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理论和实验研究了一种基于双多层介质膜（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 9.6k W 的高光束质量共孔径合成输出，光束质量2M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每路光纤激光的功率或增加合成路数，采用该方案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 MLD grating dispersion compensation theory is theoretically and experimentally studied. This laser not only realizes the high-beam-quality co-aperture spectroscopic synthesis output of multi-channel fiber laser, but also reduces the single- Laser line width 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 co-aperture combined output with a power of 9.6kW, with a beam quality of 2M and a combined efficiency of 92.0%. By further compressing the linewidth of each fiber laser and increasing the power of each fiber laser or increasing the number of synthesis paths, a co-aperture laser output can be obtained with higher power and higher beam quality levels.