为了研究准分子宽带抽运碱金属激光器(XPAL)的输出特性，建立了增益介质为Cs-Ar混合气体的五能级XPAL的含时速率方程。使用三角脉冲型抽运，通过模拟计算得出了输出激光能量随输入脉冲抽运能量变化、温度变化、弛豫气体分子浓度变化的曲线图，模型得到的斜率效率和实验数据符合较好。结果表明，其他条件不变的情况下，温度越高，XPAL的阈值和斜率效率越高；弛豫气体分子浓度足够大的时候，D2线激光会消失；XPAL在T=515K附近时效率最高。

In order to studythe output characteristic of the excimer broadband pumped alkali laser (XPAL), the time-dependent rate equationisestablished forthe five-level XPAL, which takes Cs-Ar mixed gas as the gain medium.Using triangle pulse pump, the output laser energy curvesare obtained by simulation when pump pulseenergy, temperature, and concentration of relaxation gas change, and the slope efficiency obtained from the model agrees well with the experimental data.The results show that, the higher the temperature is, the higher the threshold and slope efficiency of the XPAL are, when the other conditionsare fixed;D2 line laser disappears when the concentration of relaxation gas is large enough;and XPAL has the highest efficiency when the temperature is around 515K.