四能级系统中ac-Stark分裂研究

提出一双光场作用下的四能级系统,并对四能级模型的共振荧光谱作了详尽的研究.原子的共振荧光谱随Rabi频率的变化展示出能级的acStark分裂,且在很大参量范围内光谱具有这一特性.但当只有一个激发通道时不产生acStark分裂.在一定的条件下原子的共振荧光谱出现了两条黑线(darkline).可以认为acStark分裂的产生是多通道量子干涉的结果.利用缀饰态理论对acStark分裂给出很好的解释 关键词： 四能级系统模型 ac-Stark分裂 黑线(darkline) 多通道量子干涉

Study on the ac-Stark splitting in a four-level system

We present a model of the four level system driven by double optical fields and investigate the resonant fluorescence spectroscopy in detail. The ac Stark splitting exhibits in the resonant fluorescence spectroscopy from an upper level to lower-lying levels, which occurs over a wide range of the parameters. The ac Stark splitting does not occur when only exists a coherence field. For certain Rabi frequencies, there are double dark lines in the four level system. The generation of ac Stark splitting is the result of the multi channel quantum interference. The origin of the ac\|Stark splitting is explained clearly by the theory of dressed state.