3 August 2006 Geodesic lens: new designs for illumination engineering
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Proceedings Volume 6342, International Optical Design Conference 2006; 634214 (2006) https://doi.org/10.1117/12.692271
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada
Abstract
A novel waveguide-optical integrator is introduced for applications to LEDs. The concept is based upon a Kohler illuminator made of Luneburg lenses. Typical Kohler illuminators are formed by pairs of thin lenses, and perform badly when the paraxial approximation is rough, i.e., when the angular span of the incoming rays is wide. In contrast, the new illuminator performs ideally for angular spans up to 90° (±45°), and has only a 3% loss for a 180° angular span. In general such an illuminator cannot be made in 3D, because adjacent Luneburg lenses overlap. It can, however, be implemented in planar optics, by using Rinehart geodesic lenses. This waveguide device has application in illumination engineering as a light mixer, particularly for LEDs. Another light mixer using a combination of two kaleidoscopes with a geodesic lens is also presented. Irradiance at the exit of a kaleidoscope has good light mixing if the kaleidoscope is long enough, but the intensity is never well mixed, irrespective of the length. Inserting a Rinehart geodesic lens produces a 90-degree phase-space rotation of the rays, i.e., it exchanges irradiance and intensity. An further kaleidoscope assures complete mixing in both irradiance and intensity.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juan C. Miñano, Juan C. Miñano, Pablo Benítez, Pablo Benítez, Bill Parkyn, Bill Parkyn, Dejan Grabovickic, Dejan Grabovickic, Fernando García, Fernando García, Asunción Santamaría, Asunción Santamaría, José Blen, José Blen, Julio Chaves, Julio Chaves, Waqidi Falicoff, Waqidi Falicoff, } "Geodesic lens: new designs for illumination engineering", Proc. SPIE 6342, International Optical Design Conference 2006, 634214 (3 August 2006); doi: 10.1117/12.692271; https://doi.org/10.1117/12.692271
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