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  Sensitivity improvement of a laser interferometer limited by inelastic back-scattering, employing dual readout

Meinders, M., & Schnabel, R. (2015). Sensitivity improvement of a laser interferometer limited by inelastic back-scattering, employing dual readout. Classical and Quantum Gravity, 32(19): 195004. doi:10.1088/0264-9381/32/19/195004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-9C61-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-9C62-9
Genre: Journal Article

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 Creators:
Meinders, Melanie, Author
Schnabel, Roman1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Data Analysis, Statistics and Probability, physics.data-an, Physics, Instrumentation and Detectors, physics.ins-det, Physics, Optics, physics.optics
 Abstract: Inelastic back-scattering of stray light is a long-standing problem in high-sensitivity interferometric measurements and a potential limitation for advanced gravitational-wave detectors, in particular at sub-audio-band frequencies. The emerging parasitic interferences cannot be distinguished from a scientific signal via conventional single readout. In this work, we propose and demonstrate the subtraction of inelastic back-scatter signals by employing dual homodyne detection on the output light -- here -- of a table-top Michelson interferometer. The additional readout contains solely parasitic signals and is used to model the scatter source. Subtraction of the scatter signal reduces the noise spectral density and thus improves the measurement sensitivity. Our scheme is qualitatively different from the previously demonstrated vetoing of scatter signals and opens a new path for improving the sensitivity of future gravitational-wave detectors.

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 Dates: 2015-01-212015
 Publication Status: Published in print
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 Identifiers: arXiv: 1501.05219
DOI: 10.1088/0264-9381/32/19/195004
URI: http://arxiv.org/abs/1501.05219
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 32 (19) Sequence Number: 195004 Start / End Page: - Identifier: -