Mechanical loss in state-of-the-art amorphous optical coatings

Abstract : We present the results of mechanical characterizations of many different high-quality optical coatings made of ion-beam-sputtered titania-doped tantala and silica, developed originally for interferometric gravitational-wave detectors. Our data show that in multilayer stacks (like high-reflection Bragg mirrors, for example) the measured coating dissipation is systematically higher than the expectation and is correlated with the stress condition in the sample. This has a particular relevance for the noise budget of current advanced gravitational-wave interferometers, and, more generally, for any experiment involving thermal-noise-limited optical cavities.
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Physical Review D, American Physical Society, 2016, 93, 〈10.1103/PhysRevD.93.012007〉
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Massimo Granata, Emeline Saracco, Nazario Morgado, Alix Cajgfinger, Gianpietro Cagnoli, et al.. Mechanical loss in state-of-the-art amorphous optical coatings. Physical Review D, American Physical Society, 2016, 93, 〈10.1103/PhysRevD.93.012007〉. 〈in2p3-01357284〉

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