Compact illumination optic with three freeform surfaces for improved beam control

Multi-chip and large size LEDs dominate the lighting market in developed countries these days. Nevertheless, a general optical design method to create prescribed intensity patterns for this type of extended sources does not exist. We present a design strategy in which the source and the target patte...

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Bibliographic Details
Published in:Optics express 2017-11, Vol.25 (24), p.29627-29641
Main Authors: Sorgato, Simone, Mohedano, Rubén, Chaves, Julio, Hernández, Maikel, Blen, José, Grabovičkić, Dejan, Benítez, Pablo, Miñano, Juan Carlos, Thienpont, Hugo, Duerr, Fabian
Format: Article
Language:English
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Summary:Multi-chip and large size LEDs dominate the lighting market in developed countries these days. Nevertheless, a general optical design method to create prescribed intensity patterns for this type of extended sources does not exist. We present a design strategy in which the source and the target pattern are described by means of "edge wavefronts" of the system. The goal is then finding an optic coupling these wavefronts, which in the current work is a monolithic part comprising up to three freeform surfaces calculated with the simultaneous multiple surface (SMS) method. The resulting optic fully controls, for the first time, three freeform wavefronts, one more than previous SMS designs. Simulations with extended LEDs demonstrate improved intensity tailoring capabilities, confirming the effectiveness of our method and suggesting that enhanced performance features can be achieved by controlling additional wavefronts.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.029627