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为解决高功率 CO_2激光器高反膜红外耦合窗吸收谐振腔内激光能量产生热效应问题,通过对红外耦合窗镀膜参数和工作特性分析,建立了红外耦合窗的热模型。对热传导方程及其边界条件利用半解析热分析方法得出 TEM_(01)~*(TEM_(01)+TEM_(10))模式的 CO_2激光器红外耦合窗的温度场和热形变计算式,并且对影响红外耦合窗内温度分布的因素进行分析和讨论,发现热模型更符合实际激光器系统,而且 TEM_(01)~*(TEM_(01))+TEM_(10))模式在工业领域的应用很广泛,因此对此模式的研究具有重要的实际意义。
In order to solve the thermal effect of the laser energy absorption in the high reflective infrared coupling window of a high power CO 2 laser, a thermal model of the infrared coupling window is established by analyzing the parameters and operating characteristics of the infrared coupling window. The temperature field and thermal deformation of CO_2 laser with TEM_ (01) ~ * (TEM_ (01) + TEM_ (10)) mode were obtained by semi-analytical thermal analysis of heat conduction equation and its boundary conditions. The factors influencing the temperature distribution in the infrared coupling window are analyzed and discussed. It is found that the thermal model is more in line with the actual laser system, and the TEM_ (01) ~ (TEM_ (01)) + TEM_ (10) Therefore, the research on this model has important practical significance.