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从固体瞬态热传导微分方程出发并结合弹性力学的基本方程,利用有限元方法对 Nd:GGG 热容激光器介质的瞬态温度和热应力进行了数值模拟。数值模拟并分析了介质端面抽运光为均匀分布和高斯分布两种情况下,介质的温度、应力的瞬态分布。模拟中考虑了由介质的吸收特性导致的介质热沉积功率不均匀分布和介质热容随温度的变化关系。结果表明,抽运光功率一定时,抽运光均匀分布时介质的最高温度较低,温度梯度较小,介质所受热应力较小。
Based on the solid transient heat conduction differential equation and the basic equations of elasticity, the transient temperature and thermal stress of the Nd: GGG heat capacity laser medium are numerically simulated by finite element method. The transient distributions of temperature and stress of medium are numerically simulated and analyzed under both uniform and Gaussian distributions. The simulation considers the non-uniform distribution of dielectric heat deposition power and the change of heat capacity of medium with temperature due to the absorption characteristics of the medium. The results show that when the pumping light power is constant, the maximum temperature of the medium is lower, the temperature gradient is smaller and the thermal stress on the medium is lower when the pump light is evenly distributed.