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Proceedings Paper

Freeform optics complexity estimation: comparison of methods
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Paper Abstract

In the present paper we compare different approaches for estimation of freeform and aspherical surfaces complexity. We consider two unobscured all-reflective telescope designs: a narrow-field Korsch-type system with a slow freeform secaondary and a wide-field Schwarzschild-type system with an extreme freeform secondary. The performance improvement obtained due to the freeforms use is demonstrated. The Korsch telescope provides a diffraction-limited image quality for a small field 0.8x0.1° at F/3. The Schwarzschild design covers a large field of 20x8° and allows to increase the aperture from F/6.7 to F/3. Also, we analyze the freeforms shapes using different techniques. It is shown that the usual measures like root-mean square deviation of the sag are ineffective. One of the recommended way to estimate the surface complexity is computation of the residual slope and its conversion into fringes frequency. A simpler alternative is computation of the sag deviation integral.

Paper Details

Date Published: 24 May 2018
PDF: 9 pages
Proc. SPIE 10679, Optics, Photonics, and Digital Technologies for Imaging Applications V, 106791M (24 May 2018); doi: 10.1117/12.2306671
Show Author Affiliations
Eduard Muslimov, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Kazan National Research Technical Univ. named after A.N. Tupolev (Russian Federation)
Emmanuel Hugot, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Simona Lombardo, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Melanie Roulet, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Marc Ferrari, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)


Published in SPIE Proceedings Vol. 10679:
Optics, Photonics, and Digital Technologies for Imaging Applications V
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal, Editor(s)

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