高功率高重复频率全固态激光器热透镜效应补偿与分析
Study on compensation of thermal lens in high power high repetition solid-state laser
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摘要: 将kHz高功率固体激光器增益介质当作厚透镜处理，建立了热透镜效应分析的理论模型，使用矩阵的方法对等效热透镜腔进行分析。对增益介质抽运均匀性进行了改善，通过分析模拟计算结果，设计了混合非稳腔结构，选择了最佳凸面镜曲率半径对热透镜效应进行补偿。试验结果表明，补偿效果明显，kHz高功率全固态激光器的光束发散角优于1.3 mrad。Abstract: A model which treated the active medium as a thick lens was established to analyze the effects of thermal lens in the resonator. By using the matrix method, the equivalent resonator performance was studied. The uniformity of pump energy distribution was improved. An unstable plane-convex resonant cavity with special parameters was designed based on the calculation result of thermal lens compensation. The optimum radius of the rear convex mirror was presented which could efficiently compensate the effect of thermal lens. A beam divergence less than 1.3 mrad was achieved.
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Key words:
- high power solid-state laser /
- thick lens /
- compensation of thermal effect
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