Abstract

A new fringe tracker based on photon-counting detectors and real-time image processing has been implemented on the Grand Interféromètre à 2 Télescopes at the Observatoire de la Côte d’Azur. Fringe visibilities have been recorded on P Cygni and other stars across the Hα emission line with optical path differences stabilized to between 4 and 7 μm rms (1% of the coherence length). We present our initial results and describe the principle, implementation, and performance of the fringe tracker.

© 1996 Optical Society of America

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