钠原子系统中三光子跃迁的理论模拟

Theoretical Simulation of Three-Photon Transition in Na Atomic System

利用微扰理论研究了纳原子系统中三光子跃迁过程。该过程涉及到了共振与近共振通道组内和组间的干涉效应。研究了终态布居与激发光场中心波长,带宽以及相位阶跃幅度的关系。研究结果表明,通过光场相位整形技术可以调节干涉的性质,从而实现终态布居的操控。

We study the three-photon transition in Na atomic system by using third-order perturbation theory.This transition involves the intergroup and intragroup interferences between the resonant pathways and near-resonant pathways.We also study the dependence of population of final state on different parameters of the excitation pulses,such as step-phase amplitude,pulse width and central wavelength.It is shown that the interference between different pathways can be manipulated via shaping the phase of the laser pulse,and thus the population of the final state can also be controlled.