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Martin, I W; Nawrodt, R; Craig, K; Schwarz, C; Bassiri, R; Harry, G; Hough, J; Penn, S; Reid, S; Robie, R; Rowan, S
Classical and quantum gravity, 02/2014, Volume: 31, Issue: 3Journal Article
Thermal noise arising from mechanical dissipation in oxide mirror coatings is an important limit to the sensitivity of future gravitational wave detectors, optical atomic clocks and other precision measurement systems. Here, we present measurements of the temperature dependence of the mechanical dissipation of an ion-beam sputtered silica film between 10 and 300 K. A dissipation peak was observed at 20 K and the low temperature dissipation was found to have significantly different characteristics than observed for bulk silica and silica films deposited by alternative techniques. These results are important for better understanding the underlying mechanisms of mechanical dissipation, and thus thermal noise, in the most commonly-used reflective coatings for precision measurements.
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