双单色经典场驱动下的二能级原子系统

A Two-Level Atom Driven by a Bichromatic Classical Field

本文研究了光与原子相互作用中一种精确可解的模型——频率对称失谐的双单色经典场作用下的一个二能级原子的模型。我们运用半经典Dressed原子态的方法导出了二能级原子的能级平均占有粒子数几率、弱探测光的谱结构及决定谱线强度的相应跃迁几率的解析表达式,通过数值计算,讨论了系统动力学行为随时间(t)、原子与场的失谐量(△)以及半经典Rabi频率(V)的变化规律。结果表明此系统呈现出与单色场二能级原子模型不同的特征。

A exactly solvable model for a two-level atom interacting with a bichromatic classical field with a symmetrical detuning parameter has been studied. By means of the semi-classical dressed-atom state techniques, we have derived the analytic expressions of the mean atomic level occupation probabilities, the structure of the spectrum of a weak probe field and the corresponding transition probabilities which determine the intensities of the spectrum lines for a two-level system. The dependence of the dynamics of the system on the interacting period (t), semi-classical Rabi frequency (V) and detuning(A) between the atom and field has been discussed numerically in detail. The results show that the behavior of the system in the consideration is quite different from that of the model of a two-level atom system interacting with a monochromatic field.