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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S3 — May. 5, 2014
  • pp: A742–A758

Planar waveguide LED illuminator with controlled directionality and divergence

William M. Mellette, Glenn M. Schuster, and Joseph E. Ford  »View Author Affiliations

Optics Express, Vol. 22, Issue S3, pp. A742-A758 (2014)

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We present a versatile illumination system where white light emitting diodes are coupled through a planar waveguide to periodically patterned extraction features at the focal plane of a two dimensional lenslet array. Adjusting the position of the lenslet array allows control over both the directionality and divergence of the emitted beam. We describe an analytic design process, and show optimal designs can achieve high luminous emittance (1.3x104 lux) over a 2x2 foot aperture with over 75% optical efficiency while simultaneously allowing beam steering over ± 60° and divergence control from ± 5° to fully hemispherical output. Finally, we present experimental results of a prototype system which validate the design model.

© 2014 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(230.7400) Optical devices : Waveguides, slab
(080.2175) Geometric optics : Etendue
(110.2945) Imaging systems : Illumination design
(080.4295) Geometric optics : Nonimaging optical systems

ToC Category:
Illumination Design

Original Manuscript: December 19, 2013
Revised Manuscript: February 27, 2014
Manuscript Accepted: March 15, 2014
Published: April 1, 2014

William M. Mellette, Glenn M. Schuster, and Joseph E. Ford, "Planar waveguide LED illuminator with controlled directionality and divergence," Opt. Express 22, A742-A758 (2014)

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