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Proceedings Paper

Straylight measurements of immersed gratings for high-resolution spectroscopy in the near infrared
Author(s): J. Fernandez-Saldivar; I. Bhatti; D. Lobb; B. Touzet; B. Guldimann
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Paper Abstract

New immersed grating technology is needed particularly for use in imaging spectrometers that will be used in sensing the atmosphere O2A spectral band (750nm - 775 nm) at spectral resolution in the order of 0.1 nm whilst keeping a high efficiency and low stray light. In this work, an Ion-beam etched grating in a fused-silica substrate of 100 mm 100mm immersed on a prism of the same material is designed to obtain dispersions > 0.30°/nm-1 and 70% efficiency. The optical performance of the immersed grating is modelled and methods to measure its efficiency and scattered radiance are described. The optical setup allows the measurement of an 80mm beam diameter to derive the bidirectional scatter density function (BSDF) from the immersed grating from a minimum angle of 0.1° from the diffracted beam with angular resolution of 0.05°.

Paper Details

Date Published: 21 September 2011
PDF: 10 pages
Proc. SPIE 8167, Optical Design and Engineering IV, 816719 (21 September 2011); doi: 10.1117/12.899889
Show Author Affiliations
J. Fernandez-Saldivar, Surrey Satellite Technology Ltd. (United Kingdom)
I. Bhatti, Surrey Satellite Technology Ltd. (United Kingdom)
D. Lobb, Surrey Satellite Technology Ltd. (United Kingdom)
B. Touzet, Horiba Jobin Yvon SAS (France)
B. Guldimann, European Space Agency Technology Ctr. (Netherlands)

Published in SPIE Proceedings Vol. 8167:
Optical Design and Engineering IV
Jean-Luc M. Tissot; Laurent Mazuray; Rolf Wartmann; Jeffrey M. Raynor; Andrew Wood, Editor(s)

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