Transient responses of transparency in a far-off resonant atomic system  

作　　者：胡正峰 杜春光 邓见辽 王育竹 

机构地区：[1]The Key Laboratory of Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences [2]Department of Physics,Tsinghua University

出　　处：《Chinese Physics B》2014年第5期292-295,共4页中国物理B（英文版）

基　　金：Project supported by the Knowledge Innovation Program of the Chinese Academy of Sciences and the National Basic Research Program of China

摘　　要：Transient coherent oscillations in a closed A system under far-off resonant Raman fields were investigated theoreti- cally. It has been found that the coherent superposition of the ground states can be formed due to the absorption even for initial maximal mixed ground states. The absorption oscillates with a period depending on the two-photon detuning when the system is initially in a transparent state and the two-photon Raman detuning is suddenly changed. The amplitude of the absorption decays with the decay rate of the ground states, which is different from the case when the lasers are applied resonantly. These transient coherent oscillations can be used to measure the relaxation rate of the ground states.Transient coherent oscillations in a closed A system under far-off resonant Raman fields were investigated theoreti- cally. It has been found that the coherent superposition of the ground states can be formed due to the absorption even for initial maximal mixed ground states. The absorption oscillates with a period depending on the two-photon detuning when the system is initially in a transparent state and the two-photon Raman detuning is suddenly changed. The amplitude of the absorption decays with the decay rate of the ground states, which is different from the case when the lasers are applied resonantly. These transient coherent oscillations can be used to measure the relaxation rate of the ground states.

关 键 词：laser atom interaction coherent population trapping transient coherent oscillation three-level sys-tem 

分 类 号：O562.3[理学—原子与分子物理]