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Proceedings Paper

Process for designing a freeform Fresnel lens
Author(s): Peter Goldstein
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Paper Abstract

This paper describes a process for designing a faceted freeform Fresnel lens. Where a traditional Fresnel lens uses a profile revolved around a central axis, a freeform Fresnel lens uses individual triangular or trapezoidal facets that comprise a freeform surface. This type of lens combines the capability of a freeform surface with the benefits of a Fresnel lens, in particular: thin profile, low cost, small size, and relatively simple geometry calculations. An algorithm is presented to design such a lens that generates an output intensity distribution without depending on symmetry in the light source, the lens aperture, or the output intensity distribution. Two example systems are presented, demonstrating how a freeform Fresnel lens can reshape a beam of light without relying on symmetry.

Paper Details

Date Published: 26 August 2010
PDF: 11 pages
Proc. SPIE 7787, Novel Optical Systems Design and Optimization XIII, 778705 (26 August 2010); doi: 10.1117/12.858400
Show Author Affiliations
Peter Goldstein, Philips Color Kinetics (United States)

Published in SPIE Proceedings Vol. 7787:
Novel Optical Systems Design and Optimization XIII
G. Groot Gregory; R. John Koshel, Editor(s)

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