Three dimensional numerical simulation of modulation by transverse crack on fused silica subsurface

The three-dimensional transverse defect model on exit surface of fused silica was established. Three-dimensional finite-difference time-domain method was used to simulate the electric field intensity distribution in the vicinity of transverse cracks on fused silica subsurface. The modulation of incident light field caused by the width, depth, length and gradient angle of the cracks was analyzed. The results show that the maximal electric field intensity in fused silica will be enhanced as the depth and length increase. The maximal electric field intensity tends to be a constant when the length exceeds 1 μm. The fused silica is more fragile while the crack configuration factor is 1～2. The effect of light intensity enhancement on the rear surface is more obvious when total internal reflect