Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Precision Measurements and Metrology II
Q 37.4: Talk
Wednesday, March 13, 2019, 14:45–15:00, S SR 111 Maschb.
Hybrid two-mirror system for low thermal noise and high reflectivity — •Johannes Dickmann1, Tim Käseberg1, Jan Meyer2, Walter Dickmann2, and Stefanie Kroker1,2 — 1Physikalisch-Technische Bundesanstalt Braunschweig, Germany — 2Technische Universität Braunschweig, Germany
Thermal noise limits the sensitivity of many high-precision optical devices like gravitational wave detectors and laser stabilization cavities. We present the analysis and optimization of a two-mirror system consisting of a meta-mirror and a conventional Bragg-mirror for low noise and high reflectivity. The system allows an optimization of the severe noise contributions (Brownian, thermo-elastic and thermo-refractive). The hybrid two-mirror system is optimized for an integration in frequency stabilization Fabry-Pérot cavities and the Einstein Telescope (ET) future gravitational wave detector. It is shown theoretically, that the mirror noise can be reduced to an Allan deviation of less than 10−18 for a tabletop-sized cavity working at 124 K. For ET, the cryogenic expense becomes obsolete.