固体热容激光器冷却方式的数值模拟

Numerical simulation of cooling methods for solid heat capacity laser

固体热容激光器连续运转一段时间后,需要进行冷却,以进行下一次运转,因此冷却速度直接影响着热容激光器运转的效率和实用性。从热传导方程出发,以沉积热为内热源模型,利用有限元分析方法对激光二极管阵列从4个方向对称泵浦的板条Nd:GGG激光介质的温度场和和热应力场进行了数值模拟。并对冷却阶段分别采用过冷气体、水循环、喷雾、相变冷却方式时的介质温度和应力随时间变化过程进行了模拟。结果表明在相同条件下采用相变冷却方式能在较短时间内将介质冷却到初始温度。

The solid heat capacity laser needs cooling after continuous operation for a short time before the next operation, so the cooling speed directly affects its working efficiency. The Nd.. GGG disk laser medium end symmetrically pumped from four directions by the diode arrays was adopted. Based on the heat transfer equation with heat depositing mode, the numerical simula- tions of the temperature field and the thermal stress distribution in the slab medium were performed under the condition of heat capacity operation by finite element analysis method. Four cooling methods, including cold gas, water cycle, atomization and phase cooling, were respectively used to cool the slab medium. The transient tcmpcrature history and the stress history of the medium were simulated. The simulation result indicates that the phasc cooling method can cool the medium to the initial tcmpcrature in the shortest time.