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Proceedings Paper

Long baseline interferometry in the visible: first results of the FRIEND project
Author(s): M. A. Martinod; P. Berio; D. Mourard; K. Perraut; A. Meilland; F. Millour; J. M. Clausse; A. Spang; Y. Bresson; J. Dejonghe; C. Bailet; I. Tallon-Bosc; M. Tallon
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Paper Abstract

In the coming year, the CHARA 1-meter telescopes will be equipped with Adaptive Optics (AO) systems. This improvement opens the possibility to apply, in the visible domain, the principle of spatial filtering with single mode fibers well demonstrated in the near-infrared. It will clearly open new astrophysical fields by taking benefit of an improved sensitivity and state-of-the-art precision and accuracy on interferometric observables. A demonstrator called FRIEND (Fibered and spectrally Resolved Interferometric Experiment - New Design) has been developed. FRIEND combines the beams coming from 3 telescopes after injection in single mode optical fibers and provides photometric channels as well as some spectral capabilities for characterization purposes. It operates around the R spectral band (from 600nm to 750nm) and uses the fast and sensitive analog detector OCAM2. On sky tests at the focus of the CHARA interferometer have been performed during the last year to get the optimal DIT or an estimation of the stability of the instrumental visibility. Complementary lab tests have permitted to characterize the birefringence of the fibers, and the characteristics of the detector. In this paper, we present the results of these tests.

Paper Details

Date Published: 4 August 2016
PDF: 17 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99071H (4 August 2016); doi: 10.1117/12.2231704
Show Author Affiliations
M. A. Martinod, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
P. Berio, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
D. Mourard, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
K. Perraut, Univ. Grenoble Alpes, IPAG, CNRS (France)
A. Meilland, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
F. Millour, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
J. M. Clausse, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
A. Spang, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
Y. Bresson, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
J. Dejonghe, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
C. Bailet, Lab. Lagrange, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (France)
I. Tallon-Bosc, Univ. Lyon, Univ. Lyon 1, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
M. Tallon, Univ. Lyon, Univ. Lyon 1, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)


Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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