The regular circular fringes can be observed at the photosensitive surface when the visible array CCD was used to measure the far-field distribution of laser energy. In order to exactly measure the energy distribution and fringe spacing of circular fringes and analyze their formation mechanism, the selection of main parameters for array CCD were investigated based on the theory of light interference and diffraction. The research results show that the resolution of array CCD depends on the fringe spacing of diffraction, the dynamic range of array CCD depends on the order of diffraction fringe, and the minimum radiation rests with the power of incident laser and distance.
