Direct Measurement of Coating Thermal Noise in Optical Resonators

Abstract

The best measurements of space and time currently possible (e.g. gravitational wave detectors and optical reference cavities) rely on optical resonators, and are ultimately limited by thermally induced fluctuations in the reflective coatings which form the resonator. We present measurements of coating thermal noise in the audio band and show that for a standard ion beam sputtered coating, the power spectrum of the noise does not have the expected power-law behavior.

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• Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors
• Excess noise and photo-induced effects in highly reflective crystalline mirror coatings
• Optical and mechanical properties of ion-beam-sputtered Nb${}_2$O${}_5$ and TiO${}_2$-Nb${}_2$O${}_5$ thin films for gravitational-wave interferometers
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• Mirror Coating Thermal Noise Mitigation Using Multi-Spatial Mode Cavity Readout
• Characterizing stationary optomechanical entanglement in the presence of non-Markovian noise
• Experimental demonstration of frequency downconverted arm length stabilization for a future upgraded gravitational wave detector
• Thermal Noise Reduction in Ternary Optical Coatings: From Ti::GeO${}_2$-Based Ternary Systems to High Index Materials
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