Details
| Original language | English |
|---|---|
| Article number | 014030 |
| Number of pages | 14 |
| Journal | Physical review applied |
| Volume | 14 |
| Issue number | 1 |
| Publication status | Published - 10 Jul 2020 |
Abstract
The arm length and the isolation in space enable the Laser Interferometer Space Antenna (LISA) to probe for signals unattainable on the ground, opening a window to the subhertz 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/Hz. An ultrastable interferometer test bed has been developed in order to investigate this issue and validate mitigation strategies in a setup representative of LISA and in this paper it is operated in the long-arm interferometer configuration. The test bed is fitted with a flat-top beam generator to simulate the beam received by a LISA spacecraft. We demonstrate a reduction of TTL coupling between this flat-top beam and a Gaussian reference beam via the introduction of two- and four-lens imaging systems. TTL coupling factors below ±25μm/rad for beam tilts within ±300μrad 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review applied, Vol. 14, No. 1, 014030, 10.07.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Optical Suppression of Tilt-to-Length Coupling in the LISA Long-Arm Interferometer
AU - Chwalla, M.
AU - Danzmann, K.
AU - Fitzsimons, E.
AU - Gerberding, O.
AU - Heinzel, G.
AU - Killow, C.j.
AU - Perreur-lloyd, M.
AU - Robertson, D.i.
AU - Rohr, J.m.
AU - Schuster, S.
AU - Schwarze, T.s.
AU - Tröbs, M.
AU - Wanner, G.
AU - Ward, H.
AU - Dovale Alvarez, M.
AU - Esteban Delgado, J.J.
AU - Barranco, Germán Fernández
AU - Lieser, M.
N1 - We acknowledge funding by the European Space Agency within the project “Optical Bench Development for LISA” (Grant No. 22331/09/NL/HB), support from the United Kingdom Space Agency, University of Glasgow and the Scottish Universities Physics Alliance (SUPA), and support by the Deutsches Zentrum für Luft und Raumfahrt (DLR) with funding from the Bundesministerium für Wirtschaft und Technologie (DLR Project Reference 50 OQ 0601). We thank the German Research Foundation for funding the cluster of Excellence QUEST—Centre for Quantum Engineering and Space-Time Research. We acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG) in the frame of SFB1128 geoQ, project A05 for the optical simulations.
PY - 2020/7/10
Y1 - 2020/7/10
N2 - The arm length and the isolation in space enable the Laser Interferometer Space Antenna (LISA) to probe for signals unattainable on the ground, opening a window to the subhertz 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/Hz. An ultrastable interferometer test bed has been developed in order to investigate this issue and validate mitigation strategies in a setup representative of LISA and in this paper it is operated in the long-arm interferometer configuration. The test bed is fitted with a flat-top beam generator to simulate the beam received by a LISA spacecraft. We demonstrate a reduction of TTL coupling between this flat-top beam and a Gaussian reference beam via the introduction of two- and four-lens imaging systems. TTL coupling factors below ±25μm/rad for beam tilts within ±300μrad 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.
AB - The arm length and the isolation in space enable the Laser Interferometer Space Antenna (LISA) to probe for signals unattainable on the ground, opening a window to the subhertz 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/Hz. An ultrastable interferometer test bed has been developed in order to investigate this issue and validate mitigation strategies in a setup representative of LISA and in this paper it is operated in the long-arm interferometer configuration. The test bed is fitted with a flat-top beam generator to simulate the beam received by a LISA spacecraft. We demonstrate a reduction of TTL coupling between this flat-top beam and a Gaussian reference beam via the introduction of two- and four-lens imaging systems. TTL coupling factors below ±25μm/rad for beam tilts within ±300μrad 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.
UR - http://www.scopus.com/inward/record.url?scp=85088473284&partnerID=8YFLogxK
U2 - 10.1103/PhysRevApplied.14.014030
DO - 10.1103/PhysRevApplied.14.014030
M3 - Article
VL - 14
JO - Physical review applied
JF - Physical review applied
SN - 2331-7019
IS - 1
M1 - 014030
ER -