Damage-growth performance in multilayer dielectric mirrors under 351-nm, 1-ns laser pulses: influence of design parameters
Year: 2026
Type: article
Abstract: Multilayer dielectric (MLD) mirrors are critical for next-generation, large-aperture, high-repetition-rate laser systems, such as inertial fusion energy drivers or directed energy systems. The performance of MLD mirrors must remain unaffected by laser-induced damage over their operational lifetime. This study investigates the material and design parameters that influence the damage-growth performance of fabricated Al 2 O 3 /SiO 2 and HfO 2 /SiO 2 MLD mirrors tested at 351 nm using nanosecond pulses. The study is based on the hypothesis that damage initiation can be considered unavoidable due to coating imperfections or contamination, but may not affect laser operation if damage sites remain stable with successive pulses. Modeling of damage-initiation sites revealed that the 3D electric-field intensity governs damage growth. Results show that high-index material significantly affects the damage-growth threshold. Using a high-index material as the outer layer helps confine damage growth to this layer, preventing catastrophic penetration into inner layers.
Source: Optics Express
DOI: 10.1364/oe.612461
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7223202160