强laser与二能级原子相互作用：偶极跃迁的WKB表达式和population inversion
Intense laser interacting with a two level atom: WKB expressions for dipole transitions and population inversion
摘要：
在以前的文章中，我们已经考虑了由二能级原子与相干外电磁场相互作用组成的系统。旋转波近似法从未被应用过。由于对强激光场情况下的高次谐波产生问题特别感兴趣，我们在这封信中提出了一种更有效的方法来获得这些解，并在参数取极值的范围内进行了一些计算。此外，形式主义现在允许我们提供在WKB制度的电偶极矩和粒子数反转的解析表达式。频谱可以分解为周期性和非周期性的贡献。只有后者取决于Floquet指数，可以负责的主要复杂性所观察到的拉比复苏和超拉曼位移。
英文摘要：
In a previous paper, we have already considered the system composed by a two level atom interacting with a coherent external electromagnetic field. No application whatsoever has been made of the rotating wave approximation. Being specially interested in the problem of higher harmonic generations for the case of very intense laser fields, we have developed in this letter a much more efficient way to obtain these solutions as well as to carry out some calculations in a range in which the parameters take extreme values. Also the formalism allows us now to provide analytic expressions in the WKB regime for the electric dipole moment and the population inversion. The spectrum can be decomposed in periodic and non-periodic contributions. Only the latter depends upon the Floquet exponent and can be responsible of the main complexities of the observed Rabi revivals and the hyper-Raman shift.
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