Manufacturing method for monolithic freeform Offner-gratings for hyper-spectral imaging

Burkhardt, Matthias; Rathje, Tim; Lehr, Dennis; Erdmann, Lars; Helgert, Michael; Triebel, Peter; Diehl, Torsten; Gatto, Alexandre; Valk, Nick van der; Vink, Ramon; Jansen, R.; Day, James P. R.; Gielesen, W.L.M.

doi:10.1117/12.2532101

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…This new non-planar reflection grating will be a key part of high throughput spectrometers for future space missions. Burkhardt et al [ 44 ] from Carl Zeiss made a convex grating for the European Sentinel 5 mission’s UV-1 imaging spectrometer using the classical plane-wave symmetric holographic exposure optical path. The convex grating substrate is put in the interference field of the two parallel beams for exposure.…”

Section: Fabrication Capability Of Convex Blazed Gratingsmentioning

confidence: 99%

Progress in the Preparation and Characterization of Convex Blazed Gratings for Hyper-Spectral Imaging Spectrometer: A Review

Peng

Guan

et al. 2022

Micromachines

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Convex blazed gratings, which can effectively broaden the spectral range and improve spectral resolution, have gradually evolved into a crucial optical component for lightweight and compact imaging spectroscopy instruments. Their design, processing, and testing involve multidisciplinary interdisciplinary scientific issues, and they continue to be a major area of research in imaging optics applications. This paper summarizes the effects of various grating groove shapes and structural parameters on the spectral range and diffraction efficiency of convex blazed gratings, after providing a brief introduction to the typical functions and applications of convex blazed gratings. Firstly, the latest progress in typical processing methods for convex blazed gratings is reviewed. It focuses on the current fabrication processes and reviews their capabilities in creating convex blazed gratings from three main types of technologies, namely ultra-precision machining, high-energy density beam processing, and chemically assisted fabrication processes. Secondly, the adaptability of the manufacturing process for convex blazed gratings on different scales is summarized, analyzing the adaptation of current procedures to various grating fabrication scales and their bottlenecks. Finally, the characterization methods and future feasible characterization methods for convex blazed gratings are reviewed. The development trend of efficient and precise preparation of convex blazed gratings is pointed out.

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Section: Fabrication Capability Of Convex Blazed Gratingsmentioning

confidence: 99%

Progress in the Preparation and Characterization of Convex Blazed Gratings for Hyper-Spectral Imaging Spectrometer: A Review

Peng

Guan

et al. 2022

Micromachines

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“…Its line spacing is constant in projection and is blazed to stringent straylight, transmission and polarization sensitivity requirements in the UV1 region. The grating substrate is fused silica with an aluminium top layer and is made using a holographic lithographic process by Carl Zeiss GmbH, Germany [4] Finally, the Frown Stray Light Correction plate (FSCP) is a fused silica field lens with a planar back surface to support a graded coating for straylight suppression. Its front surface is defined to correct frown, i.e.…”

Section: Optical Designmentioning

confidence: 99%

Sentinel 5 instrument and UV1 spectrometer subsystem optical design and development

Köhler¹,

Jansen²,

Irizar³

et al. 2021

International Conference on Space Optics — ICSO 2020

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Sentinel-5 is an Earth atmospheric monitoring mission developed within the European Union's Copernicus program. The mission objective is to monitor the composition of the Earth's atmosphere on a daily basis. Airbus DS GmbH acts as the prime contractor under a European Space Agency contract. The instrument design, development, and the instrument verification was and is in many aspects a fruitful co-operation between Airbus and TNO.The first part of this paper illustrates the optical design of the five optical channels of the Sentinel 5 instrument. The innovative compact optical design sets the basis for the acquisition of the variety of trace gas spectra. The design includes a two free-form mirror wide field telescope, a pointing insensitive Dual Babinet Pseudo Depolariser type polarisation scrambler, three one-dimensional waveguide type homogenizers, five reflective and refractive anamorphotic spectrometers including different disperser types as an a-spherical reflective diffraction grating for the ultra-violet, a grism for mainly the visible, a transmissive grating for the near-infrared, and immersed reflective gratings for the short wave infrared spectral ranges.The second part of this paper focusses on the design, qualification and verification of the UV1 spectrometer subsystem. Its optical design is based on an Offner-type spectrometer which has been adapted to employ freeform optics and an aspheric off-axis grating. A monolithic housing structure has been developed for optimum stability, accessibility and easy integration of the optical components. The qualification and performance verification of the first Proto Flight Model of the UV1 spectrometer was successfully completed in July 2020.

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Design and first light of the Sentinel-5 UV1 spectrometer optics

Jansen

Day

Vink

et al. 2019

Sensors, Systems, and Next-Generation Satellites XXIII

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Manufacturing method for monolithic freeform Offner-gratings for hyper-spectral imaging

Cited by 6 publications

References 11 publications

Progress in the Preparation and Characterization of Convex Blazed Gratings for Hyper-Spectral Imaging Spectrometer: A Review

Progress in the Preparation and Characterization of Convex Blazed Gratings for Hyper-Spectral Imaging Spectrometer: A Review

Sentinel 5 instrument and UV1 spectrometer subsystem optical design and development

Design and first light of the Sentinel-5 UV1 spectrometer optics

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