Steven D Penn 1,6, Peter H Sneddon 2, Helena Armandula 3, Joseph C Betzwieser 4, Gianpietro Cagnoli 2, Jordan Camp 3,7, D R M Crooks 2, Martin M Fejer 5, Andri M Gretarsson 1,8, Gregory M Harry 4, Jim Hough 2, Scott E Kittelberger 1, Michael J Mortonson 4, Roger Route 5, Sheila Rowan 5 and Christophoros C Vassiliou 4
1
Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA
2
Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
3
LIGO Laboratory, California Institute of Technology, Pasadena, CA 91025, USA
4
LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5
Edward L Ginzton Laboratory, Stanford University, Stanford, CA 94305-4085, USA
6
Present address: Department of Physics, Hobart and William Smith Colleges, Geneva, New York, 14456, USA.
7
Present address: Laboratory for High Energy Astrophysics, NASA/Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA.
8
Present address: LIGO Livingston Observatory, Livingston, Louisiana, 70754, USA.
Classical and Quantum Gravity Create an alert RSS this journal
S D Penn et al 2003 Class. Quantum Grav. 20 2917
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.
04.80.Nn Gravitational wave detectors and experiments
68.35.Gy Mechanical properties; surface strains
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
Condensed matter: electrical, magnetic and optical
Issue 13 (7 July 2003)
Received 24 February 2003
Published 12 June 2003
S D Penn et al 2003 Class. Quantum Grav. 20 2917
P Graneau 1989 J. Phys. D: Appl. Phys. 22 1083
J Weiszburg 1966 Br. J. Appl. Phys. 17 693
Y Ozeki 1995 J. Phys. A: Math. Gen. 28 3645
L Vitushkin et al 2002 Metrologia 39 407