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Proceedings Paper

ELOIS: an innovative spectrometer design using a free-form grating
Author(s): Coralie De Clercq; Vincent Moreau; Jean-François Jamoye; Alessandro Zuccaro Marchi; Pierre Gloesener
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Paper Abstract

For spaceborne hyperspectral applications1, grating-based spectrometers are of special interest due to the high spectral resolution and optical throughput that can be achieved. The classical spectrometer designs are 1:1 systems. For these systems the achievable signal to noise ratio is limited by the slit width/pixel pitch combination. One way to increase the signal to noise ratio of a spectrometer without increasing the global instrument size is to design an instrument with a magnification power of less than one. With a smaller magnification, the entrance slit is wider and a larger amount of light is collected while the image is smaller and compatible with typical detector size and pixel pitch. We presents an innovative spectrometer design with 2:1 magnification and high image quality and radiometric performances. This spectrometer called ELOIS (for Enhanced Light Offner Imaging Spectrometer) is designed with a grating atop a free-form surface. The use non-rotationally symmetric surfaces offer additional freedom for designing compact and well-corrected instruments. Nevertheless, most of the available manufacturing techniques, such as direct ruling, holography, lithography or e-beam writing, are typically applicable on simple shape of the grating surface, such as flat or spherical surface. AMOS demonstrated the feasibility of the Free Form Grating (FFG), i.e. a ruled grating on a surface without any rotational symmetry, using cost-effective approach for manufacturing blazed grating by Single Point Diamond Turning (SPDT).

Paper Details

Date Published: 23 September 2015
PDF: 9 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96261O (23 September 2015); doi: 10.1117/12.2191345
Show Author Affiliations
Coralie De Clercq, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Vincent Moreau, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Jean-François Jamoye, Advanced Mechanical and Optical Systems (AMOS) (Belgium)
Alessandro Zuccaro Marchi, European Space Research and Technolgy Ctr. (Netherlands)
Pierre Gloesener, Advanced Mechanical and Optical Systems (AMOS) (Belgium)

Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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