Sr离子自终止和复合激光交替振荡的动力学模型

A kinetics model for alternate oscillation of self-terminating and recombination lasers in strontium ions

建立了一个反映高重复率脉冲放电激励的Sr离子自终止激光和复合激光交替振荡的动力学模型,得到了与实测光电脉冲波形相一致的模拟结果.给出了He-Sr放电等离子中长寿命粒子、激光上下能级粒子数密度和电子温度随时间的演化过程.分析了两种激光交替振荡的发射过程、脉冲宽度特性和粒子数反转机理,认为在放电早期和余辉期电子温度的急剧升高和降低是Sr离子自终止和复合激光实现交替振荡的关键所在.

A self-consistent model has been developed to simulate the kinetics of alternate oscillation of self-terminating and recombination lasers in univalent ions of strontium excited by high-repetition-rate pulsed discharge. Photoelectric pulse waveforms predicted by the model are in good agreement with the experimental measurement. Temporal behaviors of long-life particles, the upper and the lower level poplulations and the electron temperature in He-St discharge plasma are given by the model. The emission process of the two laser alternate oscillation, the characteristic of the laser pulse width and the population inversion mechanics are also analyzed. It is presumed whether the electron temperature can rise up quickly in the early discharge and fall down rapidly during the discharge afterglow is the key to realize the alternate oscillation of self-terminating and recombination lasers in univalent ions of strontium in experiment.