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2 December 2022 Estimation of damage sizes from scattered light intensity without calibration on LMJ
Guillaume Hallo, Chloé Lacombe, Marin Fouchier, Myriam Zerrad, Jérôme Néauport, François Hild
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Proceedings Volume PC12300, Laser-Induced Damage in Optical Materials 2022; PC1230007 (2022) https://doi.org/10.1117/12.2641439
Event: SPIE Laser Damage, 2022, Rochester, New York, United States
Abstract
High energy laser facilities designed for fusion experiments, such as Laser MegaJoule or National Ignition Facility, are limited by laser-induced damage on their final optics. Accurate and early detection of damage growth is required for successful operation of such facilities. Since the image resolution is about the size of damage sites to monitor, diameter measurements are not sufficient to meet the objectives of damage growth quantification. An accurate size quantification of damage sites is based on light scattering measurements after time-consuming calibrations on the facility. An optical model is proposed to perform a simple and fast calibration of the measurements by numerical simulation. The model is based on light scattering measurements of several damage sites combined with optical simulations of the lighting system.
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Guillaume Hallo, Chloé Lacombe, Marin Fouchier, Myriam Zerrad, Jérôme Néauport, and François Hild "Estimation of damage sizes from scattered light intensity without calibration on LMJ", Proc. SPIE PC12300, Laser-Induced Damage in Optical Materials 2022, PC1230007 (2 December 2022); https://doi.org/10.1117/12.2641439
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KEYWORDS
Light scattering
Calibration
Image resolution
Imaging systems
Light sources and illumination
National Ignition Facility
Optical testing
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