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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 12 — Apr. 20, 2006
  • pp: 2572–2575

Carambola optics for recycling of light

Ralf Leutz, Ling Fu, and Harald Ries  »View Author Affiliations

Applied Optics, Vol. 45, Issue 12, pp. 2572-2575 (2006)

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Recycling of light allows the luminance (radiance) emitted by a light source to be increased at the cost of reducing the total luminous flux (radiant power). Recycling of light means returning part of the emitted light to the source, where part of it will escape absorption. An optical design that is suitable for multiple and controlled recycling is described. Carambola optics is named for its resemblance to star fruit. Several pairs of mirrors or prisms redirect light repeatedly onto the source, thus achieving multiple transits of the light through the source. This recycled light exits the carambola in the same phase space as light directly emitted and not recycled.

© 2006 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(080.2740) Geometric optics : Geometric optical design
(220.4830) Optical design and fabrication : Systems design

Original Manuscript: October 18, 2005
Manuscript Accepted: November 16, 2006

Ralf Leutz, Ling Fu, and Harald Ries, "Carambola optics for recycling of light," Appl. Opt. 45, 2572-2575 (2006)

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  1. L. Fu, R. Leutz, and H. Ries, "Light recycling in solid state devices," in Fifth International Conference on Solid State Lighting,Proc. SPIE 5941, doi: ( 2005). [CrossRef]
  2. L. Fu, R. Leutz, and H. Ries, " Spectroscopic measurement of radiation of high-pressure mercury discharge lamps," J. Appl. Phys. 97, 123302 ( 2005). [CrossRef]
  3. K. K. Li, " Illumination engine for a projection display using a tapered light pipe," U.S. patent 6,739,726 B2 (25 May 2004).
  4. K. K. Li, S. Sillyman, and S. Inatsugu, " Optimization of dual paraboloidal reflector and polarization system for displays using a ray-tracing model," Opt. Eng. 43, 1545- 1551 ( 2004). [CrossRef]
  5. H. Ries and W. Spirkl, " A generalized Kirchhoff law for quantum absorption and luminescence," Solar Energy Mater. Solar Cells 38, 39- 44 ( 1995). [CrossRef]
  6. S. M. Zimmerman, K. W. Beeson, and H. Zou, " Illumination system with light recycling to enhance brightness," U.S. patent 6,144,536 (7 November 2000).

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