Yb3+:YAG片状激光器的温度效应及金刚石窗口冷却设计
Temperature effect of Yb3+:YAG slab laser and diamond window cooling design
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摘要: 基于准三能级速率方程分析了Yb3+:YAG 片状激光器的温度效应，结果表明随着激光介质的温度由300 K升高到400 K，激光器的储能提取效率由43%下降到26%。提出了利用热传导性能及优异的金刚石窗口对激光片的两端面进行冷却设计。模拟结果表明对掺杂11.6 %厚度为1.2 mm的激光片在泵浦功率密度为15 kW/cm2，重复频率为10 Hz的条件下，要将最高温度控制在可接受的范围内（比如320 K），周围冷却水的对流换热系数不应小于2 kW/(m2·K）。模拟结果还表明，在相同的热功率密度和冷却条件下，减小激光片的厚度同时增加抽运光的传输次数可以明显的降低激光片的温度。Abstract: The temperature-related laser performances of the Yb3+:YAG slab laser have been investigated based on quasi-three level rate equation model, which include the energy storage and extraction efficiency. The results show that the extractable energy storage efficiency decreases significantly from 43% to 26% with the increase of the temperature in the lasing slab from 300 to 400 K. We also have demonstrated the feasibility of double-face cooling of lasing slab with a diamond window whose thermal conductivity is so high that a very thin plate suffices to efficiently remove the heat generated in the lasing slab. Simulation results show that with a pump intensity of 15 kW/cm2 and repetition rate of 10 Hz, to keep the maximum temperature of the lasing slab below a reasonable value, e.g., less than
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