Image processing method for laser damage probability measurement by single-shot of laser pulse

Abstract

An experiment for high efficiency laser-induced damage probability measurement has been implemented using a periodic binary phase grating. With such a grating, a laser beam is transformed into an ensemble array of Gaussian-like spots, which is known as the Fresnel image of the grating. A scientific CCD camera is used to image the laser spot array as well as the damage of the coating sample. The image data is then processed to obtain the peak fluence distribution of the laser spot array based on the calibrated CCD grayscale. By comparing the image of the damaged coating sample with that of the laser spot array, the damage probability of the coating sample can be precisely determined by the use of single-shot of laser pulse.