场频率随时间变化对原子偶极压缩效应的影响

Influence of field with a time-varying frequency on atomic dipole squeezing

利用J-C模型,考虑场频率随时间以正弦函数形式作小量变化,在旋波近似下,研究了二能级原子通过单光子跃迁与单模辐射场相互作用系统中原子算符Sy压缩效应的演化规律.利用数值计算方法给出压缩量随时间的演化曲线.研究结果表明:原子算符压缩效应的演化受场频率随时间正弦函数形式变化的调制,场频率振荡的幅值u越大调制作用越强.随场频率变化的幅值u的增大,压缩效应减弱.在场频率振荡的幅值u大于一定值后,压缩量将按场频率周期性的变化规律作周期性振荡,

Using the numerical method in this paper, the atomic dipole squeezing effects in the system of a two-level atom interacting with a light field with a time-varying frequency are studied. The frequency of the field varying with time in the forms of u sin wt has been considered. It is showed that the atomic dipole squeezing effects is influenced by the frequency parameters ω and u of the field varying with time. With the increasing of the value of u, the atomic squeezing effects is decreasing .