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  dc readout experiment at the Caltech 40m prototype interferometer

Ward, R. L., Adhikari, R., Abbott, B., Abbott, R., Barron, D., Bork, R., et al. (2008). dc readout experiment at the Caltech 40m prototype interferometer. Classical and Quantum Gravity, 25(11): 114030.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-63DF-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-63E0-0
Genre: Conference Paper

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 Creators:
Ward, R. L.1, Author
Adhikari, R.2, Author
Abbott, B.2, Author
Abbott, R.2, Author
Barron, D.2, Author
Bork, Rolf1, Author
Fricke, T.2, Author
Frolov, V.2, Author
Heefner, J.2, Author
Ivanov, A.2, Author
Miyakawa, O.2, Author
McKenzie, K.2, Author
Slagmolen, B.2, Author
Smith, M.2, Author
Taylor, R.2, Author
Vass, S.2, Author
Waldman, S.2, Author
Weinstein, A.2, Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24010              
2External Organizations, , , ou_persistent22              

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 Abstract: 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.

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 Dates: 2008-06
 Publication Status: Published in print
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 Identifiers: eDoc: 374006
DOI: 10.1088/0264-9381/25/11/114030
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Title: 18th International Conference on General Relativity & Gravitation
Place of Event: Sydney, Australia
Start-/End Date: 2007-07-08 - 2007-07-13

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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 25 (11) Sequence Number: 114030 Start / End Page: - Identifier: ISSN: 1361-6382