论文部分内容阅读
报道了不同热边界和泵浦结构下激光晶体的热效应情况。理论上,基于星载激光器的工作特点,通过建立符合激光晶体工作状态的热模型,模拟了Nd:YAG晶体受到具有高斯分布半导体激光侧面泵浦时的温度场分布,分析了热边界、泵浦方式以及泵浦光斑、吸收系数等泵浦参数对温度场的影响。将激光晶体热透镜作薄透镜近似,进行了热透镜焦距理论计算和实验测量。五面环形泵浦结构,泵浦功率4 500 W,10 Hz重复频率下,Nd:YAG晶体的热透镜焦距约9.5 m,实验结果与理论仿真结果基本符合。文中建立的模型与实验方法为预测激光晶体的热效应提供了一种有效工具,为激光器设计提供依据。
The thermal effects of laser crystals under different thermal boundaries and pump structures are reported. In theory, based on the working characteristics of the satellite laser, the temperature field distribution of the Nd: YAG crystal under side-pumping with Gaussian distributed semiconductor laser is simulated by establishing a thermal model that conforms to the working state of the laser crystal. The thermal boundary, Mode and pump spot, absorption coefficient and other pump parameters on the temperature field. The laser crystal thermal lens is approximated as a thin lens, and theoretical calculation and experimental measurement of thermal lens focal length are carried out. The results show that the thermal lens focal length of Nd: YAG crystal is about 9.5 m at a pump power of 4 500 W and a repetition frequency of 10 Hz. The experimental results are in good agreement with the theoretical simulation results. The model and experiment method established in this paper provide an effective tool for predicting the thermal effect of laser crystal and provide the basis for laser design.