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为了解决大功率CO2激光器输出窗热效应问题,以解析分析为基础,研究了混合模式振荡下输出窗的温度场以及热形变分布情况。通过CO2激光器大功率运转时腔内振荡模分布特点的分析,给出了腔内混合模光束光强分布解析表达式。并依据输出窗工作特点分析,建立了热分析模型,利用热传导方程推导出了温度场的一般通解表达式,然后分析了腔内激光功率对输出窗温度场的影响。同时定量计算了不同材料输出窗的温度场以及热形变情况。研究结果表明:若CO2激光器腔内混合模光束功率为4500W,腰斑半径为450μm时,Zn Se窗的最高温升为53.9℃,最大热形变量为2.1μm。研究方法和所得结论具有普适性,可用于其他激光器腔内混合模式振荡状态下的热问题研究中。
In order to solve the thermal effect of the output window of a high power CO2 laser, the temperature field and the distribution of thermal deformation in the output window under mixed mode oscillation were studied based on the analysis and analysis. By analyzing the distribution characteristics of intracavity oscillation modes during high power CO2 laser operation, an analytical expression of the intensity distribution of the mixed cavity laser beam is given. Based on the analysis of the operating characteristics of the output window, a thermal analysis model was established. The general general solution of the temperature field was deduced by using the heat conduction equation. Then the influence of laser power on the temperature field of the output window was analyzed. At the same time, the temperature fields of the output windows of different materials and the thermal deformation were calculated quantitatively. The results show that the maximum temperature rise of Zn Se window is 53.9 ℃ and the maximum thermal deformation is 2.1μm when the power of the mixed laser beam in a CO2 laser is 4500W and the waist radius is 450μm. The research methods and the conclusions obtained are universal and can be used in the research of thermal problems under mixed mode oscillation in other laser cavity.