Cr,Tm,Ho∶YAG激光器有效反转减少因子的数值模拟分析  

Analysis of the effective inversion reduction factor of 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,四川成都610041 [2]四川大学电子信息学院,四川成都610064

出　　处：《激光与红外》2010年第12期1310-1315,共6页Laser & Infrared

摘　　要：为了分析Cr,Tm,Ho∶YAG(以下简称为CTH∶YAG)系统中Ho3+在受激跃迁时的工作特性,从速率方程中的反转减少因子出发,引入了有效反转减少因子的概念,从对有效反转粒子数利用率的角度,对其有效反转减少因子γC*TH∶YAG进行了数值模拟和分析。结果表明,γC*TH∶YAG是温度T的非线性递增函数,且在一定的工作温度范围内有一个拐点,存在一段近似线性的区域。在几十K到几百K的温度范围内均有1<γC*TH∶YAG<1.5,且在室温下γC*TH∶YAG更接近于1。另外,γC*TH∶YAG的取值还受Stark跃迁能级变化的影响,但其随温度变化的主要性质不会改变。明确了γC*TH∶YAG的意义和性质,为CTH∶YAG系统的温度敏感特性提供了理论依据,对优化输出结果有指导性意义。In order to analyze the characteristic of Ho3＋ in CTH∶YAG during the stimulated emission,the effective inversion reduction factor which reflects the utilization rate of the effective population inversion has been introduced into laser rate equation to substitute the inversion reduction factor.The numerical simulation of the effective inversion reduction factor of CTH∶YAG（γ＊CTH∶YAG） shows that γ＊CTH∶YAG is a nonlinear increasing function of the temperature（T）,and has an inflexion near the cooling water temperature,which brings an approximate linear increasing area.There is 1γ＊CTH∶YAG1.5 in the temperature range in which the laser can work,and γ＊CTH∶YAG is closer to 1 around room temperature.In addition,γ＊CTH∶YAG is also affected by the change of transition stark level,but the effect doesn′t change its main characteristic relating to temperature.The analysis show the meaning and characteristic of γ＊CTH∶YAG,which provide a theoretical evidence of temperature sensitivity of CTH∶YAG system,and is useful for optimizing the output pulse.

关 键 词：激光器 CTH∶YAG有效反转减少因子 温度 Stark能级 玻尔兹曼分布 

分 类 号：TN241[电子电信—物理电子学]