Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5252..183d&link_type=abstract
Optical Fabrication, Testing, and Metrology. Edited by Geyl, Roland; Rimmer, David; Wang, Lingli. Proceedings of the SPIE, Volu
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Bonnemason Francis
Brach Christian
de Villele Geraud
Flamand Jean
Gilchrist John R.
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