三能级Λ-系统探测光的频率调制效应研究

The frequency modulation effects of the probe field in three level Λ-system

研究了三能级Λ 系统探测光的频率调制效应 .从经典电子运动方程着手得到介质的极化率 ;从量子角度出发 ,应用Bessel函数将频率调制项展开 ,研究探测光频率调制对系统的影响 .适当调节探测光频率和调制系数 ,得到系统粒子数随时间周期变化的结论 .

In this paper, the frequency modulation effect of the probe field in a three_level Λ system is discussed. According to the classical equation of motion for the electron, the dielectric susceptibility of the medium is not affected by frequency modulation. Based on the quantum theory and the frequency modulation term expanded in terms of Bessel functions, the effects of the frequency modulation of the probe field on the system are studied, in which, when the modulation frequency of the probe field is large enough, the periodical population evolutions exist in three levels. Meanwhile, the stationary susceptibility of the probe field is given.