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

ID: 442747.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Coupling of lateral grating displacement to the output ports of a diffractive Fabry-Perot cavity
Authors:Hallam, J.; Chelkowski, S.; Freise, A.; Hild, S.; Barr, B.; Strain, K. A.; Burmeister, O.; Schnabel, R.
Date of Publication (YYYY-MM-DD):2009-08
Title of Journal:Journal of Optics A
Issue / Number:8
Sequence Number of Article:085502
Review Status:not specified
Audience:Not Specified
Abstract / Description:Diffraction gratings have been proposed as core elements in future laser-interferometric gravitational wave detectors. In this paper, we use a steady-state technique to derive coupling of lateral grating displacement to the output ports of a diffractive Fabry–Perot cavity. By introducing a signal to noise ratio (SNR) for each of the three cavity output ports, the magnitudes of the noise sidebands originating from lateral grating displacement are compared to the magnitude of a potential gravitational wave signal. For the example of a 3 km long Fabry–Perot cavity featuring parameters similar to the planned Advanced Virgo instrument, we found that the forward-reflecting grating port offers the highest SNR at low frequencies. Furthermore, for this example suspension requirements for lateral isolation were computed, and a factor of 20 relaxation at a frequency of 10 Hz can be gained over the transmitted port by observing the forward-reflected port.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
Identifiers:ISI:000268692400030 [ID No:1]
ISSN:1464-4258 [ID No:2]
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