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

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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 languageEnglish
Article number231102
Number of pages6
JournalPhysical Review Letters
Volume122
Issue number23
DOIs
Publication statusPublished - 13 Jun 2019

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cryogenics
coating
telescopes
mirrors
coatings
thermal noise
LIGO (observatory)
detectors
gravitational waves
extinction
optical absorption
refractivity
requirements
coefficients

Keywords

  • Einstein telescope
  • cryogenic temperatures
  • gravitational waves

Cite this

Craig, K., Steinlechner, J., Murray, P. G., Bell, A. S., Birney, R., Haughian, K., ... Martin, I. W. (2019). Mirror coating solution for the cryogenic Einstein telescope. Physical Review Letters, 122(23), [231102]. https://doi.org/10.1103/PhysRevLett.122.231102
Craig, Kieran ; Steinlechner, Jessica ; Murray, Peter G. ; Bell, Angus S. ; Birney, Ross ; Haughian, Karen ; Hough, Jim ; MacLaren, Ian ; Penn, Steve ; Reid, Stuart ; Robie, Raymond ; Rowan, Sheila ; Martin, Iain W. / Mirror coating solution for the cryogenic Einstein telescope. In: Physical Review Letters. 2019 ; Vol. 122, No. 23.
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Craig, K, Steinlechner, J, Murray, PG, Bell, AS, Birney, R, Haughian, K, Hough, J, MacLaren, I, Penn, S, Reid, S, Robie, R, Rowan, S & Martin, IW 2019, 'Mirror coating solution for the cryogenic Einstein telescope', Physical Review Letters, vol. 122, no. 23, 231102. https://doi.org/10.1103/PhysRevLett.122.231102

Mirror coating solution for the cryogenic Einstein telescope. / Craig, Kieran; Steinlechner, Jessica; Murray, Peter G.; Bell, Angus S.; Birney, Ross; Haughian, Karen; Hough, Jim; MacLaren, Ian; Penn, Steve; Reid, Stuart; Robie, Raymond; Rowan, Sheila; Martin, Iain W.

In: Physical Review Letters, Vol. 122, No. 23, 231102, 13.06.2019.

Research output: Contribution to journalArticle

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T1 - Mirror coating solution for the cryogenic Einstein telescope

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.

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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.

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Craig K, Steinlechner J, Murray PG, Bell AS, Birney R, Haughian K et al. Mirror coating solution for the cryogenic Einstein telescope. Physical Review Letters. 2019 Jun 13;122(23). 231102. https://doi.org/10.1103/PhysRevLett.122.231102