时间耦合对光场聚束与反聚束效应的影响

Influence of Time-dependent on Bunching and Antibunching Effects of Light Field

在旋波近似下,研究了依赖于时间和强度耦合的Jaynes—Cummings模型.此模型是为了反映原子与光场的耦合程度对时间的依存关系,将原子与光场以时间脉冲的形式耦合起来,使其更接近实际.通过此模型的任意时刻的态矢求解出光场的二阶关联函数,并讨论了原子与光场的耦合受到高斯型时间脉冲限制时,脉冲宽度和光强强度对光场二阶关联函数的影响.结果表明,在此模型下可以通过改变脉冲宽度有效地控制光场的聚束或反聚束程度.

The time-dependent and intensity-dependent Jaynes-Cummings model are investigated under the rotating wave approximation. We consider the case that the coupling extent of atom and light field is dependent on time in order to close to the fact. By the system＇s vector at any time t, we can calculate the second-order correlation function of light field. The evolution the second-order correlation function of light field is discussed in the case of different widths of pulse. Here the time pulse we chose is Gaussian shape. The results show that the time-evolution of second-order correlation function in this model is different from other intensity-dependent models, and that we can control the degree of bunching and anti-bunching effectively by controling the pulse width.