四能级原子系统中的电磁感应透明及光开关现象

The EIT Effects and Optical Switch of Tripod-type Four-level Atom System

研究了闭合的Tripod-type四能级原子系统,使系统在三模光场相互作用下,利用量子干涉对其进行研究。结果显示在一定条件下,当改变控制场的拉比频率时,探测场对应的介质色散曲线可以实现从反常色散到正常色散的转变,出现了开关效应。并且在一定条件下共振—近共振区域会出现电磁感应透明。

The quantum effects of a tripod-type four-level atom system interacting with three light fileds are studied. Under certain conditions, our calculations show that along with the change of Rabi frequencies of the driving field, the curve of dispersion changes from abnormal chromatic dispersion to normal chromatic dispersion, thus the optical switching effect has appeared. When the parameter is certain, there is a phenomenon of electromagnetic induction transparency in resonance near resonance case.