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Optical Engineering

Spatial uniformity comparison of two nonimaging concentrators
Author(s): Joseph P. Rice; Yuqin Zong; Daniel Dummer
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Paper Abstract

The spatial uniformity of two nonimaging concentrators is measured, each with a silicon photodetector positioned immediately behind the concentrator. The comparison is made between a compound parabolic concentrator (CPC) and a ?i/?o concentrator. The latter consists of a parabolic section followed by a cone section to restrict the divergence angle of the exit beam. The spatial uniformity of the ?i/?o concentrator measured with an f/4 beam diverging from a circular aperture is 1.2% across the central 4 mm of the entrance aperture of the concentrator, and demonstrates the use of this type of concentrator for effectively maintaining high throughput when using small-area (<2-mmdiam) detectors in applications requiring small fields of view. The uniformity of the gold-coated ?i/?o concentrator measured with a nearly collimated HeNe laser beam is not nearly as good, due in part to the imperfect reflectance of gold. The uniformity of the CPC in the f/4 beam is not nearly as good as that of the ?i/?o concentrator in the f/4 beam.

Paper Details

Date Published: 1 November 1997
PDF: 5 pages
Opt. Eng. 36(11) doi: 10.1117/1.601534
Published in: Optical Engineering Volume 36, Issue 11
Show Author Affiliations
Joseph P. Rice, National Institute of Standards and Technology (United States)
Yuqin Zong, National Institute of Standards & Technology (United States)
Daniel Dummer, NIST (United States)


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