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Proceedings Paper

Experimental measurements of RXI concentrators
Author(s): Juan-Carlos Gonzalez; Pablo Benitez; Juan Carlos Minano; Jose L. Alvarez; M. Rosario Ochoa
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Paper Abstract

A small series of nonimaging RXI concentrators designed for concentrating radiation on a 1 mm2 photodiode have been manufactured by injection molding of PMMA (polymethyl methacrylate). Their entry aperture diameter is 40 mm and the design acceptance angle is +/- 2.24 degrees. Measurements done at (lambda) equals 890 nm show an optical efficiency of 33.8% and the relative transmission drops from 90% to 10% when the incidence angle varies from 1.2 to 3.4 degrees. A computer model of the concentrator which takes into account the different optical losses shows that optical efficiency is increased up to 57.1 % using silver metallization and (lambda) equals 800 nm. Moreover if photodiode position error is corrected, then the efficiency grows up to 76.2%, and if profile errors are also corrected, then the efficiency reach 88.2%. A more stepped angular transmission requires a most accurate manufacture process.

Paper Details

Date Published: 21 August 1995
PDF: 11 pages
Proc. SPIE 2538, Nonimaging Optics: Maximum Efficiency Light Transfer III, (21 August 1995); doi: 10.1117/12.216991
Show Author Affiliations
Juan-Carlos Gonzalez, Univ. Politecnica de Madrid (Spain)
Pablo Benitez, Univ. Politecnica de Madrid (Spain)
Juan Carlos Minano, Univ. Politecnica de Madrid (Spain)
Jose L. Alvarez, Univ. Politecnica de Madrid (Spain)
M. Rosario Ochoa, Univ. Politecnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 2538:
Nonimaging Optics: Maximum Efficiency Light Transfer III
Roland Winston, Editor(s)

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