Mechanism analysis of regular concentric rings on laser disturbing CCD detector

The concentric rings were reported for the first time when 532 nm YAG pulsed laser interfered CCD imaging system at the distance of 31.5 m under infield. According to analysis of experimental process, relative intensity distribution of concentric rings and imaging properties of CCD system, the generation conditions of concentric rings were found to be stable and inherent to the optical system.Meanwhile, the imaging properties of the concentric rings and laser spot were different. Aiming at various diffractions and interferences of the CCD optical system, the theory analysis and contrast of experimental results were done by combining with central spot size, positional distribution, relative intensity distribution, imaging properties and occurring probability of concentric rings in this paper. The results indicate that the concentric rings are formed from equal thickness interference of reflected laser between the top and bottom surface of the optical system cemented lens.