Abstract
Modulation of incident laser by surface defects is one of the major reasons of laser-induced damage of fused silica. In this work, the three-dimensional finite-difference time-domain calculations are employed to investigate the electrical field modulation of incident laser at 351nm by Gaussian defect site with a contamination coating in fused silica exit surface. The effect of the dielectric constant and the thickness of the contamination coating on the electrical field distribution are discussed. The simulated results reveal that the contamination coating on defect site plays an important role in the electrical field modulation of the incident laser. The modulation becomes stronger than that without the contamination. Besides, the relationship between the electrical field modulation and the temperature of defect site surface is also studied. It is found that modulation increases with surface temperature. Meanwhile, the underlying physical mechanism is analyzed in detail.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
