Ward, R. L. and Adhikari, R. and Abbott, B. and Abbott, R. and Barron, D. and Bork, R. and Fricke, T. and Frolov, V. and Heefner, J. and Ivanov, A. and Miyakawa, O. and McKenzie, K. and Slagmolen, B. and Smith, M. and Taylor, R. and Vass, S. and Waldman, S. and Weinstein, A. (2008) dc readout experiment at the Caltech 40m prototype interferometer. Classical and Quantum Gravity, 25 (11). Art. No. 114030. ISSN 0264-9381 http://resolver.caltech.edu/CaltechAUTHORS:WARcqg08
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The Laser Interferometer Gravitational Wave Observatory (LIGO) operates a 40m prototype interferometer on the Caltech campus. The primary mission of the prototype is to serve as an experimental testbed for upgrades to the LIGO interferometers and for gaining experience with advanced interferometric techniques, including detuned resonant sideband extraction (i.e. signal recycling) and dc readout (optical homodyne detection). The former technique will be employed in Advanced LIGO, and the latter in both Enhanced and Advanced LIGO. Using dc readout for gravitational wave signal extraction has several technical advantages, including reduced laser and oscillator noise couplings as well as reduced shot noise, when compared to the traditional rf readout technique (optical heterodyne detection) currently in use in large-scale ground-based interferometric gravitational wave detectors. The Caltech 40m laboratory is currently prototyping a dc readout system for a fully suspended interferometric gravitational wave detector. The system includes an optical filter cavity at the interferometer's output port, and the associated controls and optics to ensure that the filter cavity is optimally coupled to the interferometer. We present the results of measurements to characterize noise couplings in rf and dc readout using this system.
|Additional Information:||Copyright © Institute of Physics and IOP Publishing Limited 2008. Received 31 October 2007, in final form 17 December 2007. Published 15 May 2008. Print publication: Issue 11 (7 June 2008). LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under cooperative agreement PHY-0107417. This paper has LIGO document number LIGO-P070125-00-Z. INVITED AMALDI TALK. Special issue: Proceedings of the 18th International Conference on General Relativity and Gravitation (GRG18) and 7th Edoardo Amaldi Conference on Gravitational Waves (Amaldi7), Sydney, Australia, July 2007 http://www.iop.org/EJ/toc/0264-9381/25/11|
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|Deposited On:||19 May 2008|
|Last Modified:||26 Dec 2012 10:02|
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