Based on the finite element analysis method, establishment of a three dimensional fused silica lens model under the laser irradiation, and simulated the ideal fused silica surface temperature field and thermal stress field distribution situation, then the influences of subsurface deficiency on fused silica‘s laser damage threshold (LDT) were analyzed, which include scratch and impurity. It is found that the deficiencies in subsurface may affect the distribution of temperature field and thermal stress field of the fused silica surface, which makes the injected laser beams energy centralize on a small area around the deficiencies, thus leading to stress cracking of fused silica and LDT reduction.

Date Published: 9 July 2013
PDF: 7 pages
Proc. SPIE 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers, 87861Z (9 July 2013); doi: 10.1117/12.2020245

Published in SPIE Proceedings Vol. 8786:
Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)