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

ID: 372216.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Nonstationary shot noise and its effect on the sensitivity of interferometers
Authors:Niebauer, T. M.; Schilling, Roland; Danzmann, Karsten; Rüdiger, Albrecht; Winkler, Walter
Date of Publication (YYYY-MM-DD):1991-05
Title of Journal:Physical Review A
Issue / Number:9
Start Page:5022
End Page:5029
Review Status:not specified
Audience:Not Specified
Abstract / Description:We treat the shot noise of a light source modulated in power as a nonstationary random process. The spectrum of such modulated shot noise, although it is still white, is shown to contain correlations between different frequency components. In addition, the noise is not equally distributed in phase. These effects can deteriorate the shot-noise-limited sensitivity of modulated interferometers. Maximizing the signal-to-noise ratio (SNR) introduces constraints on both the modulation and demodulation waveforms. The sensitivities obtained with several commonly used modulation schemes are calculated, and new modulation strategies are proposed to realize good SNR. We apply the results to the case of laser interferometer gravitational wave detectors where it is essential to reach a shot-noise-limited sensitivity. By taking into account the additional noise contribution from the modulated shot noise, we reduce the 3-dB discrepancy between the measured sensitivity of the Garching prototype detector and the theoretical shot-noise limit to about 1.5 dB.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
External Affiliations:Max-Planck-Insitut für Quantenoptik, D-8046 Garching bei München, Germany
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