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Proceedings Paper

Characterization of lightpipes for efficient transfer of light
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Paper Abstract

Lightpipes are used to transfer light from the source to a desired target. The lightpipe shape typically conforms to the necessary path, thus bending of the lightpipe is required. A number of different methods of bending the lightpipe have been developed, from linear, discontinuous bends to smooth, common circular bends to bends that expand or contract the cross-sectional size of the lightpipe over the path. In this paper we develop a set of parameters to describe the overall shape of an in-plane lightpipe section. These parameters include the thickness, radius of bend, index of refraction, and ratios of sets of these parameters. The transfer efficiency from the source to target is used to quantify the utility of parameterized lightpipes. Etendue is used to highlight the results. More complex lightpipes, such as those with several bends along their path, can be developed from the combination of parameterized sections. Finally, this parameterization can be used to automate the development of lightpipe geometry within optical analysis and design software.

Paper Details

Date Published: 8 September 2005
PDF: 12 pages
Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 594205 (8 September 2005); doi: 10.1117/12.619894
Show Author Affiliations
R. John Koshel, Lambda Research Corp. (United States)
Optical Sciences Ctr./The Univ. of Arizona (United States)
Anurag Gupta, Hewlett Packard Co. (United States)

Published in SPIE Proceedings Vol. 5942:
Nonimaging Optics and Efficient Illumination Systems II
Roland Winston; R. John Koshel, Editor(s)

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