高功率板条放大器冷却系统模拟及优化设计

Modeling and Optimization of Cooling System for High Power Slab Laser Amplifiers

基于传导冷却端面抽运板条激光放大器结构,设计矩形槽微通道水冷热沉作为放大器冷却系统,借助有限元分析(FEA),对微通道热沉尺寸进行了优化,得出槽宽占空比为0.57时热沉冷却性能最好。结合分析结果,设计一槽宽0.4 mm,肋宽0.35 mm的微通道热沉进行实验验证,将实验与模拟结果进行对比拟合得到热沉传热系数与水流速的关系曲线。进一步模拟了激光板条在热沉作用下温度分布情况,得到在水流速很低的情况下板条冷却面具有很小热阻的结果。

Based on conductive cooled slab laser amplifiers with end-pumping structure,a rectangular micro-channel water cooling heatsink as the amplifier cooling system has been designed.Optimization of the micro-channel heatsink was investigated by the finite element analysis（FEA）,which showed that the cooling performance is the best when the ratio of width of microfin valley to width of microchannel is 0.57.Comparing the experiment with the simulation of a micro-channel heatsink with 0.4 mm width of microfin valley and 0.35 mm width of microfin,the curve of heat transfer coefficient and water flow rate was fitted,resultant temperature distribution of the laser slab under cooling of the heatsink was obtained by FEA.Results indicated that low thermal resistance in the slab cooling surface was obtained even the water flow rate was slow.