Interference fringes of coherent combining fiber lasers

In order to study the characteristics of the interference patterns of two coherently combined fiber lasers, experimental and numerical computing method was used.Based on the theory and experiments the interferent fringes of coherent combining of fiber lasers were obtained.It is shown that the interference strips are mainly affected by the beam separation, focal length of Fourier transform lens and beam waist, etc.With increasing beam separation, the number of interference fringes increases and the fringe separation and visibility decrease.When the focal length of Fourier transform lens increases the fringe separation and number of fringes do not change obviously, but the visibility increases.This work will be useful for relative experiments.