【摘要】 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。更多还原

【Abstract】 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 socalled 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.更多还原