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Active Optics in Astronomy: Freeform Mirror for the MESSIER Telescope Proposal

Laboratoire d’Astrophysique Marseille (LAM), Aix Marseille Université (AMU) and CNRS, 38 rue Frédéric Joliot-Curie, 13388 Marseille CX 13, France
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Math. Comput. Appl. 2019, 24(1), 2;
Received: 28 November 2018 / Revised: 20 December 2018 / Accepted: 20 December 2018 / Published: 27 December 2018
(This article belongs to the Special Issue Related Problems of Continuum Mechanics)
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Active optics techniques in astronomy provide high imaging quality. This paper is dedicated to highly deformable active optics that can generate non-axisymmetric aspheric surfaces—or freeform surfaces—by use of a minimum number of actuators. The aspheric mirror is obtained from a single uniform load that acts over the surface of a closed-form substrate whilst under axial reaction to its elliptical perimeter ring during spherical polishing. MESSIER space proposal is a wide-field low-central-obstruction folded-two-mirror-anastigmat or here called briefly three-mirror-anastigmat (TMA) telescope. The optical design is a folded reflective Schmidt. Basic telescope features are 36 cm aperture, f/2.5, with 1.6° × 2.6° field of view and a curved field detector allowing null distortion aberration for drift-scan observations. The freeform mirror is generated by spherical stress polishing that provides super-polished freeform surfaces after elastic relaxation. Preliminary analysis required use of the optics theory of 3rd-order aberrations and elasticity theory of thin elliptical plates. Final cross-optimizations were carried out with Zemax raytracing code and Nastran FEA elasticity code in order to determine the complete geometry of a glass ceramic Zerodur deformable substrate. View Full-Text
Keywords: telescope; active optics; aspherics; elasticity; optical design; deformable mirror telescope; active optics; aspherics; elasticity; optical design; deformable mirror

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Lemaitre, G.R.; Vola, P.; Muslimov, E. Active Optics in Astronomy: Freeform Mirror for the MESSIER Telescope Proposal. Math. Comput. Appl. 2019, 24, 2.

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