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Proceedings Paper

Investigation of TMA systems with different freeform surfaces
Author(s): Y. Zhong; H. Gross; A. Broemel; S. Kirschstein; P. Petruck; A. Tuennermann
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Paper Abstract

Three mirror anastigmats (TMA) are telescopic optical systems with only plane symmetry, that allow for good image quality without any central obscuration. The complexities of manufacturing and alignment can be reduced by fabricating the first mirror and the third mirror in one piece and defining a common axis of all the mirrors. It is attractive to use off-axis used aspheres and to come to an acceptable performance with the smallest number of freeform surfaces. In this paper, different types of freeform surfaces are considered to evaluate their potential. In the performed case study, the correction of spherical aberration and coma is best corrected in the pupil with the second mirror and to select the Zernike representation with remaining x-symmetry is one of the best ways to do this. The use of the Chebyshev polynomials also gives good results. Furthermore it is found, that the first mirror and the third mirror are quite beneficial to be modelled as off-axis aspheres of the Q-type. The result shows that a combination of two Q-aspheres with a Zernike surface at the second mirror is one of the most favorable combinations.

Paper Details

Date Published: 23 September 2015
PDF: 10 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96260X (23 September 2015); doi: 10.1117/12.2191228
Show Author Affiliations
Y. Zhong, Friedrich-Schiller-Univ. Jena (Germany)
H. Gross, Friedrich-Schiller-Univ. Jena (Germany)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
A. Broemel, Friedrich-Schiller-Univ. Jena (Germany)
S. Kirschstein, Jena-Optronik GmbH (Germany)
P. Petruck, Jena-Optronik GmbH (Germany)
A. Tuennermann, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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