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arXiv · 2210.08381

Study on electro-optic noise in crystalline coatings toward future gravitational wave detectors

Satoshi Tanioka·Daniel Vander-Hyde·Garrett D. Cole·Steven D. Penn·Stefan W. Ballmer
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Abstract

Thermal noise in high-reflectivity mirror coatings is a limiting factor in ground-based gravitational wave detectors. Reducing this coating thermal noise improves the sensitivity of detectors and enriches the scientific outcome of observing runs. Crystalline gallium arsenide and aluminum-alloyed gallium arsenide (referred to as AlGaAs) coatings are promising coating candidates for future upgrades of gravitational wave detectors because of their low coating thermal noise. However, AlGaAs-based crystalline coatings may be susceptible to an electro-optic noise induced by fluctuations in an electric field. We investigated the electro-optic effect in an AlGaAs coating by using a Fabry-Perot cavity, and concluded that the noise level is well below the sensitivity of current and planned gravitational-wave detectors.

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Satoshi Tanioka, Daniel Vander-Hyde, Garrett D. Cole, Steven D. Penn, Stefan W. Ballmer. 2022-10-15. Study on electro-optic noise in crystalline coatings toward future gravitational wave detectors. https://doi.org/10.1103/physrevd.107.022003

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