Numerical simulation of light intensity distribution in vicinity of defect on fused silica subsurface

The main factor of laser induced field damage is the modulation of light field by the defects on the fused silica subsurface. The finite element method is used to simulate the light intensity distribution in the vicinity of defects(planar and conical cracks)on the fused silica subsurface.The results show that light intensity distribution around a crack is determined by several factors, including crack morphology, geometry dimension, azimuth and incidence angle. The enhancement effect of a crack on the output surface is stronger than that on the input surface. When total internal reflection occurs at both the ideal morphology planar crack and the surface, high light intensification can occur in area adjacent to the planar crack. The light distribution in the vicinity of a conical crack prov