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 |
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| 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 |
| Research Centre: | College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research |
| 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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