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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。
The temperature effect of Yb3 +: YAG lasers was analyzed based on the quasi-three-level rate equation. The results show that the laser energy storage efficiency decreases from 43% to 26% as the temperature of laser medium increases from 300 K to 400 K. The design of cooling the two end faces of the laser sheet by using the thermal conductivity and the excellent diamond window is proposed. The simulation results show that for the doping 11.6% laser with the thickness of 1.2 mm, the maximum temperature should be controlled within the acceptable range (for example, 320 K at a pump power density of 15 kW / cm2 and a repetition frequency of 10 Hz ), The surrounding cooling water convection heat transfer coefficient should not be less than 2 kW / (m2.K). The simulation results also show that under the same thermal power density and cooling conditions, reducing the thickness of the laser while increasing the number of pumping passes can significantly reduce the temperature of the laser.