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Proceedings Paper

The Smart Tunable Filter for ELT
Author(s): Olivier Hernandez; Claude Carignan; Philippe Amram; Sebastien Balis-Ouellette; Benoît Épinat
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Paper Abstract

The Smart Tunable Filter is a new spectrograph providing a continuous field of view of 4'×4' sampled at 56 mas using the technology of imaging Bragg Tunable Filter (BTF) and a scanning Fabry-Perot tunable filter. 48 holographic gratings photoinscripted helicoidally in a doped glass cylinder and preceded by 4 tunable BTF are used to study 52 emission lines selected between the main OH night sky lines. The Smart Tunable Filter offers the advantage to be an "opto-ecological" system providing a complete separation between spectral and spatial information avoiding problems from image slicing and slit effects. The design can fully operate at cryogenic temperatures for IR purpose. The Fabry-Perot mode operates at a spectral resolution of 5000 and can be removed to provide a 100 spectral resolution over the 48 fixed gratings. Main results obtained in laboratory from the first prototype developed in collaboration with Photon etc. Inc. are presented. Merit factors to compare this instrument to similar ones are studied versus sciences cases.

Paper Details

Date Published: 9 July 2008
PDF: 11 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701477 (9 July 2008); doi: 10.1117/12.787398
Show Author Affiliations
Olivier Hernandez, Ctr. de Recherche en Astrophysique du Québec, Lab. d'Astrophysique Expérimentale, Univ. de Montréal (Canada)
Claude Carignan, Ctr. de Recherche en Astrophysique du Québec, Lab. d'Astrophysique Expérimentale, Univ. de Montréal (Canada)
Observatoire Astronomique de Marseille-Provence, Univ. de Provence (France)
Observatoire d'Astrophysique de l'Univ. de Ouagadougou (Burkina Faso)
Philippe Amram, Observatoire Astronomique de Marseille-Provence, Univ. de Provence (France)
Sebastien Balis-Ouellette, Photon etc. (Canada)
Benoît Épinat, Observatoire Astronomique de Marseille-Provence, Univ. de Provence (France)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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