Damage performance and developments of final optics system for UV nanosecond high power laser systems

摘要

UV laser damage is still the key issue of high power nanosecond laser systems. The operation performance of the finaloptics in SGII-UP facility is first reviewed. Based on a high power laser prototype, laser-induced damage of largeaperture final optics at 351nm was experimentally studied, including damage initiation, growth and morphologies. Thenear filed of 351nm laser beam was precisely measured with a high resolution by using the precision diagnostics system(PDS) to study the effects of laser modulation and propagation on laser damage. The damage behaviors werecomprehensively analyzed and the main contributors to laser damage were discussed. The development perspective offinal optics system for high power laser system is briefly introduced.