Polarization effects in stellar interferometry

Karine Perraut-Rousselet; Farrokh Vakili; Denis Mourard

doi:10.1117/1.600978

Abstract

We develop a general formalism for describing the polarization effects in stellar interferometers. We show that celestial field rotation and phase delays between the s and p fringe patterns are first order effects. Experiments in laboratory partially check our modeling and thanks to these measurements we optimize a field rotator to compensate the visibility losses due to celestial field rotation. Then we predict the visibility functions of the Grand Interférométre á 2 Télescopes (GI2T) of the Observatoire de la Cóte d’Azur with its present beam combiner and with the future Recombinateur pour Grand Interférométre (REGAIN): the field rotator enables an increase in the observation time by more than 3 hours. Finally, we compare our results to observations done with the GI2T and we emphasize the importance of such calibrations with a polarimetric mode whose principle is validated.

Citation Download Citation

Karine Perraut-Rousselet, Farrokh Vakili, Denis Mourard, "Polarization effects in stellar interferometry," Optical Engineering 35(10), (1 October 1996). https://doi.org/10.1117/1.600978

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