Process for designing a freeform Fresnel lens

Peter I. Goldstein

doi:10.1117/1.3617474

1 December 2011 Process for designing a freeform Fresnel lens

Peter I. Goldstein

Author Affiliations +

Optical Engineering, Vol. 50, Issue 12, 121703 (December 2011). https://doi.org/10.1117/1.3617474

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.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Peter I. Goldstein "Process for designing a freeform Fresnel lens," Optical Engineering 50(12), 121703 (1 December 2011). https://doi.org/10.1117/1.3617474

Published: 1 December 2011

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