Rear-surface light intensification caused by a Hertzian-conical crack in 355-nm silica optics

Abstract

Zhang Chun-Lai(章春来) a) , Yuan Xiao-Dong(袁晓东) b) , Xiang Xia(向 霞) a) † , Wang Zhi-Guo(王治国) a) , Liu Chun-Ming(刘春明) a)b) , Li Li(李 莉) a) , He Shao-Bo(贺少勃) a)b) , and Zu Xiao-Tao(祖小涛) a)

Correlation of polishing-induced shallow subsurface damages with laser-induced gray haze damages in fused silica optics

“…[23] In addition, the polishing dots (or scratches) could modulate the light intensity and enhance the field several times in some specific spots. [24][25][26][27] They all make these polishing dots (or scratches) damaged much more easily than a plane surface. That possibly causes the shallow polishing dots (or scratches) to show tight correlation with the gray haze damages.…”

Subsurface defect characterization and laser-induced damage performance of fused silica optics polished with colloidal silica and ceria

“…[4] Therefore, ceria polishing would possibly induce an absorptive contaminant (such as Ce and Fe) and subsurface fractures, [5] which is responsible for triggering the surface damage of fused silica optics. [6][7][8][9] Some researchers also have investigated the influences of different polishing slurries such as ceria, zirconia and alumina on the damage performance. [7,[10][11][12][13][14][15] They showed that the polishing slurries used in chemical mechanical polishing have great influences on the subsurface defect distribution and damage performance of the polished optics.…”

ATR-FTIR spectroscopic studies on density changes of fused silica induced by localized CO 2 laser treatment

“…One of the major concerns encountered for these high-cost fused silica optics is laserinduced surface damage under the exposure of high-fluence UV laser. [1][2][3][4][5][6] For the high-power UV laser facilities, such as the National Ignition Facility (NIF) in USA, [7] the Laser Mega Joule in France, [8] and the SGIII laser facility in China, [9,10] the routine operation is above the damage growth threshold of fused silica optics. Once the surface damages are initiated under the high-fluence UV laser irradiation, they will grow exponentially with subsequent laser shots, and will result in excessive light scattering and beam modulation, and they will finally lead to a shortening of the lifetime of fused silica optics.…”