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Proceedings Paper

Free-forms optics into astronomical use: the case of an all-mirror anamorphic collimator
Author(s): Paolo Spanò
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Paper Abstract

Up to now, optical design of astronomical instrumentation has been based onto "classical" surfaces, i.e. plano surfaces, spherical surfaces, and some classes of aspheric surfaces. More complex surfaces (like cylinders), are used from time to time to correct for aberrations. A new class of more general surfaces, i.e. non-rotationally symmetrical and completely "free-form" surfaces have been recently introduced. Their use in astronomy, however, has not widely used so far. We propose a new layout for an anamorphic collimator based onto two "free-form" cylinder surfaces, giving diffraction limited images. This collimator can be used to create an elliptical pupil, and allows reducing size of optical systems, too. Two interesting cases of application in astronomy are shown: a very-high resolution spectrograph for large telescopes, and an interferometer cavity to test large plano optics.

Paper Details

Date Published: 23 July 2008
PDF: 7 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701840 (23 July 2008); doi: 10.1117/12.789183
Show Author Affiliations
Paolo Spanò, INAF-Osservatorio Astronomico di Brera (Italy)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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