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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 kinetic model was established to reflect the alternation of self-terminated Sr and self-terminated laser beams with high repetition rate pulsed discharge, and the simulation results agreeing with those of the measured photo-electric pulse were obtained. Particle, the number density of the upper and lower laser energy levels and the evolution of the electron temperature over time are analyzed.The emission process, the pulse width characteristics and the particle number inversion mechanism of the two kinds of laser oscillation are analyzed. It is considered that in the early and late discharge phase electron temperature is abrupt Raising and lowering are the key points for Sr ion self-termination and compound laser to achieve alternating oscillation.