Optical design of a multi-resolution, single shot spectrograph François Hénault Institut de Planétologie et d’Astrophysique de Grenoble, Université Grenoble-Alpes, CNRS, B.P. 53, 38041 Grenoble – France Florence Laurent Centre de Recherche Astrophysique de Lyon - Observatoire de Lyon, 9, Avenue Charles André, 69230 Saint-Genis-Laval – France Y”
120 m m
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3 x 35 mm
Field lenses array 2
Pupil slicing Type 1 A
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- We present the principle of a single shot multiple resolution spectrograph enabling to freeze the effects of atmospheric perturbations and including no grating mechanism - The concept is making use of a new way of realizing pupil slicing. There are two main subsystems: pupil slicer and spectrograph - We worked out an example of optical design inspired by a real-world spectrograph (from the 4MOST instrument) - This is a very demanding optical system carrying an enormous optical etendue (entrance slit of 160 mm, image F# of 1.75, 6K x 6K detector array) - Nevertheless, an extrapolated multi-resolution spectrograph achieves satisfactory image quality performance (PSF ≈ 2 pixels) - This pupil slicing concept could be adapted to other types of instrument
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