Mechanical Loss in Tantala/Silica Dielectric Mirror Coatings

Current interferometric gravitational wave detectors use test masses with mirror coatings formed from multiple layers of dielectric materials, most commonly alternating layers of SiO2 (silica) and Ta2O5 (tantala). However, mechanical loss in the Ta2O5/SiO2 coatings may limit the design sensitivity f...

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Bibliographic Details
Published inarXiv.org
Main Authors Penn, Steven D, Sneddon, Peter H, Armandula, Helena, Betzwieser, Joseph C, Cagnoli, Gianpietro, Camp, Jordan, Crooks, D R M, Fejer, Martin M, Gretarsson, Andri M, Harry, Gregory M, Hough, Jim, Kittelberger, Scott E, Mortonson, Michael J, Route, Roger, Rowan, Sheila, Vassiliou, Christophoros C
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.02.2003
Subjects
Coatings
Detectors
Dielectrics
Gravitational waves
Protective coatings
Silicon dioxide
Substrates
Tantalum
Tantalum oxides
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Summary:Current interferometric gravitational wave detectors use test masses with mirror coatings formed from multiple layers of dielectric materials, most commonly alternating layers of SiO2 (silica) and Ta2O5 (tantala). However, mechanical loss in the Ta2O5/SiO2 coatings may limit the design sensitivity for advanced detectors. We have investigated sources of mechanical loss in the Ta2O5/SiO2 coatings, including loss associated with the coating-substrate interface, with the coating-layer interfaces, and with the bulk material. Our results indicate that the loss is associated with the bulk coating materials and that the loss of Ta2O5 is substantially larger than that of SiO2.
ISSN:2331-8422
DOI:10.48550/arxiv.0302093