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Proceedings Paper

New grating concepts in the NIR and SWIR spectral band for high resolution earth-observation spectrometers
Author(s): T. Flügel-Paul; G. Kalkowski; T. Benkenstein; T. Harzendorf; A. Matthes; U. D. Zeitner
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Paper Abstract

We report about our latest achievements to realize the diffraction gratings during the development activities for a future Earth observation high resolution spectrometer studied by ESA. The gratings are manufactured by electron beam lithography on fused silica substrates. The optical performance is considerably increased by applying a dedicated high refractive index coating to the grating structure using atomic layer deposition (ALD). Thus, we were able to achieve diffraction efficiencies larger than 75% averaged over both linear polarizations states, i.e. TE and TM. At the same time, the polarization sensitivity is well below 10% in both cases. Finally, the diffraction gratings for the SWIR-1 spectral channel were bonded on a massive prism substrate in order to realize a GRISM element. This process was achieved by direct fused silica bonding performed under atmospheric pressure within special mechanical equipment designed and constructed particularly for this purpose.

Paper Details

Date Published: 22 July 2016
PDF: 7 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99122A (22 July 2016); doi: 10.1117/12.2232538
Show Author Affiliations
T. Flügel-Paul, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
G. Kalkowski, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
T. Benkenstein, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
T. Harzendorf, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
A. Matthes, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
U. D. Zeitner, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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