Airbus Defence and Space GmbH currently investigates a number of promising payload concepts for interferometric space-bourne gravitational wave observatories; focusing on beam pointing for the laser links.¹ To this end, one of the setups implements “In-Field Pointing (IFP)”, which is a payload design employing the actuation of a tiltable mirror positioned in an intermediate pupil plane of a wide field off-axis telescope. Here, the lateral alignment of actuated mirror and relay stages imaging the intermediate pupil to the detector plane using tilt-to-length coupling effects will be discussed.

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Nils F. Hasselmann, Christina Brugger, Tim Vogel, Ewan D. Fitzsimsons, Ulrich Johann, Gerhard Heinzel, Dennis Weise, and Alexander Sell, "LISA optical metrology: tilt-to-pathlength coupling effects on the picometer scale," Proc. SPIE 11852, International Conference on Space Optics — ICSO 2020, 1185242 (Presented at International Conference on Space Optics — ICSO 2021: 11 June 2021; Published: 11 June 2021); https://doi.org/10.1117/12.2599636.