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Proceedings Paper • Open Access

Bulk silica NIR blazed transmission gratings made by Silios technologies
Author(s): Amandine Caillat; Sandrine Pascal; Stéphane Tisserand; Kjetil Dohlen; Robert Grange; Vincent Sauget; Sophie Gautier

Paper Abstract

In order to study the dark universe (energy and matter), EUCLID space mission will collect near infrared spectra and images of millions of galaxies. This massive measurement survey requires a slitless spectroscopic channel including GRISMs (for “Grating pRISMs”) in NISP (Near Infrared SpectroPhotometer). Very special technical specifications are required for the grating manufacturing: large aperture, low groove frequency and blaze angle, line curvature. In addition, it has to withstand space environment. Therefore, in the frame of a R&D project funded by the CNES, we developed bulk silica gratings in close collaboration with the French company SILIOS Technologies. SILIOS delivered two resin-free blazed gratings with curved lines engraved directly into the fused silica substrate of 80mm and 108mm useful aperture. At LAM, we measured very high optical performances of these prototypes: <80% transmitted efficiency, <30nm RMS wavefront error, groove shape and roughness very close to theory and uniform over the useful aperture. In this paper, we give specifications of these gratings, we describe the manufacturing process developed by SILIOS Technologies, we present briefly optical setups and models allowing optical performances verifications at LAM and we show very encouraging results obtained on the two gratings.

Paper Details

Date Published: 17 November 2017
PDF: 8 pages
Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105630O (17 November 2017); doi: 10.1117/12.2304211
Show Author Affiliations
Amandine Caillat, Lab. d'Astrophysique de Marseille (France)
Sandrine Pascal, Lab. d'Astrophysique de Marseille (France)
Stéphane Tisserand, SILIOS Technologies (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (France)
Robert Grange, Lab. d'Astrophysique de Marseille (France)
Vincent Sauget, SILIOS Technologies (France)
Sophie Gautier, SILIOS Technologies (France)

Published in SPIE Proceedings Vol. 10563:
International Conference on Space Optics — ICSO 2014
Zoran Sodnik; Bruno Cugny; Nikos Karafolas, Editor(s)

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