Open AccessSimulation of internal stress waves generated by laser-induced damage in multilayer dielectric gratings
Author(s) -
Sheryl M. Gracewski,
S. Boylan,
John C. Lambropoulos,
J. B. Oliver,
T. J. Kessler,
Stavros G. Demos
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.018412
Subject(s) - materials science , laser , optics , dielectric , stress (linguistics) , grating , fabrication , finite element method , optoelectronics , structural engineering , medicine , linguistics , philosophy , physics , alternative medicine , pathology , engineering
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. These models specifically investigate the influence of geometric and material parameters on how stress waves can lead to degradation of material structural integrity that can have adverse effects on its optical performance under subsequent laser irradiation: 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%.