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Published January 15, 2015 | Version Published + Submitted
Journal Article Open

Material loss angles from direct measurements of broadband thermal noise

Creators

  • 1. ROR icon California Institute of Technology

Abstract

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.

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.

Attached Files

Published - PhysRevD.91.022005.pdf

Submitted - 1501.06371.pdf

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1501.06371.pdf

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Additional details

Identifiers

Eprint ID
55765
Resolver ID
CaltechAUTHORS:20150316-084111993

Related works

Describes
http://arxiv.org/abs/1501.06371 (URL)

Funding

NSF
PHY-0757058
Istituto Nazionale di Fisica Nucleare (INFN)

Dates

Created
2015-03-16
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Updated
2021-11-10
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LIGO