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Optical Engineering

Incoupling and outcoupling of light from a luminescent rod using a compound parabolic concentrator
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Paper Abstract

Secondary optics that allow for the integration of a light-emitting diode (LED)-based luminescent light source into various étendue-limited applications—such as projection systems—are investigated. Using both simulations and experiments, we have shown that the optical efficacy of the luminescent light source can be increased using a collimator. A thorough analysis of the influence of the collimator’s refractive index on the optical outcoupling and luminance is investigated and it is shown that it is most optimal to use a refractive index of 1.5. The optimal shape of the collimator is equal to that of a compound parabolic concentrator. Experimental results show that by using a collimator, we can improve the amount of outcoupled light with a factor of 1.8 up to 2.1 depending on the used optical configuration of the LED-based luminescent light source.

Paper Details

Date Published: 12 May 2015
PDF: 6 pages
Opt. Eng. 54(5) 055101 doi: 10.1117/1.OE.54.5.055101
Published in: Optical Engineering Volume 54, Issue 5
Show Author Affiliations
Stijn Roelandt, Vrije Univ. Brussel (Belgium)
Youri Meuret, KU Leuven (Belgium)
Dick K. G. de Boer, Philips Research (Netherlands)
Dominique Bruls, Royal Philips N.V. (Netherlands)
Patrick Van De Voorde, Philips Lighting N.V. (Belgium)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)

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