金刚石窗口冷却Yb3+∶YAG DPSSL设计

针对高功率二极管重复率抽运的V型非稳腔Yb3+∶YAG激光头，提出了利用金刚石窗口冷却和直接水冷相结合的复合冷却设计.在YAG片的抽运面进行直接水冷，同时在激光提取面利用金刚石窗口冷却介质.金刚石优异的导热性能不仅能够有效地冷却激光介质，还能消除横向的温度梯度，解决了高功率激光器冷却和高功率抽运的矛盾.模拟结果表明对掺杂10 at %厚度为1.6 mm的Yb3+∶YAG片在抽运功率密度为20 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约为4000 W/m2K.

Design of a Compact Diamond-Cooled Yb3+:YAG DPSSL

A compact diamond window cooled Yb3+/SUP> ∶ YAG disk laser has been demonstrated. In this cooling scheme,the rear face of disk is cooled directly by water while the front face of disk is applied in good thermal contact to a thin plate of chemical vapor deposition diamond window. The exceptionally good heat conduction properties of diamond can eliminate the temperature gradients perpendicular to laser beam thus previous difficulties with high average power pumping and efficient cooling are resolved. Simulation results show that with a pump intensity of 20 kW/ cm2 and repetition rate of 10 Hz,to keep the maximum temperature of the gain disk below a reasonable value,e. g.,less than 320K,the heat exchange coefficient of water should be about 4000 W/m2 K.