Measurement of the mechanical loss of prototype GaP/AlGaP crystalline coatings for future gravitational wave detectors

Cumming, A. et al. (2015) Measurement of the mechanical loss of prototype GaP/AlGaP crystalline coatings for future gravitational wave detectors. Classical and Quantum Gravity, 32(3), 035002. (doi: 10.1088/0264-9381/32/3/035002)

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Thermal noise associated with the dielectric optical coatings used to form the mirrors of interferometric gravitational wave detectors is expected to be an important limit to the sensitivity of future detectors. Improvements in detector performance are likely to require coating materials of lower mechanical dissipation. Typically, current coatings use multiple alternating layers of ion-beam-sputtered amorphous silica and tantalum pentoxide (doped with titania). We present here measurements of the mechanical dissipation of promising alternative crystalline coatings that use multi-layers of single crystal gallium phosphide (GaP) and aluminium gallium phosphide (AlGaP) that are epitaxially grown and lattice matched to a silicon substrate. Analysis shows that the dissipation of the crystalline coating materials appears to be significantly lower than that of the currently used amorphous coatings, potentially enabling a reduction of coating thermal noise in future gravitational wave detectors.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Nawrodt, Dr Ronny and Rowan, Professor Sheila and Martin, Dr Iain and Cumming, Dr Alan and Cunningham, Dr Liam and Bassiri, Mr Riccardo and Haughian, Dr Karen
Authors: Cumming, A., Martin, I., Bassiri, R., Cunningham, L., Fejer, M., Harris, J., Haughian, K., Heinert, D., Lantz, B., Lin, A., Markosyan, A., Nawrodt, R., Route, R., and Rowan, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Classical and Quantum Gravity
Publisher:Institute of Physics Publishing Ltd.
ISSN (Online):1361-6382
Copyright Holders:Copyright © 2015 IOP Publishing Ltd
First Published:First published in Classical and Quantum Gravity 32(3):035002
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459313Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/J000361/1P&A - PHYSICS & ASTRONOMY