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薄片激光器热效应及其对输出功率的影响
Analysis of thermal effect and its influence on output power of thin disk laser
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摘要: 建立了光强分布为高斯型的抽运光端面单程抽运时薄片激光器的温度模型，实验测量了不同抽运功率下薄片介质表面的温度分布、温度随时问的变化特性以及介质表面的温度差．采用Hartmann法测量了薄片介质的热焦距．考虑热焦距随抽运功率的变化，基于四能级系统薄片激光器的速率方程组，建立了薄片激光器热效应对输出功率影响的物理模型，薄片激光器输入一输出功率曲线与实际相符．所得结果对薄片激光器的设计和优化具有一定的指导意义．Abstract: A temperature model for a end-pumped thin disk laser with Gaussian beam intensity distribution and single pass absorption performance is built up according to the actual working state. Using infrared thermal image, temperature distribution, temperature variation with time and the temperature difference of the surface laser medium are measured at different pump powers. Experiment on thermal lens focal length of the thin disk laser medium is performed by utilizing Hartmann-Shack wave-front sensor. Considering the fact that thermal lens focal length of the laser medium changes with pump power, the model for analyzing the influence of thermal effect on output power of thin disk laser is presented, according to rate equations. The simulation results obtained in this paper show satisfactory agreement with experimental results. The research has the guiding significance for designing and optimizing thin disk lasers
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