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18 December 2024 Exploring enhancements of the multipulse, laser-induced damage resistance of methacrylate polymer coatings in the ultraviolet regime
Nathaniel D. Urban, Marek Stehlik, Alexei A. Kozlov, Marcela Mireles Ramirez, Jenny Zhao, Brittany N. Hoffman, Kenneth L. Marshall, Stavros G. Demos
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Proceedings Volume PC13190, Laser-Induced Damage in Optical Materials 2024; PC131900E (2024) https://doi.org/10.1117/12.3032777
Event: SPIE Laser Damage, 2024, San Ramon, CA, United States
Abstract
Relatively thick (>1-um) organic-polymer coatings with a large resistance to laser-induced damage at UV wavelengths are desired for new inertial confinement fusion laser optics under development at the Laboratory for Laser Energetics. These optics include surface-figured, KDP polarization rotators and actively cooled laser glass. Organic-polymer materials, however, are generally known to have a low laser-induced–damage threshold (LIDT) in the UV, particularly as it pertains to multipulse applications. In this work, we present the single-pulse and multipulse LIDT results for thick (>1.5-um) polymethacrylate films deposited on fused silica and cured at different temperatures. The results demonstrate that it is possible for thick polymer films to withstand thousands of pulses at fluences higher than their single-pulse LIDT counterpart. In fact, in some test sites, the underlying fused silica substrate suffered exit surface damage before the polymer film could be damaged. These results and a discussion of the underlying mechanisms responsible for this behavior will be presented.
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Nathaniel D. Urban, Marek Stehlik, Alexei A. Kozlov, Marcela Mireles Ramirez, Jenny Zhao, Brittany N. Hoffman, Kenneth L. Marshall, and Stavros G. Demos "Exploring enhancements of the multipulse, laser-induced damage resistance of methacrylate polymer coatings in the ultraviolet regime", Proc. SPIE PC13190, Laser-Induced Damage in Optical Materials 2024, PC131900E (18 December 2024); https://doi.org/10.1117/12.3032777
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KEYWORDS
Polymers
Laser damage threshold
Ultraviolet radiation
Laser induced damage
Optical coatings
Resistance
Film thickness
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