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Optical and mechanical properties of ion-beam-sputtered MgF₂ thin films for gravitational-wave interferometers

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arxiv 2111.01646 v2 pith:DO2YMUGU submitted 2021-11-02 physics.ins-det

Optical and mechanical properties of ion-beam-sputtered MgF₂ thin films for gravitational-wave interferometers

classification physics.ins-det
keywords coatingsgravitational-waveopticaldetectorsfilmsion-beam-sputteredmechanicalnoise
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Brownian thermal noise associated with highly reflective coatings is a fundamental limit for several precision experiments, including gravitational-wave detectors. Research is currently ongoing to find coatings with low thermal noise that also fulfill strict optical requirements such as low absorption and scatter. We report on the optical and mechanical properties of ion-beam-sputtered magnesium fluoride thin films, and we discuss the application of such coatings in current and future gravitational-wave detectors.

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