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Proceedings Paper

Beam combination: all with all
Author(s): E. N. Ribak; M. Gai; S. G. Lipson; P. Parahovnik
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Paper Abstract

One of the concepts of radio interferometry which is very difficult to apply to the visible domain is phase closure. The main difficulty is the spatial requirement, namely that all pencil beams will interfere with all other beams on a flat detector. We use a pair-wise combination method using anamorphic stretching of the beams. All beams are lined up, imaged through a cylindrical lens into a square where each beam is now spread into a parallel line. The comb of lines is made to interfere with a copy of itself rotated at 90°. A rotation shear interferometer is employed for that stage, and the cross pattern of apertures is imaged on the detector. The diagonal shows interference of each beam with itself, for intensity calibration purposes. An extended source clearly reduces contrast on some off-axis patterns, in a symmetric manner. We have already tested two designs in the laboratory using lasers and white light.

Paper Details

Date Published: 28 June 2006
PDF: 6 pages
Proc. SPIE 6268, Advances in Stellar Interferometry, 62681L (28 June 2006); doi: 10.1117/12.677412
Show Author Affiliations
E. N. Ribak, Technion - Israel Institute of Technology (Israel)
M. Gai, Osservatorio Astronomico di Torino, INAF (Italy)
S. G. Lipson, Technion - Israel Institute of Technology (Israel)
P. Parahovnik, Technion - Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 6268:
Advances in Stellar Interferometry
John D. Monnier; Markus Schöller; William C. Danchi, Editor(s)

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