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Proceedings Paper

High-efficiency IR transmission gratings (GRISM) engraved into substrate
Author(s): Geraud de Villele; Francis Bonnemason; Christian Brach; Jean Flamand; John R Gilchrist; Bruno Touzet; Robert Grange; Bruno Milliard
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Paper Abstract

In Astronomy field, grisms or transmission gratings replicated on a prism are widely used to transmit in line the spectrum. To work in the infrared range, classical grisms present important limitations: the epoxy layer, necessary for replication, absorbs IR light, and in addition this layer constitutes a problem when instrument is used at low temperature. Jobin-Yvon company, in collaboration with LAM in Marseille, France, designed and manufactured a transmission grating engraved directly into IR fused silica substrate. The transmission efficiency of the manufactured grating is 60% to 70% in natural light over the 1.5 to 2.5 microns wavelength range. The number of grooves was 400 g/mm. Other wavelength ranges are possible with similar efficiency, for example: 1.0 to 1.4 microns or 1.4 to 1.9 microns. This grating made only only of fused silica, will survive without problem at any low or very low temperature, or vacuum environment.

Paper Details

Date Published: 26 February 2004
PDF: 9 pages
Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004); doi: 10.1117/12.514278
Show Author Affiliations
Geraud de Villele, Jobin Yvon SA (France)
Francis Bonnemason, Jobin Yvon SA (France)
Christian Brach, Jobin Yvon SA (France)
Jean Flamand, Jobin Yvon SA (France)
John R Gilchrist, Jobin Yvon SA (France)
Bruno Touzet, Jobin Yvon SA (France)
Robert Grange, Lab. d'Astrophysique de Marseille (France)
Bruno Milliard, Lab. d'Astrophysique de Marseille (France)

Published in SPIE Proceedings Vol. 5252:
Optical Fabrication, Testing, and Metrology
Roland Geyl; David Rimmer; Lingli Wang, Editor(s)

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