高功率二极管泵浦模块热效应补偿研究
Research of thermal effects compensation of high power diode laser module
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摘要: 分析了作为放大器应用的高功率二极管泵浦模块Nd:YAG圆棒的热效应，包括热透镜效应和热致双折射所引起的退偏效应及其补偿方法。在光路中加入合适的负透镜可以对特定工作条件下激光棒的热透镜进行较好的补偿；使用两个增益和荧光分布等参数完全一致的泵浦模块作为放大级，在其间加入90°石英旋转片和4F像传递系统可以较好的补偿热致双折射所引起的退偏效应。并且对以上方法进行了实验验证，取得了良好的补偿效果，提高了泵浦模块的提取效率和激光输出功率。Abstract: Thermal effects such as the thermally induced lens and thermally induced birefringence of the laser rod pumped by high power LD in laser amplifier and their compensations were discussed. Minus lenses can make good compensation for the thermally induced lens of the laser rod. The depolarization loss caused by the birefringence is reduced with a 90°quartz rotator and imaging relay optical system between two similar laser modules. Both of the output power and the efficiency of laser are improved in experiment.
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