Mirror coating solution for the cryogenic Einstein Telescope

Kieran Craig; Jessica Steinlechner; Peter G. Murray; Angus S. Bell; Ross Birney; Karen Haughian; Jim Hough; Ian MacLaren; Steve Penn; Stuart Reid; Raymond Robie; Sheila Rowan; Iain W. Martin

doi:10.1103/PhysRevLett.122.231102

Mirror coating solution for the cryogenic Einstein Telescope

Kieran Craig, Jessica Steinlechner, Peter G. Murray, Angus S. Bell, Ross Birney, Karen Haughian, Jim Hough, Ian MacLaren, Steve Penn, Stuart Reid, Raymond Robie, Sheila Rowan, Iain W. Martin^*

^*Corresponding author for this work

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

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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 SiO2 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 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

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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 SiO2 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 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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year = "2019",

month = jun,

day = "13",

doi = "10.1103/PhysRevLett.122.231102",

language = "English",

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journal = "Physical Review Letters",

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AU - Craig, Kieran

AU - Steinlechner, Jessica

AU - Murray, Peter G.

AU - Bell, Angus S.

AU - Birney, Ross

AU - Haughian, Karen

AU - Hough, Jim

AU - MacLaren, Ian

AU - Penn, Steve

AU - Reid, Stuart

AU - Robie, Raymond

AU - Rowan, Sheila

AU - Martin, Iain 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 SiO2 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 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 SiO2 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 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.

U2 - 10.1103/PhysRevLett.122.231102

DO - 10.1103/PhysRevLett.122.231102

M3 - Article

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 23

M1 - 231102

ER -

Mirror coating solution for the cryogenic Einstein Telescope

Abstract

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