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  Optical suppression of tilt-to-length coupling in the LISA long-arm interferometer

Chwalla, M., Danzmann, K., Dovale Álvarez, M., Esteban Delgado, J., Fernandez Barranco, G., Fitzsimons, E., et al. (2020). Optical suppression of tilt-to-length coupling in the LISA long-arm interferometer. Physical Review Applied, 14(1): 014030. doi:10.1103/PhysRevApplied.14.014030.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C186-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C952-B
Genre: Journal Article

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Chwalla, M., Author
Danzmann, K.1, Author              
Dovale Álvarez , M.1, Author
Esteban Delgado, J.J.1, Author              
Fernandez Barranco, G.1, Author              
Fitzsimons, E, Author
Gerberding, O.1, Author              
Heinzel, G.1, Author              
Killow, C. J., Author
Lieser , M.1, Author
Perreur-Lloyd, M., Author
Robertson, D. I., Author
Schuster, S.1, Author              
Schwarze, T.1, Author              
Tröbs, M.1, Author              
Wanner, G.1, Author              
Ward , H., Author
Zwetz, M., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Optics, physics.optics
 Abstract: The arm length and the isolation in space enable LISA to probe for signals unattainable on ground, opening a window to the sub-Hz gravitational-wave universe. The coupling of unavoidable angular spacecraft jitter into the longitudinal displacement measurement, an effect known as tilt-to-length (TTL) coupling, is critical for realizing the required sensitivity of picometer$/\sqrt{\rm{Hz}}$. An ultra-stable interferometer testbed has been developed in order to investigate this issue and validate mitigation strategies in a setup representative of the LISA long-arm interferometer. We demonstrate a reduction of TTL coupling between a flat-top beam and a Gaussian beam via introducing two- and four-lens imaging systems. TTL coupling factors below $\pm 25\,\mu$m/rad for beam tilts within $\pm 300\,\mu$rad are obtained by careful optimization of the system. Moreover we show that the additional TTL coupling due to lateral alignment errors of elements of the imaging system can be compensated by introducing lateral shifts of the detector, and vice versa. These findings help validate the suitability of this noise-reduction technique for the LISA long-arm interferometer.

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 Dates: 2020-02-132020
 Publication Status: Published in print
 Pages: 11 pages, 10 figures
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 Rev. Method: -
 Identifiers: arXiv: 2002.05669
URI: http://arxiv.org/abs/2002.05669
DOI: 10.1103/PhysRevApplied.14.014030
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Title: Physical Review Applied
Source Genre: Journal
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Pages: - Volume / Issue: 14 (1) Sequence Number: 014030 Start / End Page: - Identifier: -