透镜导管耦合系统中光线三维追迹模拟分析

Three-Dimensional Simulation Analysis of Ray Trace for Lens Duct as A Coupling System

半导体激光器抽运耦合系统是固体激光器的重要组成部分。非成像系统空心透镜导管构成的耦合系统非常适用于大功率的半导体抽运阵列。为了给出透镜导管耦合系统的最佳结构,需要研究抽运光束在耦合系统内及输出面的分布。利用几何光学理论,在三维空间内,建立了空心透镜导管中抽运光束传播的数学模型,推导了光束传播的三维轨迹方程;在全三维光线追迹的理论分析基础上,开发了模拟透镜导管耦合系统传输光线的3D计算机仿真软件;通过该软件可以自动获得全部抽运光线在透镜导管耦合系统中的真实传输路径及在耦合系统输出端面的分布。最后探讨了抽运光束通过空心透镜导管耦合系统后的能量转换效率。计算结果表明,空心透镜导管的能量转换效率可以达到96.08%以上。

Laser diode （LD） pump coupling system is an important part of the solid-state lasers. Non-imaging system consisting of hollow lens duct coupling system is ideal for high-power semiconductor laser array. Based on geometric optics theory, the mathematic model of three-dimensional （3D） light transmission in hollow lens duct was developed, and 3D ray trace equations were clearly presented. With the help of theoretical analysis of three-dimensional ray trace, a 3D simulation software of ray transmission for lens duct as coupling systems was developed. The real transmission trace of all the pump rays can be shown automatically with the developed 3D software and the pump light distribution in output of lens duct also can he given. Finally. The coupling energy efficiency coming through the hollow lens duct was discussed. The results show that the coupling energy efficiency of the hollow lens duct can reach more than 96.08%.