Real-time phasing and cophasing of an interferometer using a pyramid sensor

Details Real-time phasing and cophasing of an interferometer using a pyramid sensor Real-time phasing and cophasing of an interferometer using a pyramid sensor

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf...69v&link_type=abstract

Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co

Physics

Optics

Scientific paper

The feasibility and remarkable performances of pyramid wavefront sensing in adaptive optics have already been demonstrated. Here We investigate another potential of the pyramid wavefront sensor which is differential piston sensing in interferometry: this can be done by using a glass pyramid placed in a combined focal plane of the interferometer, and a CCD sampling the usual four diffracted images of the pupil, composed here by the interferometer apertures. As the sensor main component, the pyramid, is located directly in the interference pattern of the interferometer, the presence of differential piston modifies, after diffraction by the pyramid, the intensity distribution in the pupil plane which can be used for correction of both the wavefront and the piston. A simulation in the Large binocular case is presented.

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