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Fabrication of Pupil Masks for a New Infrared Exoplanet Imager at Keck Observatory

The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES) is an instrument being designed to perform direct imaging of exoplanets in the mid-infrared (2-5 μm) with the Adaptive Optics System of W.M. Keck Observatory. To eliminate unwanted thermal infrared radiation, SCALES utilizes both a cold stop for excluding background radiation and a vector vortex coronagraph with Lyot stops for starlight suppression. Optimal geometric masks have been designed. We simulate the propagation of light through the Lyot plane and analyze the on-axis images of stars in the K, L, and M band for the performance of the Lyot stops. Additionally, finalized cold stop and Lyot stop designs are presented along with evaluations on the effects of manufacturing tolerances and tilt in pupil planes caused by off-axis parabolic mirror relays.

preprint2022arXivOpen access
Jialin LiAndrew J. SkemerMaaike A. M. van KootenRenate KupkeNicholas MacDonald
astro-ph.IM
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Jialin LiAndrew J. SkemerMaaike A. M. van KootenRenate KupkeNicholas MacDonald

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