Title

Optimization of freeform lightpipes for light-emitting-diode projectors

Authors

Authors

F. Fournier;J. Rolland

Comments

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Abbreviated Journal Title

Appl. Optics

Keywords

Optics

Abstract

Standard nonimaging components used to collect and integrate light in light-emitting-diode-based projector light engines such as tapered rods and compound parabolic concentrators are compared to optimized freeform shapes in terms of transmission efficiency and spatial uniformity. We show that the simultaneous optimization of the output surface and the profile shape yields transmission efficiency within the etendue limit up to 90% and spatial uniformity higher than 95%, even for compact sizes. The optimization process involves a manual study of the trends for different shapes and the use of an optimization algorithm to further improve the performance of the freeform lightpipe. (C) 2008 Optical Society of America.

Journal Title

Applied Optics

Volume

47

Issue/Number

7

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

957

Last Page

966

WOS Identifier

WOS:000254674000012

ISSN

1559-128X

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