Effects of Fiber Array Disturbance on Beam Quality in Compact Spectral Beam Combining System

Citation

WANG, Yongneng, LI, Fujian, RAO, Daxing, CUI, Yong, ZHAO, Xiaohui, HE, Ruijing, JI, Lailin, GAO, Yanqi, SUI, Zhan, & CHEN, Huacai. (2022). Effects of Fiber Array Disturbance on Beam Quality in Compact Spectral Beam Combining System [紧凑型光谱组束系统中光纤阵列扰动对光束质量的影响分析]. Chinese Journal of Lasers (中国激光), 49(1), 0102008. https://doi.org/10.3788/CJL220826

Keywords

• 光纤阵列 / fiber array
• 光束质量 / beam quality
• 光谱组束 / spectral beam combining
• 紧凑型组束系统 / compact beam combining system
• 光纤阵列扰动 / fiber array disturbance
• 位移扰动 / displacement disturbance
• 指向扰动 / pointing disturbance
• 光束质量因子 M² / beam quality factor M²
• 衍射积分 / diffraction integral
• Heisenberg 不确定性原理 / Heisenberg uncertainty principle

Brief

This article analyzes the impact of fiber array displacement and pointing errors on the beam quality factor (M²) of a combined laser in a compact spectral beam combining system, determining the required precision for these parameters.

Summary

This article theoretically analyzes how displacement and pointing errors in the fiber array of a compact spectral beam combining system degrade the quality (M² factor) of the resulting laser beam. It finds that horizontal (x-axis) displacement is the most critical error to control within microns. The study provides quantitative relationships between these errors and beam quality, defining the required precision for fiber array alignment. Furthermore, it shows that increasing the number of combined beams (beyond 23) leads to a stable average beam quality under random disturbances. Ultimately, the research confirms the potential of compact spectral beam combining for creating high-power, high-quality fiber lasers by understanding and controlling fiber array disturbances.

Origin: https://doi.org/10.3788/CJL220826