Growth of Laser Initiated Damage in Fused Silica at 351nm.

Norton, M. A. ; Hrubesh, L. W. ; Wu, Z. ; Donohue, E. E. ; Feit, M. R.

Technical Information Center Oak Ridge Tennessee

关键词: Lasers;    Silica;    Damage;    Optics;    Lifetime;   

RP-ID  :  DE200515013162

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The lifetime of optics in high-fluence UV laser applications is typically limited by the initiation of damage and its subsequent growth. We have measured the growth rate of laser-induced damage on fused silica surfaces in both air and vacuum. The data shows exponential growth in the lateral size of the damage site with shot number above a threshold fluence. The concurrent growth in depth follows a linear dependence with shot number. The size of the initial damage influences the threshold for growth; the morphology of the initial site depends strongly on the initiating fluence. We have found only a weak dependence on pulse length for growth rate. Most of the work has been on bare substrates but the presence of a sol-gel AR coating has no significant effect.