High-Reflection Coatings for Gravitational-Wave Detectors: State of The Art and Future Developments
Alex Amato, Gianpietro Cagnoli, Maurizio Canepa, Elodie Coillet,, Jerome Degallaix, Vincent Dolique, Daniele Forest, Massimo Granata, Val\'erie, Martinez, Christophe Michel, Laurent Pinard, Benoit Sassolas, Julien Teillon
TL;DR
This paper reviews current high-reflection coatings used in gravitational-wave detectors, focusing on material characterization, noise reduction techniques, and proposing sputtered Si3N4 as a promising future mirror coating.
Contribution
It provides a comprehensive overview of the state-of-the-art coating materials and processes, and introduces sputtered Si3N4 as a potential new material for future detectors.
Findings
Optimized doping and deposition parameters reduce thermal noise.
Post-deposition annealing improves coating performance.
Sputtered Si3N4 identified as a promising mirror coating material.
Abstract
We report on the optical, mechanical and structural characterization of the sputtered coating materials of Advanced LIGO, Advanced Virgo and KAGRA gravitational-waves detectors. We present the latest results of our research program aiming at decreasing coating thermal noise through doping, optimization of deposition parameters and post-deposition annealing. Finally, we propose sputtered Si3N4 as a candidate material for the mirrors of future detectors.
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