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Proceedings Paper

Telescope birefringence and phase errors in the Gravity instrument at the VLT interferometer
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Paper Abstract

We use a numerical model of the birefringence in the VLT Interferometer (VLTI) and the Gravity instrument to study the astrometric phase errors that arise when two conditions are simultaneously present: differential birefringence between two VLTI arms, and different polarizations of the science and fringe tracker sources. We present measurements of the VLTI birefringence, that are used to validate our model. We show how a suitable alignment of the eigenvectors of the optical train eliminates the phase error.

Paper Details

Date Published: 24 July 2014
PDF: 15 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91460X (24 July 2014); doi: 10.1117/12.2056304
Show Author Affiliations
B. Lazareff, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
N. Blind, Max-Planck-Institut für extraterrestrische Physik (Germany)
L. Jocou, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
F. Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
K. Perraut, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
S. Lacour, Lab. d’Etudes Spatiales et d’Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
F. Delplancke, European Southern Observatory (Germany)
M. Schoeller, European Southern Observatory (Germany)
A. Amorim, Fundacão da Faculdade de Ciências da Univ. de Lisboa (Portugal)
W. Brandner, Max-Planck-Institut für Astronomie (Germany)
G. Perrin, Lab. d’Etudes Spatiales et d’Instrumentation en Astrophysique, CNRS, Observatoire de Paris à Meudon (France)
C. Straubmeier, Univ. zu Köln (Germany)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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