

作　　者：JIN Li-Xia LI Jia-Hua QI Chun-Chao 

机构地区：[1]Department of Physics and National Key Laboratory for Laser Technique, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Communications in Theoretical Physics》2007年第5期916-920,共5页理论物理通讯（英文版）

基　　金：The project supported in part by National Natural Science Foundation of China unde.r Grant Nos. 10634060, 10575040, and 90503010 Acknowledgments The authors would like to thank professor Ying WU for helpful discussion and his encouragement.

摘　　要：We theoretically investigate the features of two-photon absorption in a coherently driven four-level atomic system with closed-loop configuration. It is found that two-photon absorption can be completely suppressed just by properly adjusting the relative phase of four coherent low-intensity driving fields and the atomic system becomes trans- parent against two-photon absorption. From a physical point of view, we explicitly explain these results in terms of quantum interference induced by two different two-photon excitation channels.

关 键 词：two-photon absorption quantum interference closed-loop configuration 

分 类 号：O437[机械工程—光学工程]