固态热容激光器3维瞬态热畸变模拟分析
Simulation analysis of 3D dynamic thermo-optic effect of solid state heat capacity laser
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摘要: 根据固态热容激光器的动态工作特性，考虑热力学参数与温度的关系，采用3维有限差分方法模拟分析了薄片热容激光器的3维温度和热应力分布随时间的变化关系。计算了热容激光器的热畸变和退偏损耗随时间的动态变化规律，并与采用连续水冷却方式工作的圆棒激光器的热畸变特性做了比较。模拟结果显示，形变是引起波前相位畸变的主要因素，退偏损耗随泵浦时间增加和泵浦功率增大而非线性增大。Abstract: According to dynamic working characteristics of solid state heat capacity laser, the three dimensional(3D) temperature and thermal stress distribution of cylinder disk heat capacity laser varying with working time is simulated and analyzed using finite difference method. Dynamic variation of thermal distortions and depolarization losses of heat capacity laser is also analyzed. The simulation results are compared with those of continued water-cooled rod laser. Deformation is found to be the main factor of phase distortion for cylinder disk heat capacity laser. Moreover, the depolarization loss increases nonlinearly with the pumping time and pump power.
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