Reducing tilt-to-length coupling for the LISA test mass interferometer

Tröbs, M. et al. (2018) Reducing tilt-to-length coupling for the LISA test mass interferometer. Classical and Quantum Gravity, 35(10), 105001. (doi: 10.1088/1361-6382/aab86c)

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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.

Item Type:Articles
Keywords:Gravitational waves, LISA, interferometer.
Glasgow Author(s) Enlighten ID:Robertson, Dr David and Ward, Professor Henry and Perreur-Lloyd, Mr Michael and Killow, Dr Christian
Authors: Tröbs, M., Schuster, S., Lieser, M., Zwetz, M., Chwalla, M., Danzmann, K., Barránco, G. F., Fitzsimons, E. D., Gerberding, O., Heinzel, G., Killow, C. J., Perreur-Lloyd, M., Robertson, D. I., Schwarze, T. S., Wanner, G., and Ward, H.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Institute for Gravitational Research
Journal Name:Classical and Quantum Gravity
Publisher:IOP Publishing
ISSN (Online):1361-6382
Published Online:09 April 2018
Copyright Holders:Copyright © 2018 IOP Publishing Ltd
First Published:First published in Classical and Quantum Gravity 35(10): 105001
Publisher Policy:Reproduced under a Creative Commons License
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