Long-term aging of SiO 2 /HfO 2 PIAD-deposited Laser Mégajoule polarizer coatings
Year: 2025
Type: article
Abstract: The 176 beams of the Laser Mégajoule (LMJ) are equipped with meter-scale polarizers that filter parasitic light generated before amplification. These multilayer dielectric coatings present instabilities over the years that can lead to a significant transmission loss. To evaluate the causes, HfO 2 and SiO 2 coatings were deposited by evaporation with and without plasma-assistance. Our studies show that a spectral redshift of the polarizers over the years is mainly generated by the SiO 2 layers. A correlation between aging and coatings' moisture sensitivity is evidenced and interpreted as a consequence of water diffusion and the hydrolysis of SiO 2 . Hydrothermal treatments successfully accelerated aging, offering a promising method to stabilize the coating before use.
Source: Optics Express
DOI: 10.1364/oe.564390
Authors: Arthur Soutenain, Marine Chorel, Eric Lavastre, Mathilde Guy, Etienne Laborde, Julie Cornette, Pierre Carles, Eloïse Yvernaud, Yann Launay, Maggy Colas, Marcela Mireles, Amy Rigatti, Cedric Ducros, Christelle Dublanche-Tixier
Institutions: Centre National de la Recherche Scientifique, Institut de Recherche sur les Céramiques, Université de Limoges, University of Rochester, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Laboratoire d’Innovation pour les Technologies des Énergies Nouvelles et les nanomatériaux, CEA Grenoble
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W4414157599