Repair strategies for fused silica wedged focus lens with high density filamentary damage

Keturah Palma; Rajesh Raman; Chris Miller; Scott Trummer; David Cross; Wren Carr

doi:10.1117/12.2686090

30 November 2023 Repair strategies for fused silica wedged focus lens with high density filamentary damage

Keturah Palma, Rajesh Raman, Chris Miller, Scott Trummer, David Cross, Wren Carr

Author Affiliations +

Proceedings Volume PC12726, Laser-Induced Damage in Optical Materials 2023; PC127260H (2023) https://doi.org/10.1117/12.2686090
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

The National Ignition Facility (NIF) is intentionally operated with the final fused silica glass (SiO₂) optics exposed to fluences and intensities with the potential to induce damage that will grow with additional laser exposure. Therefore, the NIF operates a recycle loop to refurbish final optics by mitigating any initiated surface damage to arrest its growth. However, the morphology of filamentary damage, caused by local self-focusing in the bulk of a silica optic, adds additional complexity to optics mitigation and provides a limitation to optic reusability. This study evaluates techniques for mitigating isolated and clustered filamentary damage. Optical microscopy before and after NIF installation was used to determine the efficacy of filamentary mitigation after a series of high fluence and intensity laser exposures. The challenges and success rate of the methods are compared for various filamentary damage mitigations strategies.

Conference Presentation

Citation Download Citation

Keturah Palma, Rajesh Raman, Chris Miller, Scott Trummer, David Cross, and Wren Carr "Repair strategies for fused silica wedged focus lens with high density filamentary damage", Proc. SPIE PC12726, Laser-Induced Damage in Optical Materials 2023, PC127260H (30 November 2023); https://doi.org/10.1117/12.2686090

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