Matrix heater in the gravitational wave observatory GEO 600

Wittel, H., Affeldt, C., Bisht, A., Doravari, S., Grote, H., Lough, J., Lück, H., Schreiber, E., Strain, K.A. and Danzmann, K. (2018) Matrix heater in the gravitational wave observatory GEO 600. Optics Express, 26(18), pp. 22687-22697. (doi: 10.1364/OE.26.022687)

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Abstract

Large scale laser interferometric gravitational wave detectors (GWDs), such as GEO 600 require high quality optics to reach their design sensitivity. The inevitable surface imperfections, inhomogeneities, and light-absorption induced thermal lensing in the optics, can convert laser light from the fundamental mode to unwanted higher order modes, and pose challenges to the operation and sensitivity of the GWDs. Here we demonstrate the practical implementation of a thermal projection system which reduces those unwanted effects via targeted spatial heating of the optics. The thermal projector consists of 108 individually addressable heating elements which are imaged onto the beam splitter of GEO 600. We describe the optimization of the spatial heating profile and present the obtained results.

Item Type:Articles
Additional Information:The authors are also grateful for support from the Science and Technology Facilities Council (STFC), the University of Glasgow in the UK, the Max Planck Society, the Bundesministerium für Bildung und Forschung (BMBF), the Volkswagen Stiftung, the cluster of excellence QUEST (Centre for Quantum Engineering and Space-Time Research), the international Max Planck Research School (IMPRS), and the State of Niedersachsen in Germany.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Strain, Professor Kenneth
Authors: Wittel, H., Affeldt, C., Bisht, A., Doravari, S., Grote, H., Lough, J., Lück, H., Schreiber, E., Strain, K.A., and Danzmann, K.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN:1094-4087
ISSN (Online):1094-4087
Copyright Holders:Copyright © 2018 Journal
First Published:First published in Optics Express 26(18):22687-22697
Publisher Policy:Reproduced under a Creative Commons License

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