Mirror Coating Solution for the Cryogenic Einstein Telescope

K. Craig; J. Steinlechner; P.G. Murray; A.S. Bell; R. Birney; K. Haughian; J. Hough; I. MacLaren; S. Penn; S. Reid; R. Robie; S. Rowan; I.W. Martin

doi:10.1103/PhysRevLett.122.231102

Mirror Coating Solution for the Cryogenic Einstein Telescope

K. Craig, J. Steinlechner, P.G. Murray, A.S. Bell, R. Birney, K. Haughian, J. Hough, I. MacLaren, S. Penn, S. Reid, R. Robie, S. Rowan, I.W. Martin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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 HfO2 doped with SiO(2 )as a new coating material for future detectors. Our measurements show an extinction coefficient of k = 6 x 10(-6) and a mechanical loss of phi = 3.8 x 10(-4) at 10 K, which is a factor of 2 below that of SiO2, the currently used low refractive-index coating material. These properties make HfO2 doped with SiO2 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.

Original language	English
Article number	231102
Number of pages	6
Journal	Physical Review Letters
Volume	122
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.122.231102
Publication status	Published - 13 Jun 2019
Externally published	Yes

Keywords

INTERNAL-FRICTION
SILICON

Access to Document

10.1103/PhysRevLett.122.231102

Cite this

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title = "Mirror Coating Solution for the Cryogenic Einstein Telescope",

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 HfO2 doped with SiO(2 )as a new coating material for future detectors. Our measurements show an extinction coefficient of k = 6 x 10(-6) and a mechanical loss of phi = 3.8 x 10(-4) at 10 K, which is a factor of 2 below that of SiO2, the currently used low refractive-index coating material. These properties make HfO2 doped with SiO2 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.",

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T1 - Mirror Coating Solution for the Cryogenic Einstein Telescope

AU - Craig, K.

AU - Steinlechner, J.

AU - Murray, P.G.

AU - Bell, A.S.

AU - Birney, R.

AU - Haughian, K.

AU - Hough, J.

AU - MacLaren, I.

AU - Penn, S.

AU - Reid, S.

AU - Robie, R.

AU - Rowan, S.

AU - Martin, I.W.

PY - 2019/6/13

Y1 - 2019/6/13

N2 - 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 HfO2 doped with SiO(2 )as a new coating material for future detectors. Our measurements show an extinction coefficient of k = 6 x 10(-6) and a mechanical loss of phi = 3.8 x 10(-4) at 10 K, which is a factor of 2 below that of SiO2, the currently used low refractive-index coating material. These properties make HfO2 doped with SiO2 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.

AB - 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 HfO2 doped with SiO(2 )as a new coating material for future detectors. Our measurements show an extinction coefficient of k = 6 x 10(-6) and a mechanical loss of phi = 3.8 x 10(-4) at 10 K, which is a factor of 2 below that of SiO2, the currently used low refractive-index coating material. These properties make HfO2 doped with SiO2 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.

KW - INTERNAL-FRICTION

KW - SILICON

U2 - 10.1103/PhysRevLett.122.231102

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