A new method of probing mechanical losses of coatings at cryogenic temperatures
- Galliou, Serge,
- Deléglise, Samuel,
- Goryachev, Maxim,
- Neuhaus, Leonhard,
- Cagnoli, Gianpietro
- Zerkani, Salim,
- Dolique, Vincent
- Bon, Jérémy,
- Vacheret, Xavier,
- Abbé, Philippe,
- Pinard, Laurent
- Michel, Christophe
- Karassouloff, Thibaut,
- Briant, Tristan,
- Cohadon, Pierre-François,
- Heidmann, Antoine,
- Tobar, Michael,
- Bourquin, Roger,
DOIAbstract
International audienceA new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coatings nowadays. The approach is demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10 −5 near 30 MHz at 4 K. The results are compared to the previous measurements
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