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Proceedings Paper

Large filters for wide-field survey telescope LSST
Author(s): Nazario Morgado; Laurent Pinard; Benoit Sassolas; Raffaele Flaminio; Daniéle Forest; Bernard Lagrange; Christophe Michel; Pierre Antilogus
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Paper Abstract

The LSST design foresees the use of six wide-band large optical filters that can alternatively be moved in front of the CCD camera. Each of the six filters has a different band-pass covering all the wavelengths from 300 nm to 1200 nm. The way to achieve this is to coat an optimized optical thin films stack on a filter substrate. Each filter requires a specific design using specific appropriate materials. The main characteristics of these filters, that constitute a real technological challenge, are: their relatively large size - their radii of curvature (about 5.6 m) that represent a sagitta of 12,5 mm that increases the uniformity complexity, the large rejection band requirements with transmission lower than 0.01 % out of the band and a transmission of 95 % over the band-pass. This paper proposes to show the problematic and the results obtained at LMA (Laboratoire des Matériaux Avancés-FRANCE) to the purpose of realizing these filters using the IBS (Ion Beam Sputtering) deposition technique. The results obtained with High-Pass/Low-Pass structures will be presented. Experimental results will be shown concerning the R-band filter (552-691 nm). An overview of the work to be done to realize transmittance map over large filters will be given.

Paper Details

Date Published: 28 June 2013
PDF: 13 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503Q (28 June 2013); doi: 10.1117/12.926071
Show Author Affiliations
Nazario Morgado, Lab. des Matériaux Avancés, CNRS (France)
Laurent Pinard, Lab. des Matériaux Avancés, CNRS (France)
Benoit Sassolas, Lab. des Matériaux Avancés, CNRS (France)
Raffaele Flaminio, Lab. des Matériaux Avancés, CNRS (France)
Daniéle Forest, Lab. des Matériaux Avancés, CNRS (France)
Bernard Lagrange, Lab. des Matériaux Avancés, CNRS (France)
Christophe Michel, Lab. des Matériaux Avancés, CNRS (France)
Pierre Antilogus, Lab. de Physique Nucléaire et de Hautes Energies (France)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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