Cr,Tm,Ho:YAG激光器温度特性的数值分析  

Analysis of the temperature characteristics of a Cr,Tm,Ho:YAG laser

作　　者：郭嘉伟[1] 李彤[1] 牛瑞华[1,2] 薛亮平[1] 李燕凌[1] 王宏元[1] 

机构地区：[1]西南技术物理研究所,成都610041 [2]四川大学电子信息学院,成都610064

出　　处：《激光技术》2011年第6期761-764,共4页Laser Technology

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。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.

关 键 词：激光器 温度 数值模拟 CTH:YAG 速率方程 准三能级 Tm.Ho准热平衡体系 

分 类 号：TN248.1[电子电信—物理电子学]