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Proceedings Paper

Transmission and concentration of solar radiation using a fiber bundle and a DCPC
Author(s): Nuno Pires; Dawei Liang; Julio Chaves; Jose Eugeneo Semedo-Garcao; Luis Fraser Monteiro; Manuel Collares-Pereira
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Paper Abstract

Flexible optical fibers and fiber bundles can be used to transfer concentrated sunlight to a desirable place where it could be used to pump a solid state laser. One flexible fiber bundle was built. It consisted of seven optical fibers. The output section of optical fibers were polished to an hexagonal form. The bundle was placed at the focus of a primary parabolic mirror to capture the solar energy in the core-region of the focal spot. The radiation exiting the fibers was concentrated with a DCPC or with a long conical concentrator. An optical adhesive was utilized to bond the fiber bundle and the concentrator together. For non-contact type concentration, a DCPC was utilized and no index compensating liquid was necessary. A moderate optical flux of 13 W/mm2 was measured, with a large angular divergence as expected together with a non-homogeneous light distribution from the output end of the DCPC concentrator; both were certainly responsible for the unsuccessful attempts at pumping the laser. Hence a long conical concentrator was designed and built. Experimental results shown that both the incident ray acceptance capability and the output light quality are better than the DCPC. A solar flux of about 20 W/mm2 was obtained. Success at pumping the crystal laser can now be expected and will be reported elsewhere.

Paper Details

Date Published: 6 October 1999
PDF: 9 pages
Proc. SPIE 3781, Nonimaging Optics: Maximum Efficiency Light Transfer V, (6 October 1999); doi: 10.1117/12.368249
Show Author Affiliations
Nuno Pires, Univ. Nova de Lisboa (Portugal)
Dawei Liang, Univ. Nova de Lisboa (Portugal)
Julio Chaves, Univ. Tecnica de Lisboa (Portugal)
Jose Eugeneo Semedo-Garcao, Univ. Nova de Lisboa (Portugal)
Luis Fraser Monteiro, Univ. Nova de Lisboa (Portugal)
Manuel Collares-Pereira, Univ. Tecnica de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 3781:
Nonimaging Optics: Maximum Efficiency Light Transfer V
Roland Winston, Editor(s)

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