Large filters for wide-field survey telescope LSST

Nazario Morgado; Laurent Pinard; Benoit Sassolas; Raffaele Flaminio; Daniéle Forest; Bernard Lagrange; Christophe Michel; Pierre Antilogus

doi:10.1117/12.926071

28 June 2013 Large filters for wide-field survey telescope LSST

Nazario Morgado, Laurent Pinard, Benoit Sassolas, Raffaele Flaminio, Daniéle Forest, Bernard Lagrange, Christophe Michel, Pierre Antilogus

Author Affiliations +

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 84503Q (2013) https://doi.org/10.1117/12.926071
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Nazario Morgado, Laurent Pinard, Benoit Sassolas, Raffaele Flaminio, Daniéle Forest, Bernard Lagrange, Christophe Michel, and Pierre Antilogus "Large filters for wide-field survey telescope LSST", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503Q (28 June 2013); https://doi.org/10.1117/12.926071

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KEYWORDS

Linear filtering

Optical filters

Large Synoptic Survey Telescope

Optical coatings

Mirrors

Absorption

Sensors

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