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Optical Engineering

Field rotator for the GI2T interferometer
Author(s): Karine Perraut-Rousselet; L. Hill; G. Lasselin-Waultier; Jean-Lucien Boit; Gerard Rousset; Jean-Claude Blanc; Gabriel Moreaux; J. M. Corneloup; S. List; Clothaire Voet
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Paper Abstract

A field rotator dedicated to compensate for the celestial field rotation has been designed and built for the Grand Interferometre a 2 Telescopes (GI2T) by the Laboratoire d'Astronomie Spatiale (LAS). In each interferometric arm, we introduce a three-reflection optics rotatable around the axis of the optical train. Since the visibility of the interference fringe pattern is mostly sensitive to the differential instrumental polarization, this device must fulfill not only optomechanical requirements but also polarization constraints. For this purpose, three metallic reflections at small incidences are preferred to classical K-prisms (such as Dove or Kdenig-Abbe prisms) and coatings optimization leads to protected silver mirrors.

Paper Details

Date Published: 1 February 1998
PDF: 6 pages
Opt. Eng. 37(2) doi: 10.1117/1.602034
Published in: Optical Engineering Volume 37, Issue 2
Show Author Affiliations
Karine Perraut-Rousselet, CNRS (France)
L. Hill, Lab. d'Astronomie Spatiale (France)
G. Lasselin-Waultier, Lab. d'Astronomie Spatiale (France)
Jean-Lucien Boit, Lab. d'Astronomie Spatiale (France)
Gerard Rousset, Lab. d'Astronomie Spatiale (France)
Jean-Claude Blanc, CNRS (France)
Gabriel Moreaux, CNRS (France)
J. M. Corneloup, CNRS (France)
S. List, CNRS (France)
Clothaire Voet, CNRS (France)


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