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Image plane beam combination in optical interferometers multiplexes theinterference fringes from multiple baselines onto a single detector. The beamsof starlight are arranged in a non-redundant pattern at the entrance of thecombiner so that the signal from each baseline can be separated from oneanother in the frequency domain. If the signals from different baselinesoverlap in the frequency domain, this can give rise to a systematic error inthe fringe measurements known as baseline crosstalk. In this paper we quantifycrosstalk arising from the combination of atmospheric seeing and beampropagation over distances of order hundreds of metres. We find that inidealised conditions atmospheric wavefront errors and beam propagation do notcontribute to crosstalk. However, when aperture stops are included in theoptical beam train we observe that wavefront errors can result in squaredvisibility errors arising from crosstalk as high as $\Delta V^{2} =6.6\times10^{-3}$ under realistic observing conditions.

Crosstalk in image plane beam combination for optical interferometers