Laser damage performance of large-aperture fused silica opticalcomponents at 351 nm

摘要

High power laser facility for ICF will routinely operate at high fluence level. The damage on the large-area FOA opticsis a key lifetime limiter. The optics should be checked after each laser shot for damage initiation and growth. On-linemonitoring equipments are installed for this purpose. Damage pictures of a fused silica component are successfully takenand the luminance of the pictures could reflect the deterioration of the operational environment .Damage initiation andgrowth behaviors at 351nm high-fluence laser were observed. Damage density and damage growth are exponential withthe shot number and some conclusions could be drawn. These results bring forward demands for future monitoringequipments and more experiments to establish a lifetime model.