Details
| Original language | English |
|---|---|
| Article number | 105001 |
| Number of pages | 22 |
| Journal | Classical and quantum gravity |
| Volume | 35 |
| Issue number | 10 |
| Publication status | Published - 9 Apr 2018 |
Abstract
Objects sensed by laser interferometers are usually not stable in position or orientation. This angular instability can lead to a coupling of angular tilt to apparent longitudinal displacement - tilt-to-length coupling (TTL). In LISA this is a potential noise source for both the test mass interferometer and the long-arm interferometer. We have experimentally investigated TTL coupling in a setup representative for the LISA test mass interferometer and used this system to characterise two different imaging systems (a two-lens design and a four-lens design) both designed to minimise TTL coupling. We show that both imaging systems meet the LISA requirement of ±25 μm rad -1 for interfering beams with relative angles of up to ±300 μrad. Furthermore, we found a dependency of the TTL coupling on beam properties such as the waist size and location, which we characterised both theoretically and experimentally.
Keywords
- Laser Interferometer Space Antenna, test-mass interferometer, tilt-to-length coupling
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
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In: Classical and quantum gravity, Vol. 35, No. 10, 105001, 09.04.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reducing tilt-to-length coupling for the LISA test mass interferometer
AU - Tröbs, M
AU - Lieser, M
AU - Zwetz, M
AU - Chwalla, M
AU - Danzmann, K
AU - Barránco, G Fernández
AU - Fitzsimons, E D
AU - Gerberding, O
AU - Heinzel, G
AU - Killow, C J
AU - Perreur-lloyd, M
AU - Robertson, D I
AU - Schwarze, T S
AU - Wanner, G
AU - Ward, H
N1 - Funding information: We acknowledge funding by the European Space Agency within the project Optical Bench Development for LISA (22331/09/NL/HB), support from UK Space Agency, University of Glasgow, Scottish Universities Physics Alliance (SUPA), and support by 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. Advanced imaging systems for future gravity missions were investigated in the frame of SFB1128 geo-Q and the dependency on beam parameters shown here was found. The simulations described in section 5 show results found within geo-Q project A05, adapted to the LISA imaging systems. We therefore gratefully acknowledge Deutsche Forschungsgemeinschaft (DFG) for funding geo-Q.
PY - 2018/4/9
Y1 - 2018/4/9
N2 - Objects sensed by laser interferometers are usually not stable in position or orientation. This angular instability can lead to a coupling of angular tilt to apparent longitudinal displacement - tilt-to-length coupling (TTL). In LISA this is a potential noise source for both the test mass interferometer and the long-arm interferometer. We have experimentally investigated TTL coupling in a setup representative for the LISA test mass interferometer and used this system to characterise two different imaging systems (a two-lens design and a four-lens design) both designed to minimise TTL coupling. We show that both imaging systems meet the LISA requirement of ±25 μm rad -1 for interfering beams with relative angles of up to ±300 μrad. Furthermore, we found a dependency of the TTL coupling on beam properties such as the waist size and location, which we characterised both theoretically and experimentally.
AB - Objects sensed by laser interferometers are usually not stable in position or orientation. This angular instability can lead to a coupling of angular tilt to apparent longitudinal displacement - tilt-to-length coupling (TTL). In LISA this is a potential noise source for both the test mass interferometer and the long-arm interferometer. We have experimentally investigated TTL coupling in a setup representative for the LISA test mass interferometer and used this system to characterise two different imaging systems (a two-lens design and a four-lens design) both designed to minimise TTL coupling. We show that both imaging systems meet the LISA requirement of ±25 μm rad -1 for interfering beams with relative angles of up to ±300 μrad. Furthermore, we found a dependency of the TTL coupling on beam properties such as the waist size and location, which we characterised both theoretically and experimentally.
KW - Laser Interferometer Space Antenna
KW - test-mass interferometer
KW - tilt-to-length coupling
UR - http://www.scopus.com/inward/record.url?scp=85046250798&partnerID=8YFLogxK
U2 - 10.1088/1361-6382/aab86c
DO - 10.1088/1361-6382/aab86c
M3 - Article
VL - 35
JO - Classical and quantum gravity
JF - Classical and quantum gravity
SN - 0264-9381
IS - 10
M1 - 105001
ER -