延迟双色光场中缀饰态粒子选择性布居条件的理论研究

Condition of selective population of dressed states of the excited state under dichromatic fields

利用微扰理论与缀饰态理论,采用光子回波处理方法,研究了延迟双脉冲光场作用下二能级系统的粒子跃迁过程,求解哈密顿方程得出了激发态和激发态的两个缀饰态的粒子布居概率振幅.理论研究结果表明,激发态的两个缀饰态的粒子布居概率是由第一个脉冲光场的面积以及两个光场之间的延迟时间共同决定的;调控第一个脉冲的面积和两个激发光场的延迟时间,可以对二能级系统激发态的两个缀饰态的粒子布居概率进行调制,从而实现粒子在两个缀饰态上的选择性布居.

The transition process in a two-level atomic system is studied by using the derturbation theory and the dressed state theory with photon echo processing method.The population probabilities of the excited state and its two dressed states are obtained by solving the Hamiltonian equation.The results show that the probabilities of the dressed states are related to the area of the first excited pulse and the delay-time between the two excited fields.Therefore,the selective population of the dressed states can be realized by controlling the area of the first pulse field or the delay time between the two excited fields.