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Margot Hennig (University of Glasgow)20/05/2026, 09:00Thermal noisePresentation
This talk will cover recent developments in amorphous coatings research for Advanced GW Detectors at the University of Glasgow and Strathclyde University. Particularly progress on Titania-Silica coatings, alumina coatings, and multi-material coating designs for room temperature detectors.
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Dr L. O. Mereni (CNRS)20/05/2026, 09:18Thermal noisePresentation
Silicon nitride (SiN$_x$) is a highly versatile coating material. In high-reflection Bragg mirrors, it could be paired either with silica as high-index layer, for operation at any wavelength in the near infrared [1], or with amorphous silicon as low-index layer, for operation at a wavelength of 1550 nm or larger [2]; it could be used at ambient temperature as well as at cryogenic temperatures...
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Dr Valeria Milotti (University of Padova, INFN PD)20/05/2026, 09:36Thermal noisePresentation
Thermal noise arising from mirror coatings (CTN) remains one of the main limitations to enhancing the sensitivity of interferometric gravitational wave detectors, especially in room temperature detectors in the critical frequency region near 100 Hz. These coatings, fabricated by ion beam sputtering as Bragg reflectors alternating high- and low-refractive-index layers, undergo a post-deposition...
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Steven Penn20/05/2026, 09:54Thermal noisePresentation
Current gravitational wave detectors (GWDs) are sensitivity limited by mirror coating thermal noise (CTN). Despite decades of research, GaAs/AlGaAs crystalline coatings are the only coating candidate that has demonstrated a CTN that is capable of meeting the sensitivity goals of LIGO A+ and LIGO A#. These substrate-transferred crystalline coatings exhibit the lowest measured CTN both at room...
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Peter Fritschel (M.I.T.)20/05/2026, 10:12Thermal noisePresentation
The MIT coating thermal noise (CTN) facility can measure the thermal noise of mirror coatings by probing the phase fluctuations between orthogonal spatial modes in a short, folded Fabry-Perot cavity. Previously this instrument has measured the thermal noise of the coatings used in LIGO, with high signal-to-noise ratio in the frequency band of 30 Hz to 3000 Hz. This talk will review some...
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Swadha Pandey (MIT)20/05/2026, 11:00Thermal noisePresentation
We present the design and experimental demonstration of a sub-percent loss dielectric metasurface mirror operating at 1064 nm, the wavelength used in current gravitational wave interferometers. The titanium dioxide nanopillar array on a glass substrate achieves high reflectivity using a single layer. The mirror operates via guided-mode resonance in a periodic dielectric structure designed for...
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Mr Daniel Grass (Caltech)20/05/2026, 11:18Thermal noisePresentation
New experiments are being developed without the background of quantum shot noise to look for weak, high frequency signals using Michelson interferometers. Since shot noise is no longer the dominant noise source with these readout schemes, it is important to accurately model thermal noise to characterize the signal and design more sensitive experiments. However, previous modeling uses...
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Prof. Kentaro Somiya (Institute of Science Tokyo)20/05/2026, 11:36Thermal noisePresentation
Calculation of thermoelastic noise in the suspension fiber in the vertical direction is not only a good exercise to use fluctuation-dissipation theorem in a 1-dimensional solid but also an interesting platform to consider an influence of heat flow at the boundaries. In KAGRA or ET-LF, the heat from the laser absorbed by the test mass is transferred via the suspension fiber. The fiber...
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Brian Lantz20/05/2026, 11:54Thermal noisePresentation
This is an update for the community on the design status of the mirror suspension for A#. The team is making excellent progress on the design. I will report on the latest design update from the 4th suspension workshop at Caltech (Dec 9-11, 2025) and describe how the suspension has evolved from the system in Advanced LIGO. In the spirit of the workshop, I will highlight a few areas where the...
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Ardiana Nela20/05/2026, 12:12Thermal noisePresentation
Future gravitational wave detectors such as the Einstein Telescope and Cosmic Explorer will require cryogenic mirror suspensions with thermal noise significantly below the limits of current fused silica systems. Crystalline silicon is a leading candidate material due to its high mechanical quality factor and favourable thermal properties. Silicon suspension development requires suitable...
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