New spectro-imager designs for MOEMS-based instruments in Earth and Universe observation

Mathieu Vachey; Frédéric Zamkotsian; Vincent Costes; Hervé Benard; Arnaud Liotard; Nicolas Tetaz

doi:10.1117/12.2569670

21 August 2020 New spectro-imager designs for MOEMS-based instruments in Earth and Universe observation

Mathieu Vachey, Frédéric Zamkotsian, Vincent Costes, Hervé Benard, Arnaud Liotard, Nicolas Tetaz

Proceedings Volume 11483, Novel Optical Systems, Methods, and Applications XXIII; 1148308 (2020) https://doi.org/10.1117/12.2569670
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

MOEMS-based instruments could be the next stepping stone for ground-based and space telescopes, allowing for multi-object spectroscopy in a 2D field of view. These programmable slit masks will optimize the SNR and generate compact and efficient spectro-imagers for Universe and Earth observation. BATMAN, a MOEMS-based spectro-imager for Universe observation to be installed at the TNG at the Canaria Islands, uses a Digital-Micromirror-Device to split the light between its imaging and spectrograph arms. ROBIN, the BATMAN demonstrator, confirmed its feasibility and image quality over the FOV. A new design for a DMD-based high-resolution spectro-imager for Universe observation is presented: a solution using only one detector for all the wavelength range is obtained. We are dividing the 370 – 950 nm wavelength range into four channels and a spectral resolution of 15 000 is achieved for every one of them, all within an image quality below two detector pixels. Moreover, the 3-mirror design of the instrument implies a high throughput in comparison to catadioptric systems which are more commonly used for this science case. A new MOEMS-based spectro-imager for Earth observation has been designed, with constraints of wide 2D field of view (3°×1°), image quality (< 2 pixels = 11 μm) and compacity. The instrument is panchromatic with a medium spectral resolution between 1000 and 2000, fitting in a 40 cm × 50 cm × 90 cm box. A 3-mirror solution for both imaging and spectrograph arms has been designed, using only aspheric surfaces thus allowing for easier alignment and tolerancing.

Conference Presentation

Citation Download Citation

Mathieu Vachey, Frédéric Zamkotsian, Vincent Costes, Hervé Benard, Arnaud Liotard, and Nicolas Tetaz "New spectro-imager designs for MOEMS-based instruments in Earth and Universe observation", Proc. SPIE 11483, Novel Optical Systems, Methods, and Applications XXIII, 1148308 (21 August 2020); https://doi.org/10.1117/12.2569670

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