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          Institute: MPI für Gravitationsphysik     Collection: Laser Interferometry & Gravitational Wave Astronomy     Display Documents

ID: 374006.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
dc readout experiment at the Caltech 40m prototype interferometer
Authors:Ward, R. L.; Adhikari, R.; Abbott, B.; Abbott, R.; Barron, D.; Bork, Rolf; Fricke, T.; Frolov, V. V.; Heefner, J.; Ivanov, A.; Miyakawa, O.; McKenzie, K.; Slagmolen, B.; Smith, M.; Taylor, R.; Vass, S.; Waldman, S.; Weinstein, A.
Date of Publication (YYYY-MM-DD):2008-06
Title of Journal:Classical and Quantum Gravity
Volume (in Journal):25
Issue / Number:11
Sequence Number:114030
Name of Conference/Meeting:18th International Conference on General Relativity & Gravitation
Place of Conference/Meeting:Sydney, Australia
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
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