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Proceedings Paper

Optical very large array (OVLA) prototype telescope: status report and perspective for large mosaic mirrors
Author(s): Julien Dejonghe; Luc Arnold; Olivier Lardiere; Jean-Pierre Berger; Claude Cazale; S. Dutertre; Dominique Kohler; D. Vernet
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Paper Abstract

The OVLA will be a kilometric-size interferometric array of N equals 27 or more 1.5 m telescopes. It is expected to provide visible to infra-red snap-shot images, containing in densified pupil mode N2 10-4 arc-second wide resolved elements in yellow light. The prototype telescope is under construction at Observatoire de Haute Provence and will be connected in 2000 to the GI2T, Grand Interferometre a 2 Telescopes, thus upgraded to a GI3T. The prototype telescope has a spherical mount, well suited for multi- aperture interferometric work, and a thin active 1.5 m f/1.7 mirror weighting only 180 kg with the active cell. This meniscus-shaped mirror, made of low-cost ordinary window glass, is only 24 mm thick and supported by 32 actuators. We describe the telescope optical concept with emphasis on opto-mechanical aspects and the test results of the active optics system. We also discuss the application of this mirror concept to large mosaic mirrors of moderate cost.

Paper Details

Date Published: 25 August 1998
PDF: 11 pages
Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319241
Show Author Affiliations
Julien Dejonghe, Lab. d'Astrophysique Observationelle (France)
Luc Arnold, Observatoire de Haute-Provence (CNRS) (France)
Olivier Lardiere, Observatoire de Haute-Provence (CNRS) (France)
Jean-Pierre Berger, Observatoire de Haute-Provence (CNRS) (France)
Claude Cazale, Observatoire de Haute-Provence (CNRS) (France)
S. Dutertre, Lab. d'Astrophysique Observationelle (France)
Dominique Kohler, Observatoire de Haute-Provence (CNRS) (France)
D. Vernet, Lab. d'Astrophysique Observationelle (France)

Published in SPIE Proceedings Vol. 3352:
Advanced Technology Optical/IR Telescopes VI
Larry M. Stepp, Editor(s)

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