光纤激光器谱合成系统合成效率的计算分析

在简化模型的基础上，从三能级粒子速率方程出发，结合光纤激光器的光束传输方程，推导出光纤激光器谱合成系统的输出功率和合成效率的解析表达式.在此基础上，对合成效率进行了计算分析，并讨论了影响合成效率的主要因素.结果表明，光纤激光器谱合成系统的合成效率主要由光纤激光器输出镜反射率、谱合成系统的外腔输出镜反射率、光栅衍射效率以及望远镜滤波组件透过率决定.

Analysis of Combining Efficiency of Spectral Combining Technique for Fiber Lasers

The principle of the spectral combining technique of fiber lasers was analyzed.From the three-level rate equation,the analytical expressions of the output power and the combining efficiency of the spectral combining system were derived based on the simplified model and propagation equation of the light in fiber lasers.The combining efficiency was calculated numerically and the main factors affecting on the combining efficiency were discussed.It can be shown that the combining efficiency of the spectral combining system are determined by the reflectivity of output mirror of fiber laser,the reflectivity of output mirror of the spectral combining system,the diffracting efficiency of the grating,as well as the transmission of the telescope system.