为改善高功率固体激光器的散热性能，以R600a为冷却工质，将制冷系统和喷雾冷却系统相结合，设计了一体化制冷喷雾冷却系统，并进一步研究了热流密度、蒸发压力、喷嘴进口压力对换热性能的影响。实验中在123 W/cm2的热流密度条件下，可保证热沉表面温度低于60 ℃；在喷嘴进口压力350 kPa，蒸发压力185 kPa的条件下换热系数可以达到25000 W/(m2·K)，在热流密度130 W/cm2时，热沉表面温度标准差为2.5 ℃。结果表明，该系统能够获得较低的热沉表面温度、温度分布均匀并且具有较高的换热系数，能够满足高功率固体激光器对散热的需求。

To improve heat-sink performance of the high-power solid-state laser, the refrigeration-spray cooling system was designed by combining the refrigeration cycle and the spray cooling system, and R600a was used as the coolant. The effects of heat flux, evaporation pressure, and nozzle inlet pressure on the heat transfer performance were analyzed by experiment. The heat-sink surface temperature could be kept below 60 ℃ at 123 W/cm2 heat flux. The heat transfer coefficient was obtained up to 25000 W/(m2·K) when the nozzle inlet pressure and the evaporation pressure were 350 and 185 kPa, respectively. And standard deviation of the surface temperature was only 2.5 ℃ when the heat flux was 130 W/cm2. The above results show that the system can get a lower surface temperature, more uniform surface temperature distribution and higher heat transfer coefficient, which can meet the heat removal demand for high-power solid-state lasers.