Effect of heat treatment on mechanical dissipation in Ta2O5 coatings

Martin, I.W. et al. (2010) Effect of heat treatment on mechanical dissipation in Ta2O5 coatings. Classical and Quantum Gravity, 27(22), Art. 225020. (doi: 10.1088/0264-9381/27/22/225020)

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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:Articles
Glasgow Author(s) Enlighten ID:Nawrodt, Dr Ronny and Reid, Professor Stuart and Rowan, Professor Sheila and Martin, Dr Iain and MacLaren, Dr Ian and Hough, Professor James and Bassiri, Mr Riccardo
Authors: Martin, I.W., Bassiri, R., Nawrodt, R., Fejer, M.M., Gretarsson, A., Gustafson, E., Harry, G., Hough, J., MacLaren, I., Penn, S., Reid, S., Route, R., Rowan, S., Schwarz, C., Seidel, P., Scott, J., and Woodcraft, A.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Centre:College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
Journal Name:Classical and Quantum Gravity
Publisher:Institute of Physics
ISSN (Online):1361-6382

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1P&A - PHYSICS & ASTRONOMY