为了分析CTH∶YAG激光器在受激跃迁时的温度特性，从速率方程中腔内光子数密度出发，考虑CTH∶YAG的准三能级特性以及Tm-Ho准热平衡体系的影响，定义了相对振荡效能参量。采用数值模拟的方法，分析了相对振荡效能的温度特性，得到了其温度变化曲线。结果表明，CTH∶YAG的相对振荡效能是温度的非线性减函数，且存在截止温度使腔内振荡无法产生；截止温度与Tm-Ho准热平衡体系的储能成正比，相对振荡效能也随Tm-Ho准热平衡体系的储能的增大而增大。这一结果为CTH∶YAG激光器受激跃迁的温度特性提供了理论依据，对改善其工作特性和优化输出结果具有指导性意义。

In order to analyze the temperature characteristics in the stimulated emission of a CTH∶YAG laser, taking the quasi-three-level characteristics of CTH∶YAG and the influence of Tm-Ho quasi-thermal equilibrium system into account, a so-called relative oscillation efficiency parameter was defined based on the photon density in the rate equation. The numerical simulation results show that relative oscillation efficiency is a nonlinear decreasing function of temperature, and there is a stop temperature at which the stimulated emission can not happen. The stop temperature is in direct proportion to the energy stored by Tm-Ho quasi-thermal equilibrium system, and relative oscillation efficiency also augments with the stored energy rising. The analysis provides a theoretical evidence of the temperature characteristics of CTH∶YAG, and is useful for optimizing the output pulse.