Dr. Mathieu Vachey Profile

Dr. Mathieu Vachey

at Lab d'Astrophysique de Marseille

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Publications (4)

Proceedings Article | 11 June 2021 Open Access

MOEMS-based spectro-imagers for Earth and Universe Observation

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

Proceedings Volume 11852, 118523N (2021) https://doi.org/10.1117/12.2599614

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MOEMS-based instruments could be the next stepping stone in ground-based and space telescopes for Universe and Earth Observation. Targeted instruments are next generation multi-object spectrographs, as MOEMS can be used as reconfigurable slit masks at the MOS entrance, allowing increased instrument compacity and new observational modes such as SNR optimization. For Earth Observation, the use of MOEMS acting like programmable slit masks also allows a dynamic removal of the bright sources in the field of view, therefore enhancing the global SNR of the instrument. We propose a MOEMS-based spectro-imager named BATMAN, using a Digital-Micromirror-Device (DMD) to split the light between its imaging and spectrograph arms. This instrument is intended to be installed at the TNG telescope in the Canary Islands in 2022. This concept has been extended for space Universe and Earth Observation. A new MOEMS-based spectro-imager for Earth Observation has been designed, with constraints of wide 2D field-ofview (3°x1°), image quality (< 2 pixels = 11 μm) and compacity (Fig. 1). The instrument is panchromatic with a medium spectral resolution between 1000 and 2000, fitting in a 80 cm x 80 cm x 40 cm box. A 3-mirror solution for both imaging and spectrograph arms has been designed, using only aspheric surfaces, allowing for easier alignment and tolerancing. The compact design contains a convex grating to disperse light. In order to optimize the spectrograph efficiency, this convex grating must be blazed at the right angle for maximizing the light in the first order of diffraction. For Universe Observation, a new design for a DMD-based high-resolution spectro-imager has been done. For the spectrograph, the large 370 – 950 nm wavelength range is divided into 4 channels for a spectral resolution of 15 000, all with an image quality of under two pixels. Moreover, the 3-mirror design of the instrument allows for a high throughput in comparison to classical systems which use catadioptric optics. These results show the great interest of MOEMS-based spectro-imagers for space Earth and Universe Observation.

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Proceedings Article | 21 August 2020 Presentation + Paper

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, 1148308 (2020) https://doi.org/10.1117/12.2569670

KEYWORDS: Spectrographs, Spectral resolution, Imaging systems, Telescopes, Image quality, Micromirrors, Digital micromirror devices, Spatial resolution

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Proceedings Article | 6 July 2018 Paper

BATMAN @ TNG: instrument integration and performance

Frederic Zamkotsian, Patrick Lanzoni, Nicolas Tchoubaklian, Harald Ramarijaona, Manuele Moschetti, Marco Riva, Marc Jaquet, Paolo Spano, William Bon, Mathieu Vachey, Luciano Nicastro, Emilio Molinari, Rosario Cosentino, Adriano Ghedina, Manuel Gonzalez, Walter Boschin, Paolo Di Marcantonio, Igor Coretti, Roberto Cirami, Filippo Zerbi, Luca Valenziano

Proceedings Volume 10702, 107025P (2018) https://doi.org/10.1117/12.2315222

KEYWORDS: Digital micromirror devices, Mirrors, Micromirrors, Spectroscopes, Spectrographs, Imaging spectroscopy, Telescopes, Cameras, Astronomical instrumentation

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Proceedings Article | 25 September 2017 Open Access

Optical design of Arago’s spectropolarimeter

M. Pertenais, C. Neiner, A. Bouillot, M. Vachey, C. Folsom, A. I. Gomez de Castro

Proceedings Volume 10562, 105622A (2017) https://doi.org/10.1117/12.2296215

KEYWORDS: Stars, Visible radiation, Ultraviolet radiation, Spectrographs, Signal to noise ratio, Optical design, Polarimetry, Sensors, Polarization, Space telescopes

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