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Mirror Coating Solution for the Cryogenic Einstein Telescope
- Source :
- Physical Review Letters, 122(23):231102. American Physical Society
- Publication Year :
- 2019
-
Abstract
- Planned cryogenic gravitational-wave detectors will require improved coatings with a strain thermal noise reduced by a factor of 25 compared to Advanced LIGO. We present investigations of HfO_{2} doped with SiO_{2} as a new coating material for future detectors. Our measurements show an extinction coefficient of k=6×10^{-6} and a mechanical loss of ϕ=3.8×10^{-4} at 10 K, which is a factor of 2 below that of SiO_{2}, the currently used low refractive-index coating material. These properties make HfO_{2} doped with SiO_{2} ideally suited as a low-index partner material for use with a-Si in the lower part of a multimaterial coating. Based on these results, we present a multimaterial coating design which, for the first time, can simultaneously meet the strict requirements on optical absorption and thermal noise of the cryogenic Einstein Telescope.
- Subjects :
- Materials science
Einstein Telescope
Physics::Instrumentation and Detectors
business.industry
Gravitational wave
Detector
General Physics and Astronomy
Cryogenics
engineering.material
01 natural sciences
LIGO
Condensed Matter::Materials Science
INTERNAL-FRICTION
Optics
Coating
TA164
0103 physical sciences
engineering
010306 general physics
Absorption (electromagnetic radiation)
business
SILICON
Refractive index
QC
Subjects
Details
- Language :
- English
- ISSN :
- 00319007 and 10797114
- Volume :
- 122
- Issue :
- 23
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....b0e6ee36132225403c0888c124ae2de8