Study on coherent beam combination of fiber laser array

Coherent beam was an important method to obtain high power and high beam quality laser. In order to analyze the characteristics of fiber laser beam combination, influence of fiber laser array structure, phase random jitter, fiber spacing, transmission distance and other factors on coherent combination was discussed by comparing the intensity distribution at different propagation distance. Power in the bucket for coherent beam was evaluated. The result shows that intensity distribution of different fiber laser array is different when the propagation distance is near. Intensity distribution is close to Gaussian distribution with the increasing of propagation distance. The number of the maximum intensity distribution points in the axis has the close relationship with the circular number of fiber laser array. The coherent effect is better if the random phase difference of the laser array is smaller. These results are reference to the study of fiber laser coherent combination.