High-efficiency IR transmission gratings (GRISM) engraved into substrate

Geraud de Villele; Francis Bonnemason; Christian Brach; Jean Flamand; John R Gilchrist; Bruno Touzet; Robert Grange; Bruno Milliard

doi:10.1117/12.514278

26 February 2004 High-efficiency IR transmission gratings (GRISM) engraved into substrate

Geraud de Villele, Francis Bonnemason, Christian Brach, Jean Flamand, John R Gilchrist, Bruno Touzet, Robert Grange, Bruno Milliard

Author Affiliations +

Proceedings Volume 5252, Optical Fabrication, Testing, and Metrology; (2004) https://doi.org/10.1117/12.514278
Event: Optical Systems Design, 2003, St. Etienne, France

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.

Citation Download Citation

Geraud de Villele, Francis Bonnemason, Christian Brach, Jean Flamand, John R Gilchrist, Bruno Touzet, Robert Grange, and Bruno Milliard "High-efficiency IR transmission gratings (GRISM) engraved into substrate", Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004); https://doi.org/10.1117/12.514278

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