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Material loss angles from direct measurements of broadband thermal noise

Principe, Maria and Pinto, Innocenzo M. and Pierro, Vincenzo and DeSalvo, Riccardo and Taurasi, Ilaria and Villar, Akira E. and Black, Eric D. and Libbrecht, Kenneth G. and Michel, Christophe and Morgado, Nazario and Pinard, Laurent (2015) Material loss angles from direct measurements of broadband thermal noise. Physical Review D, 91 (2). Art. No. 022005. ISSN 2470-0010. doi:10.1103/PhysRevD.91.022005.

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We estimate the loss angles of the materials currently used in the highly reflective test-mass coatings of interferometric detectors of gravitational waves, namely Silica, Tantala, and Ti-doped Tantala, from direct measurement of coating thermal noise in an optical interferometer testbench, the Caltech TNI. We also present a simple predictive theory for the material properties of amorphous glassy oxide mixtures, which gives results in good agreement with our measurements on Ti-doped Tantala. Alternative measurement methods and results are reviewed, and some critical issues are discussed.

Item Type:Article
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Libbrecht, Kenneth G.0000-0002-8744-3298
Additional Information:© 2015 American Physical Society. Received 27 August 2014. This work has been supported in part by the NSF under Cooperative Agreement No. PHY-0757058 and the Italian National Institute for Nuclear Physics (INFN) under the CSN-V COAT grant. Stimulating discussions with V. B. Braginsky, G. Cagnoli, R. Flaminio, P. Fritschel, G. Harry, K. Kuroda, J. M. Mackowski, I. Martin, N. Mio, and S. Penn are gratefully acknowledged.
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Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Issue or Number:2
Classification Code:PACS numbers: 04.80.Nn, 05.40.Ca, 07.60.Ly, 95.55.Ym
Record Number:CaltechAUTHORS:20150316-084111993
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Official Citation:Principe, M., Pinto, I. M., Pierro, V., DeSalvo, R., Taurasi, I., Villar, A. E., . . . Pinard, L. (2015). Material loss angles from direct measurements of broadband thermal noise. Physical Review D, 91(2), 022005.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55765
Deposited On:16 Mar 2015 21:48
Last Modified:10 Nov 2021 20:49

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