基于热流固多物理场耦合模型，仿真分析了高功率大口径薄片激光器冷却和抽运过程中的流动、对流扩散和热传导过程，对冷却液流场分布和工作物质温度场分布进行了分析，研究了抽运功率、冷却液流速对激光工作物质温度场分布的影响。仿真结果表明：冷却液流动、热传导和对流扩散引起冷却液温度在流动方向上逐渐升高，激光工作物质的温度在冷却液流动方向呈非对称分布，对称轴上的最高温度点在冷却液流动方向偏离激光工作物质轴心。激光工作物质在冷却液流动方向的对称轴的入口段与出口段的温差随抽运功率呈线性变化，随冷却液流速呈非线性变化。实验测量结果与模拟结果相一致。

Based on the heat-fluid-solid multiphysics coupling method, the fluid flow, convective diffusion and thermal conduction, which occur in the pumping and cooling processes of high power disk-type laser, are simulated and analyzed. Influences of pumping power and fluid flowing velocity on the temperature distribution of disk gain medium are studied. Simulation results reveal that the temperature of cooling fluid gradually increases in the fluid flowing direction under the interaction of flowing, heat conduction and convective diffusion. Temperature distribution of the laser gain medium is asymmetrical in the direction of fluid flowing direction. The highest temperature position on the flowing direction is shifted from the axis of gain medium. A linear variation of temperature differences on the flowing direction of gain medium between the inlet and outlet is showed with the pump power increasing. A nonlinear variation of temperature difference on the flowing direction of gain medium between the inlet and outlet is showed with the fluid flowing velocity increaseing. Experimental results are in agreement with the simulation results.