Mesh distribution of laser energy on the photosensitive surface of CCD

The mesh distribution of laser energy and crosstalk points on the photosensitive surface of visible array CCD was observed when it was irradiated by 1 064 nm pulsed laser from a distance of 30 m. It was found that the pitch of adjacent lattice was about 100 m and remained unchanged as the incident laser energy increased or F-number of the front optical system decreased, but the center main spot and the spots at the ambient lattices could enlarge little by little with the decrease of F-number. It was clearly seen that every spot at the ambient lattices was geometric image of optical system's stop when F-number is 2.8. There is no doubt that the novel phenomena are firstly reported and the related research will certainly promote deep investigation on the laser propagation in the optical system and the interaction between laser and material.