对高功率激光器输出耦合镜的受热情况进行了分析,在实际工作模型下设定了圆柱坐标下的热传导方程边界条件.对高功率激光器输出耦合镜所处的物理状态进行了符合实际情况的简化,求得了热传导方程的解析解.对GaAs窗口材料分析了高功率激光器输出耦合镜内部温度分布,在考虑了材料折射率与线膨胀系数随温度变化的因素后,计算了等效光程变化及其引起的热透镜效应.

Heat absorption of high power laser windows is analysed and the heat equation of the window for practical working device and its solving condition are given. Physical state of the high power laser is simplified suitable for the pratical condition. Analytic solution of the heat equation is given. Then the thermal lens effect of high power laser windows is calculated considering the thermal changes of refractive index of the window material and linear expanding index, and the result is disscussed.