Multi-Material Coatings with Reduced Thermal Noise

Abstract

The most sensitive measurements of time and space are made with resonant optical cavities, and these measurements are limited by coating thermal noise. The mechanical and optical performance requirements placed on coating materials, especially for interferometric gravitational wave detectors, have proven extremely difficult to meet despite a lengthy search. In this paper we propose a new approach to high performance coatings; the use of multiple materials at different depths in the coating. To support this we generalize previous work on thermal noise in two-material coatings to an arbitrary multi-material stack, and develop a means of estimating absorption in these multi- material coatings. This new approach will allow for a broadening of the search for high performance coating materials.

arXiv comment6 pages, 4 figures

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• Global optimization of multilayer dielectric coatings for precision measurements
• Optimal Design of Coatings for Mirrors of Gravitational Wave Detectors: Analytic Turbo Solution via Herpin Equivalent Layers
• Thermal Noise Reduction in Ternary Optical Coatings: From Ti::GeO${}_2$-Based Ternary Systems to High Index Materials
• Reducing suspension control noise with interferometric sensors -- an experimental concept