Novel aplanatic designs for LED concentration

Melissa Ricketts; Roland Winston; Lun Jiang

doi:10.1117/12.2065247

9 September 2014 Novel aplanatic designs for LED concentration

Melissa Ricketts, Roland Winston, Lun Jiang

Proceedings Volume 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI; 91910C (2014) https://doi.org/10.1117/12.2065247
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

Citation Download Citation

Melissa Ricketts, Roland Winston, and Lun Jiang "Novel aplanatic designs for LED concentration", Proc. SPIE 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI, 91910C (9 September 2014); https://doi.org/10.1117/12.2065247

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