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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 12 — Apr. 20, 2006
  • pp: 2623–2630

White LED light coupling into light guides with diffraction gratings

Samuli Siitonen, Pasi Laakkonen, Pasi Vahimaa, Markku Kuittinen, and Noora Tossavainen  »View Author Affiliations


Applied Optics, Vol. 45, Issue 12, pp. 2623-2630 (2006)
http://dx.doi.org/10.1364/AO.45.002623


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Abstract

Radial diffractive gratings are used to couple light of a white LED into a light guide. Theoretical coupling efficiencies are evaluated with rigorous diffraction theory in a pure conical mounting. It is shown that when the refractive index of the grating increases from 1.46 to 2.05 the incoupling efficiency increases from 42 %   to   63 % . Also, with the increasing refractive index the incoupling efficiency is shown to become more nearly uniform over the visible spectrum. Experimental results for the incoupled efficiencies and the color coordinates of the incoupled spectra are introduced for refractive indices n = 1.46 and n = 1.56 .

© 2006 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(230.0230) Optical devices : Optical devices
(230.1950) Optical devices : Diffraction gratings
(230.7400) Optical devices : Waveguides, slab

History
Original Manuscript: July 6, 2005
Revised Manuscript: November 18, 2005
Manuscript Accepted: November 23, 2005

Citation
Samuli Siitonen, Pasi Laakkonen, Pasi Vahimaa, Markku Kuittinen, and Noora Tossavainen, "White LED light coupling into light guides with diffraction gratings," Appl. Opt. 45, 2623-2630 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-12-2623

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