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Proceedings Paper

Irradiance tailoring for extended sources using a point-source freeform design algorithms
Author(s): Rolf Wester; Adrien Bruneton; Axel Bäuerle; Jochen Stollenwerk; Peter Loosen
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Paper Abstract

The advent and rapid development of efficient high power LED sources with their unique emission characteristics enables the development of illumination systems that meet very strict requirements concerning light distribution and efficiency. Most of the algorithms used to design the necessary optical freeform surfaces rely on the point source assumption. As long as the distance between LED and those surfaces is sufficiently large, this is a good approximation. One further important design goal is to make the optical components as small as possible, which makes the point source assumption less accurate. The existing design algorithms thus have to be accompanied by methods to treat the finite-sized LED sources. We examine the limits that are set by the finite size of the light sources and present algorithms to optimize optical freeform surfaces up to these limits. Point source results are iteratively improved to get the desired illumination pattern employing finite sized LEDs. At each iteration step the illumination pattern used in the point source computations is adapted so that the real illumination pattern of an LED approximates the originally desired pattern.

Paper Details

Date Published: 18 December 2012
PDF: 8 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85502S (18 December 2012); doi: 10.1117/12.981755
Show Author Affiliations
Rolf Wester, Fraunhofer-Institut für Lasertechnik (Germany)
Adrien Bruneton, RWTH Aachen (Germany)
Axel Bäuerle, Fraunhofer-Institut für Lasertechnik (Germany)
RWTH Aachen (Germany)
Massachusetts Institute of Technology (United States)
Jochen Stollenwerk, Fraunhofer-Institut für Lasertechnik (Germany)
RWTH Aachen (Germany)
Peter Loosen, Fraunhofer-Institut für Lasertechnik (Germany)
RWTH Aachen (Germany)


Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood; Marta C. de la Fuente; Jean-Luc M. Tissot; Jeffrey M. Raynor; Daniel G. Smith; Frank Wyrowski; Andreas Erdmann; Tina E. Kidger; Stuart David; Pablo Benítez, Editor(s)

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