TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximu...

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Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Mori, Yukino, Nakayama, Yota, Yamamoto, Kazuhiro, Ushiba, Takafumi, Dani`ele Forest, Michel, Christophe, Pinard, Laurent, Teillo, Julien, Cagnoli, Gianpietro
Format: Article
Language:English
Subjects:
Coating effects
Disks
Gravitational waves
Ion beams
Low temperature
Multilayers
Sapphire
Silicon dioxide
Tantalum
Tantalum oxides
Temperature dependence
Thermal noise
Titanium dioxide
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Summary:We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0*10^(-4) (with TiO2) and 7.7*10^(-4) (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence (Phys. Rev. D 74 022002 (2006)). We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.
ISSN:2331-8422