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为解决百瓦级绿光激光器腔内倍频非线性晶体的热效应问题,以解析分析为基础,研究了谐振腔内多模振荡状态下非线性晶体温度场分布。通过对激光谐振腔内非线性晶体工作特点的分析,建立了腔内多模倍频方形KTP晶体热分析模型,给出了归一化的多模光束分布表达式。利用热传导方程,得到了多模倍频方形非线性晶体温度场一般解析表达式。同时分析了腔内基波功率、多模光斑半径对非线性晶体温度场的影响。研究结果表明:若腔内基频光功率为500 W、束腰半径为200μm的多模光束辐射到方形KTP晶体时,晶体内的最高温升为83.14℃。对于减少百瓦级绿光激光器腔内倍频晶体热效应引起的相位失配,提高百瓦级绿光激光器输出功率具有参考价值。
In order to solve the thermal effect of the nonlinear multiplier nonlinear crystal in a 100-watt green laser, based on the analysis and analysis, the temperature distribution of the nonlinear crystal in the multi-mode oscillation is studied. By analyzing the working characteristics of the nonlinear crystal in the laser cavity, the thermal analysis model of KTP crystal with multimultiplex frequency in the cavity was established, and the normalized multimode beam distribution expression was given. By using the heat conduction equation, the general analytical expression of the temperature field of the nonlinear multiphase nonlinear crystal is obtained. At the same time, the influence of the power of fundamental cavity and the radius of multimode spot on the temperature field of nonlinear crystal was analyzed. The results show that the maximum temperature rise in the crystal is 83.14 ℃ when the multimode laser beams with the fundamental power of 500 W and the beam waist radius of 200 μm radiate into the square KTP crystal. It has a reference value for reducing the phase mismatch caused by the thermal effect of the double frequency crystal in the 100-watt green laser and improving the output power of the 100-watt green laser.