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  Coupling of lateral grating displacement to the output ports of a diffractive Fabry-Perot cavity

Hallam, J., Chelkowski, S., Freise, A., Hild, S., Barr, B., Strain, K. A., et al. (2009). Coupling of lateral grating displacement to the output ports of a diffractive Fabry-Perot cavity. Journal of Optics A, 11(8): 085502. doi:10.1088/1464-4258/11/8/085502.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-64B6-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-64B8-2
Genre: Journal Article

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 Creators:
Hallam, J., Author
Chelkowski, S., Author
Freise, A., Author
Hild, S.1, Author              
Barr, B., Author
Strain, K. A.1, Author              
Burmeister, O.2, Author
Schnabel, R.1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24010              

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 Abstract: 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.

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 Dates: 2009-08
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: eDoc: 442747
ISI: 000268692400030
ISSN: 1464-4258
DOI: 10.1088/1464-4258/11/8/085502
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Title: Journal of Optics A
Source Genre: Journal
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Pages: - Volume / Issue: 11 (8) Sequence Number: 085502 Start / End Page: - Identifier: -