I Martin et al 2008 Class. Quantum Grav. 25 055005 doi:10.1088/0264-9381/25/5/055005
I Martin1, H Armandula2, C Comtet3, M M Fejer4, A Gretarsson5, G Harry6, J Hough1, J-M M Mackowski3, I MacLaren1, C Michel3, J-L Montorio3, N Morgado3, R Nawrodt7, S Penn8, S Reid1, A Remillieux3, R Route4, S Rowan1, C Schwarz7, P Seidel7, W Vodel7 and A Zimmer7
Show affiliationsThermal noise arising from mechanical dissipation in oxide coatings is a major limitation to many precision measurement systems, including optical frequency standards, high-resolution optical spectroscopy and interferometric gravity wave detectors. Presented here are measurements of dissipation as a function of temperature between 7 K and 290 K in ion-beam-sputtered Ta2O5 doped with TiO2, showing a loss peak at 20 K. Analysis of the peak provides the first evidence of the source of dissipation in doped Ta2O5 coatings, leading to possibilities for the reduction of thermal noise effects.
68.60.Bs Mechanical and acoustical properties
73.50.Td Noise processes and phenomena
04.80.Nn Gravitational wave detectors and experiments
Condensed matter: electrical, magnetic and optical
Issue 5 (7 March 2008)
Received 13 November 2007, in final form 14 January 2008
Published 12 February 2008
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