中文摘要：

用微扰论方法计算了光与双Λ原子系统相互作用的有效哈密顿量,计算结果表明,在考虑到二阶微扰项的情况下,有效哈密顿量合理地解释了拉曼过程所产生的非线性效应,从而可用于分析原子非线性引起的非经典效应随泵浦场的拉比频率、泵浦场失谐的变化关系。

英文摘要：

In this paper, the effective Hamiltonian of a doub perturbation to second order, which can be used to discuss th leading to the nonclassical effect. Therefore the dependence of le A-type atomic system is calculated via the e nonlinear process of the Raman interaction, nonclassical on rabi frequency and detuning of pump fields can be easily found.