Inhomogeneous source uniformization using a shell mixer Köhler integrator

Chaves, Julio and Cvetkovic, Aleksandra and Mohedano, Rubén and Dross, Oliver and Hernández Sanz, Maikel and Benitez Gimenez, Pablo and Miñano Dominguez, Juan Carlos and Vilaplana, J. (2012). Inhomogeneous source uniformization using a shell mixer Köhler integrator. In: "Proceedings of SPIE. Optical Systems Design", 26/11/2012 - 29/11/2012, Barcelona, España. pp. 855021-8550212. https://doi.org/10.1117/12.981004.

Description

Title: Inhomogeneous source uniformization using a shell mixer Köhler integrator
Author/s:
  • Chaves, Julio
  • Cvetkovic, Aleksandra
  • Mohedano, Rubén
  • Dross, Oliver
  • Hernández Sanz, Maikel
  • Benitez Gimenez, Pablo
  • Miñano Dominguez, Juan Carlos
  • Vilaplana, J.
Item Type: Presentation at Congress or Conference (Article)
Event Title: Proceedings of SPIE. Optical Systems Design
Event Dates: 26/11/2012 - 29/11/2012
Event Location: Barcelona, España
Title of Book: Proceedings of SPIE. Optical Systems Design
Date: December 2012
Volume: 8550
Subjects:
Freetext Keywords: Diffusers ; Lenses ; Light sources ; Optical systems ; Optics ; Ray tracing ; Simulations
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

More information

Item ID: 19723
DC Identifier: http://oa.upm.es/19723/
OAI Identifier: oai:oa.upm.es:19723
DOI: 10.1117/12.981004
Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1486635
Deposited by: Memoria Investigacion
Deposited on: 14 Sep 2013 10:21
Last Modified: 21 Apr 2016 20:59
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