Secondary optics that allow for the integration of a light-emitting diode (LED)-based luminescent light source into various etendue-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. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Original languageEnglish
Article number055101
Number of pages5
JournalOpt Eng
Issue number5
Publication statusPublished - May 2015

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