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Optical Engineering

Process for designing a freeform Fresnel lens
Author(s): Peter I. 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: 1 December 2011
PDF: 8 pages
Opt. Eng. 50(12) 121703 doi: 10.1117/1.3617474
Published in: Optical Engineering Volume 50, Issue 12
Show Author Affiliations
Peter I. Goldstein, Philips Solid-State Lighting Solutions (United States)

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