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理论和实验研究了一种基于双多层电介质膜(MLD)光栅色散补偿构型设计的光谱合成激光器,该激光器既实现了多路光纤激光高光束质量共孔径光谱合成输出,也降低了单路光纤激光的线宽要求。优化了该激光器的光束质量退化分析模型,分析了激光波长、光栅色散和光谱结构对光谱合成输出光束质量的影响,实验研究了不同功率水平下的光谱合成输出光束质量变化特性,获得了最大输出功率为9.6kW的高光束质量共孔径合成输出,光束质量M2为2.9,合成效率达到92.0%。通过进一步压缩每路光纤激光的线宽并提升其功率或增加合成路数,可以获得更高功率和更高光束质量水平的共孔径激光输出。
A spectroscopic synthesis laser based on the design of two-layer MLD grating with dispersion compensation has been theoretically and experimentally studied. The laser not only achieves the multi-path fiber laser with high beam quality and co-aperture spectral synthesis output, but also reduces the single Fiber laser linewidth requirements. The laser beam quality degradation analysis model was optimized. The effects of laser wavelength, grating dispersion and spectral structure on the quality of the output beam were analyzed. The quality characteristics of the output beam with different spectral powers were experimentally studied, and the maximum output High beam quality with a power of 9.6kW Co-aperture synthesis output, beam quality M2 of 2.9, the synthesis efficiency of 92.0%. By further reducing the linewidth of each fiber laser and increasing its power or increasing the number of synthesis paths, a co-aperture laser output can be obtained for higher power and higher beam quality levels.