How to provide reliable metrology of  online laser-induced damage on large fused silica optics using digital image correlation

Guillaume Hallo; Chloé Lacombe; Romain Parreault; Nadja Roquin; Thierry Donval; Laurent Lamaignère; Jérôme Néauport; François Hild

doi:10.1117/12.2597310

12 September 2021 How to provide reliable metrology of online laser-induced damage on large fused silica optics using digital image correlation

Guillaume Hallo, Chloé Lacombe, Romain Parreault, Nadja Roquin, Thierry Donval, Laurent Lamaignère, Jérôme Néauport, François Hild

Author Affiliations +

Proceedings Volume 11873, Optical Fabrication, Testing, and Metrology VII; 118730A (2021) https://doi.org/10.1117/12.2597310
Event: SPIE Optical Systems Design, 2021, Online Only

Abstract

Final fused silica optics of high energy fusion class laser facilities are one of the components that limit the UV laser energy available for experiments. These final optics suffer from laser-induced damage. Some solutions are available to limit laser damage growth and to increase optics lifetime. However, to use them, it is necessary to be able to detect damage initiation as soon as possible, and to follow damage growth efficiently. An imaging system and a lighting source make the observation of laser damage sites possible after each laser shot without removing the optical components. Laser damage detection algorithms exist but they are not sufficiently efficient to provide reliable monitoring of damage growth over time because of small repositioning fluctuations of the optical system. An effective solution based on digital image correlation and brightness/contrast corrections is proposed to detect and follow laser damage sites as soon as they initiate in an automatic way. The effectiveness of the presented method is compared to the widely used method that is based on the analysis of local signal-to-noise ratio.

Conference Presentation

Citation Download Citation

Guillaume Hallo, Chloé Lacombe, Romain Parreault, Nadja Roquin, Thierry Donval, Laurent Lamaignère, Jérôme Néauport, and François Hild "How to provide reliable metrology of online laser-induced damage on large fused silica optics using digital image correlation", Proc. SPIE 11873, Optical Fabrication, Testing, and Metrology VII, 118730A (12 September 2021); https://doi.org/10.1117/12.2597310

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