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

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Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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1501.05219.pdf
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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-9C61-B
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.