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

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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Cited by in corpus (4)

• Effects of mirror birefringence and its fluctuations to laser interferometric gravitational wave detectors
• Ultrastable lasers: investigations of crystalline mirrors and closed cycle cooling at 124 K
• A potential third-generation gravitational-wave detector based on autocorrelative weak-value amplification
• Birefringence of AlGaAs/GaAs Coatings under Above-Band-Gap Illumination, GR Noise and Photo-Optic Transfer Function