2026-10-14T18:07:13Z https://www.scidb.cn/oai

10.57760/sciencedb.38426 2026-06-11T10:43:55Z

2026-06-11 Mechanism of hydration induced gamma ray degradation in ion beam figured fused silica doi:10.57760/sciencedb.38426 en Ion beam figuring (IBF) improves laser damage resistance in fused silica, yet its radiation reliability after surface hydration remains unclear. We show that surface hydration significantly reduces the damage threshold of irradiated IBF samples, whereas non-hydrated counterparts remain stable. Degradation follows a coupled pathway where IBF induced deoxygenation creates reactive Si-rich surfaces that hydrate into Si-OH groups. Gamma irradiation subsequently ruptures O-H bonds to generate non-bridging oxygen hole centers (NBOHCs), enhancing ultraviolet (UV) absorption. ReaxFF simulations validate this microscopic transition from Si-rich defects to hydrated structures. Our results reveal a mechanism involving deoxygenation, hydration, and defect formation, highlighting the critical role of surface hydration in the radiation stability of high-precision optics. ion beam figuring; fused silica; gamma ray degradation 李畅 PUBLIC https://creativecommons.org/publicdomain/zero/1.0/ dataset Science Data Bank