Modeling of laser-induced surface cracks in silica at 355 nm

Abstract

SummaryStarting from the absorption of laser energy at a subsurface nanoparticle in fused silica, we simulate the consequent buildup of stresses and resulting mechanical material damage . The simulation indicates the formation of micropits with size comparable to a wavelength, similar to experimental observation. Possible mechanisms for enhanced local light absorbtion are discussed.

Laser-induced damage mechanisms and improvement of optical qualities of bulk potassium dihydrogen phosphate crystals

“…So, if we accept multi-photon ionization as the mechanism of free carrier generation, only small n values make sense. Multi-photon ionization is one important mechanism of free carrier generation when a KDP crystal is irradiated by the laser [2][3][4][5][6][7][8]. The number of photons needed to create a free electron is sensitive to the photon energy.…”

Thermique photo-induite, déflexion photothermique et endommagement laser dans les composants optiques interférentiels. Mesures d'absorption optique et tenue au flux

“…Il ne reste plus qu'à calculer les déflexions données en (27) ou (28). Pour cela, et compte tenu du gradient d'indice en (23), il faut préciser l'expression de la température.…”

Influence of deposition temperature on the properties of high-reflectivity coatings

“…1 Moreover, laser-induced damage of 355-nm high-reflectivity ͑HR͒ coatings is a more severe problem than that of 1064-nm HR coatings. 2 One of the continuing challenges facing the high-energy laser field is to develop 355-nm HR coatings that can withstand higher energy densities. The understanding of the origin and mechanism of laser-induced damage in 355-nm HR coatings is very important for improving the LIDT.…”