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Proceedings Paper

Inhomogeneous source uniformization using a shell mixer Köhler integrator
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Paper Abstract

High flux and high CRI may be achieved by combining different chips and/or phosphors. This, however, results in inhomogeneous sources that, when combined with collimating optics, typically produce patterns with undesired artifacts. These may be a combination of spatial, angular or color non-uniformities. In order to avoid these effects, there is a need to mix the light source, both spatially and angularly. Diffusers can achieve this effect, but they also increase the etendue (and reduce the brightness) of the resulting source, leading to optical systems of increased size and wider emission angles. The shell mixer is an optic comprised of many lenses on a shell covering the source. These lenses perform Kohler integration to mix the emitted light, both spatially and angularly. Placing it on top of a multi-chip Lambertian light source, the result is a highly homogeneous virtual source (i.e, spatially and angularly mixed), also Lambertian, which is located in the same position with essentially the same size (so the average brightness is not increased). This virtual light source can then be collimated using another optic, resulting in a homogeneous pattern without color separation. Experimental measurements have shown optical efficiency of the shell of 94%, and highly homogeneous angular intensity distribution of collimated beams, in good agreement with the ray-tracing simulations.

Paper Details

Date Published: 18 December 2012
PDF: 12 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85502X (18 December 2012); doi: 10.1117/12.981004
Show Author Affiliations
J. Chaves, Light Prescriptions Innovators Europe, S. L. (Spain)
A. Cvetkovic, Light Prescriptions Innovators Europe, S. L. (Spain)
R. Mohedano, Light Prescriptions Innovators Europe, S. L. (Spain)
O. Dross, Philips Research (Netherlands)
M. Hernandez, Light Prescriptions Innovators Europe, S. L. (Spain)
P. Benítez, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
J. Miñano, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
J. Vilaplana, Light Prescriptions Innovators Europe, S. L. (Spain)


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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