Share Email Print
cover

Proceedings Paper

Efficiency measurements performed on the MUSE VPHG
Author(s): Edgard Renault; Magali Loupias; Louisa Adjali; James A. Arns; Roland M. Bacon; Didier Boudon; Patrick Caillier; Paul Coadour; Hans Dekker; Jean-Pierre Dubois; Johan Kosmalski; Laurent Pinard; Alban Remillieux
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Volume Phase Holographic Gratings (VPHG) are key elements for the second generation instrument MUSE (Multi Unit Spectroscopic Explorer) developed for the VLT (Very Large Telescope) for ESO (European Southern Observatory). MUSE operates in the visible wavelength range (465-930nm) and is composed of 24 spectrographs including one VPHG each. This article briefly describes the design of the grating manufactured by Kaiser Optical Systems, to reach the MUSE spectral resolution and efficiency. On the other hand the set up developed in CRAL (Centre de Recherche Astrophysique de Lyon) to test the VPHG final performance is deeply discussed. This set up uses a broadband source coupled to a monochromator, and a compensation arm to remove the source intensity fluctuations. The source is amplitude modulated by a chopper, and a lock-in amplifier extracts the modulated signal from the photodiodes. The measurement arm scans the 0, 1st and 2nd diffraction orders of the grating and allows tests of different areas over its whole surface of 120mm*60mm. The accuracy reached is below one percent in efficiency, allows us to validate the performance and its uniformity over the surface of the gratings.

Paper Details

Date Published: 20 July 2010
PDF: 11 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77394R (20 July 2010); doi: 10.1117/12.857198
Show Author Affiliations
Edgard Renault, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Magali Loupias, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Louisa Adjali, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
James A. Arns, Kaiser Optical Systems, Inc. (United States)
Roland M. Bacon, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Didier Boudon, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Patrick Caillier, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Paul Coadour, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Hans Dekker, European Southern Observatory (Germany)
Jean-Pierre Dubois, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Johan Kosmalski, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Laurent Pinard, Lab. des Matériaux Avancés, CNRS (France)
Alban Remillieux, Univ. de Lyon (France)
Observatoire de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

© SPIE. Terms of Use
Back to Top