Open AccessDesign of efficient LED optics with two free-form surfaces
Author(s) -
Mikhail A. Moiseev,
Sergey V. Kravchenko,
Leonid L. Doskolovich
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.0a1926
Subject(s) - optics , nonimaging optics , geometrical optics , physical optics , free form , computer science , optical engineering , ray tracing (physics) , process (computing) , stray light , physics , computer graphics (images) , operating system
Most LED illumination applications require generation of complex light patterns for which the secondary optics with two free-form surfaces needs to be used. We present a novel optimization method for computing such type of optical elements. An analytical solution for the generation of the initial surfaces is proposed. To accelerate the optimization process, a specific surface representation is used, that eliminates the need to run a time-expensive raytracing procedure. As an example, an optical element generating uniformly illuminated rectangular area with size of 60° by 40° is computed. Lighting efficacy for the extended Lambertian source 1x1 mm is 88.5% and nonuniformity is less than 8.5%.