Reduction of coating thermal noise by using an etalon

Abstract

Reduction of coating thermal noise is a key issue in precise measurements with an optical interferometer. A good example of such a measurement device is a gravitational-wave detector, where each mirror is coated by a few tens of quarter-wavelength dielectric layers to achieve high reflectivity while the thermal-noise level increases with the number of layers. One way to realize the reduction of coating thermal noise, recently proposed by Khalili, is the mechanical separation of the first few layers from the rest so that a major part of the fluctuations contributes only little to the phase shift of the reflected light. Using an etalon, a Fabry-Perot optical resonator of a monolithic cavity, with a few coating layers on the front and significantly more on the back surface is a way to realize such a system without too much complexity, and in this paper we perform a thermal-noise analysis of an etalon using the Fluctuation-dissipation theorem with probes on both sides of a finite-size cylindrical mirror.

12 pages, 7 figures

References in corpus (2)

• A Xylophone Configuration for a third Generation Gravitational Wave Detector
• Coating thermal noise of a finite-size cylindrical mirror

Cited by in corpus (6)

• Reducing the effect of thermal noise in optical cavities
• Effect of interference on thermal noise and coating optimization in dielectric mirrors
• Highly reflective low-noise etalon-based meta-mirror
• Calculation of thermal noise in grating reflectors
• Reducing Thermal Noise in Future Gravitational Wave Detectors by employing Khalili Etalons
• Gravitational light deflection in Earth-based laser cavity experiments