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

ID: 374053.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Measurement and simulation of laser power noise in GEO 600
Authors:Smith, J. R.; Degallaix, Jerome; Freise, Andreas; Grote, Hartmut; Hewitson, Martin; Hild, Stefan; Lück, Harald; Strain, Kenneth A.; Willke, Benno
Date of Publication (YYYY-MM-DD):2008-02
Title of Journal:Classical and Quantum Gravity
Issue / Number:3
Sequence Number of Article:035003
Review Status:not specified
Audience:Not Specified
Abstract / Description:This paper describes measurements and simulations related to power fluctuations of the laser light in the GEO 600 laser-interferometric gravitational wave detector. Measurements of the relative fluctuations of the light power at three different ports of the main interferometer are presented. In addition, measurements and simulations of the coupling transfer functions from power fluctuations at the input laser to these ports are shown. The transfer function from the input laser to the output port of the interferometer is found to be non-trivial. Despite this, the numerical simulation produces an excellent match to it and gives insight to the mechanisms leading to the complicated shape. Furthermore, the coupling transfer functions of power fluctuations to the main (heterodyne) detector outputs are measured and simulated. These are used to evaluate the level with which laser power fluctuations contribute to the overall noise level of the instrument.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/GEO 600
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