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Proceedings Paper

Enhanced monolithic diffraction gratings with high efficiency and reduced polarization sensitivity for remote sensing applications
Author(s): Peter Triebel; Torsten Diehl; Tobias Moeller; Alexandre Gatto; Alexander Pesch; Lars H. Erdmann; Matthias Burkhardt; Alexander Kalies
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Paper Abstract

Spectral imaging systems lead to enhanced sensing properties when the sensing system provides sufficient spectral resolution to identify materials from its spectral reflectance signature. The performance of diffraction gratings provides an initial way to improve instrumental resolution. Thus, subsequent manufacturing techniques of high quality gratings are essential to significantly improve the spectral performance. The ZEISS unique technology of manufacturing real-blazed profiles and as well as lamellar profiles comprising transparent substrates is well suited for the production of transmission gratings. In order to reduce high order aberrations, aspherical and free-form surfaces can be alternatively processed to allow more degrees of freedom in the optical design of spectroscopic instruments with less optical elements and therefore size and weight advantages. Prism substrates were used to manufacture monolithic GRISM elements for UV to IR spectral range. Many years of expertise in the research and development of optical coatings enable high transmission anti-reflection coatings from the DUV to the NIR. ZEISS has developed specially adapted coating processes (Ion beam sputtering, ion-assisted deposition and so on) for maintaining the micro-structure of blazed gratings in particular. Besides of transmission gratings, numerous spectrometer setups (e.g. Offner, Rowland circle, Czerny-Turner system layout) working on the optical design principles of reflection gratings. This technology steps can be applied to manufacture high quality reflection gratings from the EUV to the IR applications with an outstanding level of low stray light and ghost diffraction order by employing a combination of holography and reactive ion beam etching together with the in-house coating capabilities. We report on results of transmission gratings on plane and curved substrates and GRISM elements with enhanced efficiency of the grating itself combined with low scattered light in the angular distribution. Beside of the results of straylight measurement the actual results on improving efficiency and lowering the polarization sensitivity for transmission gratings will be discussed on theoretical simulations compared to measured data over the entire wavelength range.

Paper Details

Date Published: 8 October 2015
PDF: 9 pages
Proc. SPIE 9641, Optics in Atmospheric Propagation and Adaptive Systems XVIII, 96410H (8 October 2015); doi: 10.1117/12.2194326
Show Author Affiliations
Peter Triebel, Carl Zeiss Spectroscopy GmbH (Germany)
Torsten Diehl, Carl Zeiss Spectroscopy GmbH (Germany)
Tobias Moeller, Carl Zeiss Spectroscopy GmbH (Germany)
Alexandre Gatto, Carl Zeiss Jena GmbH (Germany)
Alexander Pesch, Carl Zeiss Jena GmbH (Germany)
Lars H. Erdmann, Carl Zeiss Jena GmbH (Germany)
Matthias Burkhardt, Carl Zeiss Jena GmbH (Germany)
Alexander Kalies, Carl Zeiss Jena GmbH (Germany)

Published in SPIE Proceedings Vol. 9641:
Optics in Atmospheric Propagation and Adaptive Systems XVIII
Karin U. Stein; John D. Gonglewski, Editor(s)

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