Detection and Tracking of Laser Damage Sites on Fused Silica Components by Digital Image Correlation

Guillaume Hallo (1, 2) , Chloé Lacombe (2) , Jérôme Néauport (2) , François Hild (1)

1 LMT - Laboratoire de mécanique et technologie
2 CESTA - Centre d'études scientifiques et techniques d'Aquitaine

Final optics of high energy laser facilities are susceptible to laser-induced damage that reduces the quality of laser beams. In such facilities, images of protection windows are acquired on a daily basis. However, some motions may occur in addition to illumination changes. A method based on registration principles is developed to detect and quantify laser damage sites, which leads to sub-pixel resolution and corrects for brightness and contrast variations. The procedure is applied to a set of actual images of a silica window. The proposed approach is efficient to ensure reliable monitoring of damage inception and growth.

Domaines: Mécanique des matériaux [physics.class-ph]

Guillaume Hallo, Chloé Lacombe, Jérôme Néauport, François Hild. Detection and Tracking of Laser Damage Sites on Fused Silica Components by Digital Image Correlation. Optics and Lasers in Engineering, 2021, 146, pp.106674. ⟨10.1016/j.optlaseng.2021.106674⟩. ⟨hal-03235738⟩