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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 13 — May. 1, 1997
  • pp: 2869–2874

Extracting concentrated guided light

Harald Ries, Akiba Segal, and Jacob Karni  »View Author Affiliations


Applied Optics, Vol. 36, Issue 13, pp. 2869-2874 (1997)
http://dx.doi.org/10.1364/AO.36.002869


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Abstract

The maximum concentration of radiation is proportional to the square of the refractive index of the medium in which it propagates. A medium with a high refractive index can also serve as a lightguide for concentrated radiation. However, if concentrated radiation is extracted from one medium, with a high refractive index, to another, whose index is lower (e.g., from fused silica into air), part of the radiation may be lost because of the total internal reflection at the interface. We present polygonal shapes suitable for efficient extraction of the concentrated radiation in a controllable way, without increasing the cross-section area (or diameter) of the lightguide. It is shown analytically and experimentally that the use of a secondary concentrator, followed by such a light extractor, both having a high refractive index, can provide considerably more power to a solar receiver with a specific aperture.

© 1997 Optical Society of America

Citation
Harald Ries, Akiba Segal, and Jacob Karni, "Extracting concentrated guided light," Appl. Opt. 36, 2869-2874 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-13-2869


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References

  1. W. T. Welford and R Winston, High Collection Non-Imaging Optics (Academic, New York, 1989).
  2. J. Karni, H. Ries, A. Segal, V. Krupkin, and A. Yogev, “Delivery of radiation from a transparent medium,” International patent application PCT/US95/04915, Publication WO95/29415 (1995).
  3. H. Ries, W. Spirkl, and R. Winston, “Cone and trumpet concentrators in the light of the general edge-ray theorem,” in Nonimaging Optics: Maximum Efficiency Light Transfer III R. Winston, eds., Proc. SPIE 2538, 10–15 (1995).
  4. H. Ries and A. Rabl, “The edge ray principle of nonimaging optics,” J. Opt. Soc. Am. A 11, 2627–2632 (1994). Also included in R. Winston, ed., Selected Papers in Nonimaging Optics, SPIE Milestone Series Vol. MS 106 (SPIE Optical Engineering Press, Bellingham, Mass., 1995).
  5. J Karni, A. Kribus, P. Doron, A. Fiterman, and D. Sagie, “The DIAPR; A high-pressure, high-temperature solar receiver,” ASME J. Sol. Energy Eng. 119 (February 1997).
  6. D. Jenkins, R. Winston, J. Bliss, J. O’Gallagher, A. Lewandowski, and C. Bingham, “Solar concentration of 50,000 achieved with output power approaching 1 kW,” ASME J. Sol. Energ. Eng. 118, 141–145 (1996).

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