Measurements of a low temperature mechanical dissipation peak in a single layer of Ta2O5 doped with TiO2

Abstract

Thermal 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.

References in corpus (9)

• Thermal noise in interferometric gravitational wave detectors due to dielectric optical coatings
• Sub-dekahertz ultraviolet spectroscopy of 199Hg+
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• Systematic study of the ${}^{87}$Sr clock transition in an optical lattice
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• Coherence of qubits based on single Ca${}^{+}$ ions
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