A centred three mirror anastigmat

Mario Gai; Alberto Riva; Deborah Busonero; Alberto Vecchiato; Federico Landini

doi:10.1117/12.3018966

23 August 2024 A centred three mirror anastigmat

Mario Gai, Alberto Riva, Deborah Busonero, Alberto Vecchiato, Federico Landini

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309234 (2024) https://doi.org/10.1117/12.3018966
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The CEntral (field) Three-mirror Anastigmat (CETA) telescope is designed on the specifications of the proposed Theia mission, aiming at high precision differential astrometry over a large field, for exo-planetary system characterization and dark matter /dark energy search through the dynamics of star clusters. Usually, Three Mirror Anastigmat designs are either off-axis in terms of field, or decentered in terms of pupil. We propose a family of solutions using fully centred optics and a large on-axis field, at the expense of a non negligible central obscuration. We analyse in particular a 1 m class compact telescope, with 15 m effective focal length, i.e. suited to small pixel (4-6 $micro$m) CMOS detectors operating in the visible and near IR. Due to the underlying symmetry, the resulting optical response is quite good over a 14 arcmin radius field, and it is of special interest to astrometry applications. Also, manufacturing, alignment and calibration can be expected to benefit significantly; some basic aspects are preliminarily considered.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Mario Gai, Alberto Riva, Deborah Busonero, Alberto Vecchiato, and Federico Landini "A centred three mirror anastigmat", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309234 (23 August 2024); https://doi.org/10.1117/12.3018966

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