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Proceedings Paper

Novel aplanatic designs for LED concentration
Author(s): Melissa Ricketts; Roland Winston; Lun Jiang
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Paper Abstract

Aplanats make great concentrators because of their near perfect imaging. Aplanatic conditions can be satisfied using two surface curves (generally mirrored surfaces) in two dimensions (see Figure 1) which are constructed by successive approximation to create a highly efficient concentrator for both concentration and illumination. For concentration purposes, having a two mirror system would be impossible because the front mirror would block incoming light (see figure 2) so the idea is to replace the front mirror with a "one-way" mirror. Light from a lower index can be transmitted, so if the aplanat surface is a higher index light is allowed to enter, and be trapped. In the Jellyfish design, TIR takes place except for light striking the surface within the range of critical angles. To combat that, a small area of reflective coating is applied to the central top part of the Jellyfish, where TIR fails (In the middle) to keep the light there from directly escaping (see figure 3). The design works in both forwards and reverse. Light entering can be focused to a collecter, or the collecter can be replaced with a light source to concentrate light out. In this case, LEDs are used for their highly efficienct properties.

Paper Details

Date Published: 9 September 2014
PDF: 7 pages
Proc. SPIE 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI, 91910C (9 September 2014); doi: 10.1117/12.2065247
Show Author Affiliations
Melissa Ricketts, Univ. of California, Merced (United States)
Roland Winston, Univ. of California, Merced (United States)
Lun Jiang, Univ. of California, Merced (United States)

Published in SPIE Proceedings Vol. 9191:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI
Roland Winston; Jeffrey M. Gordon, Editor(s)

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