在Ker型介质中原子和场的性质

Properties of the Atom and Field in Kerr like Medium

本文研究了在Ｋｅｒｒ型介质腔中经历双光子辐射的二能级级联型原子和三能级级联型原子的动力学，在初始相干态下分别用有效哈密顿量方法（含Ｓｔａｒｋ位移项）和全哈密顿量方法获得精确解。继而比较了原子的粒子数反转、光子统计分布、聚束与反聚束特性以及光场压缩特性的数值结果，由此证明了在非线性介质的条件下，两种方法所获得结果类同。

The dynamics of the two level and three level cascade atoms undergoing two photon transistions are investigated in the cavity filled with Kerr like medium. The problems are solved exactly in the presence of an initial coherent state field using EHA with the Stark-shift parameters and THA, respectively. Comparing the numerical results of atomic population inversion, photon probability distribution, bunching and antibunching characteristics and squeezing, we have shown that the two approaches exhibit similar behaviors with a little difference under the condition of nonlinear field.