工作温度对光纤激光器输出特性的影响研究

Research on Fiber Laser Performance Working at Different Temperatures

通过理论分析和实验研究系统分析了工作温度对光纤激光器输出功率、光谱特性的影响。建立考虑抽运波长变化的激光器速率方程模型，仿真分析了关键器件工作环境温度对光纤激光器输出功率的影响。在915nm激光抽运下，利用搭建实验系统测试了激光二极管（LD）、光栅、光纤等温度变化对输出激光功率、光谱的影响，并与理论计算结果进行对比。结果表明，理论仿真与实验结果基本一致，光纤激光器在设定15℃～40℃冷却范围内，较稳定输出约140W功率，除了包层光滤除以外的关键点温度低于55℃，具备一定的高低温工作的能力。

The relationship between the output performance and the working temperature of the fiber laser is studied both in theory and experiment. A numerical model based on laser rate equations concerning the change of pump wavelength is built up and used to calculate and analyze the temperature shift influence of some key components on the change of laser performance. By building the experiment configuration with 915nm wavelength pump light input, the output power and spectrum of the fiber laser are measured while changing the temperature of certain devices like laser diode （LD）, grating and doped fiber. Compared with the calculation result, the experimental results suit the model simulation. The fiber laser holds working stability with about 140 W output in the set cooling range of temperature from 15 to 40℃. The temperatures of all the key components except the pump stripper are controlled below 55℃. The fiber laser has certain good performance under different temperature conditions.