Study on cladding light strippers in high power fiber lasers
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摘要: 为了提高大功率双包层光纤激光器的光束质量、光谱特性以及光纤系统的稳定性，设计了一种用于滤除光纤内包层残留光的新型高功率包层光滤除器。采用蒙特卡洛算法以及光线轨迹追踪法对包层光滤除器进行了数值计算，评估包层光滤除器的滤除能力，并借助计算流体力学软件ANSYS，分析包层光滤除器的温度场分布。结果表明，优化级联结构后的包层光滤除器的滤除效果达到16.7dB，降低了包层光滤除器的热点温度，在600W的输入功率下，热点温度降低了20.8℃，实现了包层光功率的均匀滤除；在滤除功率达到千瓦量级时，该包层光滤除器仍能够稳定工作在70℃以内，满足大功率光纤激光器系统稳定运行的要求。Abstract: In order to improve the beam quality and spectral characteristics of a high power double clad fiber laser and improve the stability of the optical fiber system, a novel high power cladding light stripper was designed to strip the residualoptical power in the fiber cladding. High power cladding light stripper was analyzed through theoretical calculation and simulation analysis. Based on the Monte Carlo algorithm and light trajectory tracking method, the performance of the cladding light stripper was calculated. With the aid of computational fluid dynamics software ANSYS, the temperature field distribution of the cladding light stripper was analyzed. After optimizing the cascade model structure, strip efficiency of the stripper can reach up to 16.7dB, the hot-spot temperature of the cladding light stripper was reduced, and uniform strip was realized, hot-spot temperature was decreased 20.8℃ under the input power of 600W. The results show that the cladding light stripper can work stably at 70℃ when the power reaches the kilowatt level, it can meet the requirements of high power fiber laser systems.
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Keywords:
- fiber optics /
- fiber laser /
- double clad fiber /
- cladding light stripper
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Figure 8. Temperature field distribution
a—before optimization under input power of 100W b—after optimization under input power of 100W c—before optimization under input power of 600W d—after optimization under input power of 600W
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