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arxiv 2101.02222 v1 pith:5EW37M5M submitted 2021-01-06 physics.ins-det cond-mat.mtrl-sciphysics.app-phphysics.optics

Optical and mechanical properties of ion-beam-sputtered Nb₂O₅ and TiO₂-Nb₂O₅ thin films for gravitational-wave interferometers

classification physics.ins-det cond-mat.mtrl-sciphysics.app-phphysics.optics
keywords coatingsgravitational-wavenoiseopticalpropertiesthermaladvanceddetectors
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Brownian thermal noise associated with highly-reflective mirror coatings is a fundamental limit for several precision experiments, including gravitational-wave detectors. Recently, there has been a worldwide effort to find mirror coatings with improved thermal noise properties that also fulfill strict optical requirements such as low absorption and scatter. We report on the optical and mechanical properties of ion-beam-sputtered niobia and titania-niobia thin films, and we discuss application of such coatings in current and future gravitational-wave detectors. We also report an updated direct coating thermal noise measurement of the HR coatings used in Advanced LIGO and Advanced Virgo.

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