Modifying fused silica surfaces to reduce the impact of laser-induced damage precursors

Christopher F. Miller; Koroush Sasan; David Cross; Audrey Eshun; Saaxewer Diop; Christopher Carr

doi:10.1117/12.3032773

18 December 2024 Modifying fused silica surfaces to reduce the impact of laser-induced damage precursors

Christopher F. Miller, Koroush Sasan, David Cross, Audrey Eshun, Saaxewer Diop, Christopher Carr

Author Affiliations +

Proceedings Volume PC13190, Laser-Induced Damage in Optical Materials 2024; PC131900P (2024) https://doi.org/10.1117/12.3032773
Event: SPIE Laser Damage, 2024, San Ramon, CA, United States

Abstract

Laser-induced damage is typically a limiting factor in the design of ultraviolet nanosecond highenergy laser systems. Efforts over the last 10+ years have resulted in significant improvements to laser-induced damage resistance of fused silica by removal of damage precursors historically left by several steps in the fabrication process. However, by enabling optics to operate at higher energy densities, new challenges have emerged. Fused silica, when exposed to high-energy laser light (without inducing damage) can degrade the damage robustness of adjacent surfaces. It is hypothesized that vaporized SiOx particles from the first laser exposure recondense onto surrounding surfaces acting as local absorbers which can initiate damage upon future exposure. We show that modifying the fused silica surface using either chemical or thermal treatment can significantly alter the magnitude of the degradation. Finally, we develop two hypotheses that can explain the reduction in observed surface degradation.

Conference Presentation

Citation Download Citation

Christopher F. Miller, Koroush Sasan, David Cross, Audrey Eshun, Saaxewer Diop, and Christopher Carr "Modifying fused silica surfaces to reduce the impact of laser-induced damage precursors", Proc. SPIE PC13190, Laser-Induced Damage in Optical Materials 2024, PC131900P (18 December 2024); https://doi.org/10.1117/12.3032773

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