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The Laser Interferometer Space Antenna (LISA) is a future space-basedinterferometric gravitational-wave detector consisting of three spacecraft in atriangular configuration. The interferometric measurements of path lengthchanges between satellites will be performed on optical benches in thesatellites. Angular misalignments of the interfering beams couple into thelength measurement and represent a significant noise source. Imaging systemswill be used to reduce this tilt-to-length coupling.  We designed and constructed an optical test bed to experimentally investigatetilt-to-length coupling. It consists of two separate structures, a minimaloptical bench and a telescope simulator. The minimal optical bench comprisesthe science interferometer where the local laser is interfered with light froma remote spacecraft. In our experiment, a simulated version of this receivedbeam is generated on the telescope simulator. The telescope simulator providesa tilting beam, a reference interferometer and an additional static beam as aphase reference. The tilting beam can either be a flat-top beam or a Gaussianbeam. We avoid tilt-to-length coupling in the reference interferometer by usinga small photo diode placed at an image of the beam rotation point. We show thatthe test bed is operational with an initial measurement of tilt-to-lengthcoupling without imaging systems.  Furthermore, we show the design of two different imaging systems whoseperformance will be investigated in future experiments.

Design and construction of an optical test bed for LISA imaging systems and tilt-to-length coupling