重频50Hz风冷YAG固体激光器热设计及仿真分析

二极管抽运固体激光器的散热问题是激光器能量输出稳定的关键问题。为了解决散热问题, 以激重频50Hz、激光输出能量不小于150mJ的风冷YAG固体激光器为例, 计算了激光器产生的热量, 构建了激光器二极管及散热部件3维模型, 利用FloEFD软件进行热分析, 优化了分析结果并进行了试验验证。结果表明, 循环工作3次后, 激光器输出155mJ、50Hz的激光能量, 激光束散为2.9mard, 散热器的温度约为85℃; 该设计稳定可靠, 可以解决该激光器的散热问题, 以满足激光器各项指标, 保证其正常工作。该研究为激光器更深层次的热设计提供了参考。

The analysis of thermal design and its simulation for air cooled YAG laser with the repetition of 50Hz

Thermal design is the key technology for a diode pump solid laser to keep high stability of the output energy. To solve the cooling problem of a solid laser, a 150mJ air cooled YAG laser with the repetition of 50Hz was systematically studied. The 3-D theoretical model of the diode-pumped laser and the cooling parts was constructed, and the generated heat of the laser was calculated. Further, the thermal management of the whole system was analyzed using the software of FloEFD, and the theoretical results were then discussed. Finally, the verified experiment was carried out. The results show that after three cycles, the laser output is 155mJ, 50Hz, the laser beam dispersion is 2.9mard, and the temperature of radiator is about 85℃, respectively. The thermal design in this study has high stability, with which the cooling problem of the laser can be perfectly solved to meet the final requirements of the system and guarantee the natural work of the laser. This study provides a reference for the further thermal design of laser.