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Mechanical loss in tantala/silica dielectric mirror coatings

Steven D Penn1,6, Peter H Sneddon2, Helena Armandula3, Joseph C Betzwieser4, Gianpietro Cagnoli2, Jordan Camp3,7, D R M Crooks2, Martin M Fejer5, Andri M Gretarsson1,8, Gregory M Harry4, Jim Hough2, Scott E Kittelberger1, Michael J Mortonson4, Roger Route5, Sheila Rowan5 and Christophoros C Vassiliou4

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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 coating materials. Our results indicate that the loss is associated with the coating materials and that the loss of Ta2O5 is substantially larger than that of SiO2.


PACS

04.80.Nn Gravitational wave detectors and experiments

68.35.Gy Mechanical properties; surface strains

77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.

MSC

83C35 Gravitational waves

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Gravitation and cosmology

Dates

Issue 13 (7 July 2003)

Received 24 February 2003

Published 12 June 2003



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