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Bringing mirrors to rest: Grating concepts for ultra-precise interferometry

: Kroker, Stefanie; Kley, Ernst Bernhard; Tünnermann, Andreas


Chang-Hasnain, C.J. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High Contrast Metastructures IV : 11-12 February 2015, San Francisco, California
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9372)
ISBN: 9781628414622
Paper 93720F, 6 pp.
Conference "High Contrast Metastructures" <4, 2015, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
broadband reflectors; diffraction gratings; high precision metrology; high-contrast gratings

Experiments in the field of high precision metrology such as the detection of gravitational waves are crucially limited by the thermal fluctuations of the optical components. In this contribution we present the current state of knowledge of high contrast gratings (HCGs) as low-noise elements for gravitational wave interferometers. We discuss how the properties of HCGs can be tailored such that beside highly reflective mirrors also diffractive beam splitters can be realized. Further, we show the impact of such gratings on the sensitivity of future gravitational wave detectors which can pave the way for the new field of gravitational wave astronomy.