Exploration of a 14-meter, 1.5-degree field of view, quad-mirror anastigmatic telescope concept for wide-field spectroscopy and imaging

Samuel C. Barden; Marc R. Baril; Damien Jones

doi:10.1117/12.2630421

29 August 2022 Exploration of a 14-meter, 1.5-degree field of view, quad-mirror anastigmatic telescope concept for wide-field spectroscopy and imaging

Samuel C. Barden, Marc R. Baril, Damien Jones

Author Affiliations +

Proceedings Volume 12182, Ground-based and Airborne Telescopes IX; 121822I (2022) https://doi.org/10.1117/12.2630421
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Three mirror anastigmatic telescope designs offer excellent imaging performance in a compact optical structure. The introduction of a fourth, fold mirror allows straightforward access to the image surface of the telescope at a Nasmyth position where instrumentation can be located and easily exchanged. The design presented here is of a 14-meter diameter primary providing a 1.5 square degree field of view with an f/4 focus to a pupil-centric image surface. Two fused silica lenses serve as an atmospheric dispersion compensator, a third field lens forms a large radius pupil-centric image. The optical design gives polychromatic (360-1800 nm) encircled energy diameters (EED) of greater than 80% within 0.25 arc-second diameters across the full field at Zenith. Excellent monochromatic image performance extends through and redward of the K-band (2320 nm). The flat fold mirror, located at a pupil, could be upgraded to an adaptive mirror for image correction and/or GLAO. Image performance is given. We believe that this design offers a very powerful, versatile, and scientifically viable facility suitable for the next generation of ground-based facilities for fiber spectroscopy (~18,000 probes), multi-slit spectroscopy, IFU spectroscopy, and imaging.

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Samuel C. Barden, Marc R. Baril, and Damien Jones "Exploration of a 14-meter, 1.5-degree field of view, quad-mirror anastigmatic telescope concept for wide-field spectroscopy and imaging", Proc. SPIE 12182, Ground-based and Airborne Telescopes IX, 121822I (29 August 2022); https://doi.org/10.1117/12.2630421

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