We determine the optical properties of amorphous, mixed titania-tantala coatings as a function of the mixing ratio and thermal annealing. The Urbach energy is proposed as a good estimator of the quality of the coatings.
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2022 (v1)PublicationUploaded on: February 4, 2024
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2022 (v1)Publication
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...
Uploaded on: February 11, 2024 -
2020 (v1)Publication
We report on the results of an extensive campaign of optical and mechanical characterization of the ion-beam sputtered oxide layers (Ta2O5, TiO2, Ta2O5-TiO2, SiO2) within the high-reflection coatings of the Advanced LIGO, Advanced Virgo and KAGRA gravitational-wave detectors: Refractive index, thickness, optical absorption, composition,...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
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...
Uploaded on: April 14, 2023