Self-organized coherent combination of multichannel fiber lasers based on power coupler

Self-organized passive coherent beam combination(CBC) of multichannel fiber laserswith 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.