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"Design of axisymmetrical tailored concentrators for LED light source applications," Photonics Europe 2006
Article Type: White Papers
Updated: Oct 17, 2006
Author(s): Bart Van Giel, Youri Meuret, Hugo Thienpont
Abstract
"...we present a solution to an important question in the design of a LED-based illumination engine for projection systems: the collimation of the LED light. We tested the principle in the modification of a common device in non-imaging optics, the compound Parabolic Concentrator. This CPC-like achieves a collection of 72% (ideal reflective coating presumed). This CPC-like was tailored by numerically solving an differential equation. This approach has some serious drawbacks. For a compact collection device with high collimation, an other approach is required. A more elegant design strategy will rely fully on geometrical principles. The result of our work is a compound collection lens that achieves a collection efficiency of 87%, assuming an ideal reflective coating and neglecting Fresnel losses..."
Keywords: light-emitting diode, projection display, edge ray theorem, etendue, collimation, illumination, optimization, optical design, tailored surfaces, MATLAB
Copyright 2006, Society of Photo-Optical Instrumentation Engineers. This paper is made available with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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