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Proceedings Paper

FLUOR fibered instrument at the IOTA interferometer
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Paper Abstract

The FLUOR project started in 1991 with a prototype fiber recombination unit that transformed a pair of independent 80 cm telescopes into a stellar interferometer. An improved version of this unit is now used as part of the instrumentation at the IOTA interferometer on Mt Hopkins (Arizona). The system is based on fluoride glass single-mode waveguides (non polarization-preserving) for observations at infrared wavelengths between 2 and 2.4 μm. A triple coupler performs the coherent recombination of the beams and extracts two calibration signals. A passive polarization control is sufficient to maintain the interferornetric efficiency above 80 %, with variations of the order of a few percents from one night to the next. The combination FLUOR/JOTA now routinely provides stellar interferograms on baselines ranging between 5 and 38 m, with an accuracy of 1 % or better in the fringe visibility measurements.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317153
Show Author Affiliations
Vincent Coude du Foresto, Observatoire de Paris-Meudon (France)
Guy S. Perrin, Observatoire de Paris-Meudon (France)
Cyril Ruilier, Observatoire de Paris-Meudon (France)
Bertrand P. Mennesson, Observatoire de Paris-Meudon (France)
Wesley A. Traub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Marc G. Lacasse, Harvard-Smithsonian Ctr. for Astrophysics (United States)

Published in SPIE Proceedings Vol. 3350:
Astronomical Interferometry
Robert D. Reasenberg, Editor(s)

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