4 October 2024 Impact of fused silica debris shields and enhanced mitigation techniques on large-aperture beam-sampling optics for the National Ignition Facility
Ryan M. Gini, Christopher F. Miller, David A. Cross, Christopher Wren Carr
Author Affiliations +
Abstract

We show that the large-scale routine use of the fused silica debris shield (FSDS) maintains the 100× reduction in damage initiation rate and 70% increase in the install lifetime of a new grating debris shield (GDS) observed during pilot operations. Furthermore, we show that the install lifetimes of recycled GDS optics are nearly tripled using additional mitigation strategies such as expanding mitigation processing to include all damage sites larger than 10 μm (LT10) rather than just larger than 50 μm (LT50) and FSDS. We note that there is still a 50% difference between new and recycled optic installation lifetimes. We show that recycled optics have a 3.5× higher apparent initiation rate than new optics when exposed to nominally identical laser conditions.

© 2024 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ryan M. Gini, Christopher F. Miller, David A. Cross, and Christopher Wren Carr "Impact of fused silica debris shields and enhanced mitigation techniques on large-aperture beam-sampling optics for the National Ignition Facility," Optical Engineering 64(3), 031003 (4 October 2024). https://doi.org/10.1117/1.OE.64.3.031003
Received: 24 May 2024; Accepted: 24 August 2024; Published: 4 October 2024
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KEYWORDS
National Ignition Facility

Silica

Optical engineering

Optical gratings

Inspection

Laser induced damage

Gas lasers

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