New grating concepts in the NIR and SWIR spectral band for high resolution earth-observation spectrometers

T. Flügel-Paul; G. Kalkowski; T. Benkenstein; T. Harzendorf; A. Matthes; U. D. Zeitner

doi:10.1117/12.2232538

22 July 2016 New grating concepts in the NIR and SWIR spectral band for high resolution earth-observation spectrometers

T. Flügel-Paul, G. Kalkowski, T. Benkenstein, T. Harzendorf, A. Matthes, U. D. Zeitner

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99122A (2016) https://doi.org/10.1117/12.2232538
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

T. Flügel-Paul, G. Kalkowski, T. Benkenstein, T. Harzendorf, A. Matthes, and U. D. Zeitner "New grating concepts in the NIR and SWIR spectral band for high resolution earth-observation spectrometers", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99122A (22 July 2016); https://doi.org/10.1117/12.2232538

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