对高功率光纤激光的被动相干组束技术进行了理论和实验研究。介绍了几种典型的被动相干组束技术，并对其功率可提升性进行了分析。详细报道了课题组在光反馈环形腔结构光纤激光相干组束方面的研究进展，研究分析了该相干组束技术的输出光谱特性和路数可提升性，建立了4路和8路高功率光纤放大器的相干组束系统，并分别实现了1062和1090 W的相干耦合激光输出。

Passive coherent beam combination of high power fiber laser arrays is researched theoretically and experimentally. Some typical technologies of passive coherent beam combination of fiber laser arrays are introduced, and their power scaling is analyzed. The principle of passive coherent beam combination based on ring cavity is analyzed. The coherent output spectrum characteristics and array size scalability of the passively coherently phased fiber laser arrays are explored. High power passive phase locking of 4-channel and 8-channel fiber amplifier arrays with ring cavity are experimentally demonstrated, and the maximum coherent output powers are up to 1062 and 1090 W, respectively.