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Effect of heat treatment on mechanical dissipation in Ta_2O_5 coatings

Martin, I. W. and Bassiri, R. and Nawrodt, R. and Fejer, M. M. and Gretarsson, A. and Gustafson, E. and Harry, G. and Hough, J. and MacLaren, I. and Penn, S. and Reid, S. and Route, R. and Rowan, S. and Schwarz, C. and Seidel, P. and Scott, J. and Woodcraft, A. L. (2010) Effect of heat treatment on mechanical dissipation in Ta_2O_5 coatings. Classical and Quantum Gravity, 27 (22). Art. No. 225020. ISSN 0264-9381.

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Thermal noise arising from mechanical dissipation in dielectric reflective coatings is expected to critically limit the sensitivity of precision measurement systems such as high-resolution optical spectroscopy, optical frequency standards and future generations of interferometric gravitational wave detectors. We present measurements of the effect of post-deposition heat treatment on the temperature dependence of the mechanical dissipation in ion-beam sputtered tantalum pentoxide between 11 K and 300 K. We find that the temperature dependence of the dissipation is strongly dependent on the temperature at which the heat treatment was carried out, and we have identified three dissipation peaks occurring at different heat treatment temperatures. At temperatures below 200 K, the magnitude of the loss was found to increase with higher heat treatment temperatures, indicating that heat treatment is a significant factor in determining the level of coating thermal noise.

Item Type:Article
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Fejer, M. M.0000-0002-5512-1905
Additional Information:© 2010 IOP Publishing Ltd. Received 27 July 2010, in final form 21 September 2010 Published 27 October 2010. We are grateful for the financial support provided by STFC, the University of Glasgow, EPSRC, the German Science Foundation under contract SFB Transregio 7 and the National Science Foundation under grants PHY-07 57896 and PHY-05 02641 (Stanford) and NSF-0653590 (HWS). IWM and SR are supported by an STFC Postdoctoral Fellowship and a Royal Society of Edinburgh Research Fellowship respectively. RN acknowledges the support of the FP7 EU Einstein Telescope design study project under contract number 211743. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under cooperative agreement PHY-0107417. We would like to thank our colleagues in the LSC and VIRGO collaborations and within SUPA for their interest in this work. This paper has LIGO Document Number LIGO-P1000074.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC) Postdoctoral FellowshipUNSPECIFIED
University of GlasgowUNSPECIFIED
Engineering and Physical Sciences Research Council (EPSRC)UNSPECIFIED
German Science FoundationSFB Transregio 7
NSFPHY-07 57896
NSFPHY-05 02641
Royal Society of Edinburgh Research FellowshipUNSPECIFIED
European Union (EU)211743
Subject Keywords:Instrumentation and measurement; Surfaces, interfaces and thin films; Condensed matter: structural, mechanical & thermal; Gravitation and cosmology; Astrophysics and astroparticles
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO DocumentLIGO-P1000074
Issue or Number:22
Classification Code:PACS: 04.80.Nn; 07.60.Ly; 68.60.Bs; 81.40.Gh; 95.55.Ym. MSC: 83C35
Record Number:CaltechAUTHORS:20101207-133447017
Persistent URL:
Official Citation:I W Martin et al 2010 Class. Quantum Grav. 27 225020 doi: 10.1088/0264-9381/27/22/225020
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21215
Deposited By: Tony Diaz
Deposited On:14 Dec 2010 00:39
Last Modified:09 Mar 2020 13:18

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