Thermal effect research of the output-coupler window in high power CO2 laser
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摘要: 高功率CO2激光器输出窗不可避免地要吸收谐振腔的激光能量,在其内部产生非均匀温度场的分布,并引起输出窗发生热形变。输出窗的热效应改变了CO2激光器谐振腔的品质因数,影响激光器的稳定性和输出光束的质量。对于输出窗准确的温度场和热形变场研究是解决热透镜效应的关键。利用半解析方法对CO2激光器在TEM00工作模式下,输出窗的温度场及热形变量场进行研究。研究方法和所得结论具有普适性,可以应用到其它具有轴对称性热模型产生的温度场、热形变分析工作中。Abstract: In high power CO2 laser the infrared material output-coupler window inevitable absorbing resonant laser energy will produce non-uniform temperature field distribution,and also cause output coupler window to generate thermal distortion,which is called the output-coupler window thermal effect.Thermal effect would change resonant Q-factor,and influence laser stability and output beam quality.So accurate temperature field and thermal distortion field analysis is the key to resolve these problems.In this article semi-analytical solution is introduced to study output coupler window non-uniform temperature field distribution and thermal distortion field distribution under the CO2 laser operated at stable TEM00 mode.Fortunately the research method and obtained results have universality,which can be applied to analyze temperature field and thermal distortion field with axial symmetry thermal models.
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