Simulation of Internal Stress Waves Generated by Laser-Induced Damage in Multilayer Dielectric Gratings

Published on 2018-07-03T19:50:02Z (GMT) by
Multilayer dielectric (MLD) gratings used in ultrahigh-intensity laser systems often exhibit a laser-induced damage performance below that of their constituent materials. Reduced performance may arise from fabrication- and/or design-related issues. Finite element models were developed to simulate stress waves in MLD grating structures generated by laser-induced damage events. The models investigate the effects of geometric and material parameters on how stress waves contribute to amplifying material inhomogeneities, thereby reducing the overall damage performance: closer impedance matching of the layer materials reduces maximum interface stresses by ~20% to 30%; increasing sole thickness from 50 nm to 500 nm reduces maximum interface stresses by ~50%.

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Gracewski, Sheryl; Boylan, Sean; Lambropoulos, John; Oliver, James; Kessler, Terrance; Demos, Stavros (2018): Simulation of Internal Stress Waves Generated by Laser-Induced Damage in Multilayer Dielectric Gratings. The Optical Society. Collection.