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

Chwalla, M., Danzmann, K., Dovale Alvarez, 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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Chwalla, M., Author
Danzmann, K.1, Author           
Dovale Alvarez, Miguel1, 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
Rohr, J. M.1, Author           
Schuster, S.1, Author           
Schwarze, T.1, Author           
Tröbs, M.1, Author           
Wanner, G.1, Author           
Ward , H., 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: Issued
 Pages: 11 pages, 10 figures
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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: -