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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(SBC)既实现了多路光纤激光高光束质量共孔径合束输出,又降低了单路光纤激光的线宽要求,逐渐成为多纤光谱合成的重要技术途径之一.介绍了基于双MLD光栅光谱合成的基本原理,简要分析了其涉及的关键技术.回顾了高功率可合成窄线宽光纤激光器、高功率高效率短波长光纤激光器、大色散高衍射效率MLD光栅和高集成度密集组束等主要关键技术的研究进展.介绍了中国工程物理研究院应用电子学研究所在基于双MLD光栅光谱合成关键技术研究方面的最新研究进展.对双MLD光栅光谱合成光源的发展潜力进行了展望.“,”A spectral beam combination (SBC) system with dual Multi-Layer Dielectric (MLD) grating dispersion compensation configuration, which can combine multiple fiber lasers into a common aperture beam with high beam quality and relax the linewidth requirement of the individual fiber laser, has become gradually one of the most important technique route of fiber laser beam combining. The basic principle and the key technologies of the SBC system with dual -MLD -grating configuration were introduced and analyzed briefly. The recent progress of the main key technologies about high power beam combinable narrow linewidth fiber laser, high power high efficiency short wavelength narrow linewidth fiber laser, large dispersion high efficiency MLD grating and high integration dense beam combining were reviewed. The recent progress on the key technologies of SBC with dual-MLD-configuration in Institute of Applied Electronics, China Academy of Engineering Physics, were also presented. The potential of the SBC with dual-MLD-configuration was prospected.