Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-16
Mon.Not.Roy.Astron.Soc.376:1047-1053,2007
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1111/j.1365-2966.2006.11317.x
Long baseline interferometry is now a mature technique in the optical domain. Current interferometers are however highly limited in number of sub apertures and concepts are being developed for future generations of very large optical arrays and especially with the goal of direct imaging. In this paper, we study the effects of introducing single-mode fibers in direct imaging optical interferometers. We show how the flexibility of optical fibers is well adapted to the pupil densification scheme. We study the effects of the truncation of the gaussian beams in the imaging process, either in the Fizeau mode or in the densified pupil mode or in the densified image mode. Finally, in the pupil densification configuration, we identify an optimum of the diaphragm width. This optimum maximizes the on-axis irradiance and corresponds to a trade-off between the loss of transmission and the efficiency of the densification.
Lagarde Stephane
Lardiere Oliver
Mourard Denis
Patru Fabien
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