提出了基于功率合束器的多路光纤激光自组织被动相干合成结构, 研究了多模状态下泵浦功率、合成路数对激光合成效率和光束质量的影响, 并对2, 3, 4路激光合成进行了实验研究, 合成效率大于90%。实验结果表明：激光中心主瓣所占能量比随着泵浦功率的增加而增大, 随激光合成路数增多而增大; 在相同的输出功率下, 单路激光的主瓣所占能量比比合成激光主瓣所占能量比要高; 降低输出光栅反射率, 激光输出能量增强, 但合成效率有所降低; 增加功率和增加路数可以增加中心亮斑的能量比, 但增加幅度变低。

Self-organized passive coherent beam combination(CBC) of multichannel fiber lasers with all-fiber configuration is reported. The influence of pump power and the number of CBC channels on beam quality and combination efficiency is experimentally studied by combining 2, 3 and 4 channels of lasers. The efficiency of coherent combination is above 90%. The result demonstrates that the energy rate of central lobe is improved with the increasing of pump power and the number of lasers. At the same output power, the energy rate of central lobe declines when the number of CBC channels increases. The power scaling from a single channel is better than that from CBC of several channels for the beam quality at the same output power.