Sr原子M-M跃迁激光的动力学模型

建立了一个反映高频脉冲放电激励的Sr原子M-M跃迁激光的动力学模型，阐明了各激光谱线上能级的主要抽运途径：其中301μm上能级是在放电脉冲早期通过更高能级的自发辐射和激光跃迁得到布居，而另3条谱线的上能级主要是通过余辉期一价Sr离子和电子的碰撞复合以及He和三重态Sr原子的混和碰撞实现布居.定量的计算结果与实验测量结果相一致，圆满解释了各种光脉冲的时间延迟关系.关键词：锶原子激光M-M跃迁动力学模型

A kinetics model for metastable-metastable transition laser in Sr atom vapor

A self-consistent physical model has been developed to simulate the kinetics in a high-repetition frequency, discharge-excited Sr atom metastable-metastable transition laser. The main pumping mechanism for each upper laser level has bee n clarified: the upper level of 301μm is pumped mainly by the spontaneous and stimulated emissions from the higher levels in early discharge pulses, while th e upper levels of the other 3 laser lines are chiefly populated through the reco mbination between the univalent Sr ions and electrons in the afterglow, and the collision mixing between neutral He and Sr atoms in compound triplet. The quant itative results predicted by the model are found to be in good agreement with th e previous experimental results. Furthermore, the temporal behavior of each lase r pulse is explained successfully by the simulation results.