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Imaging Biological Samples with Optical Microscopy

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Related Experiment Video

Updated: Jul 7, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Extracting concentrated guided light.

H Ries, A Segal, J Karni

    Applied Optics
    |May 1, 1997
    PubMed
    Summary

    High refractive index materials can guide concentrated radiation, but extraction can cause losses. Novel polygonal shapes efficiently extract radiation, enhancing solar receiver power delivery without increasing lightguide size.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Renewable Energy

    Background:

    • Maximum radiation concentration is proportional to the square of a medium's refractive index.
    • High refractive index media act as efficient lightguides for concentrated radiation.
    • Extracting radiation from high to low refractive index media can cause significant losses due to total internal reflection.

    Purpose of the Study:

    • To present novel polygonal shapes for efficient, controllable extraction of concentrated radiation.
    • To enable radiation extraction without increasing the lightguide's cross-sectional area.
    • To improve power delivery to solar receivers using secondary concentrators and specialized light extractors.

    Main Methods:

    • Analytical modeling of radiation extraction using polygonal shapes.

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  • Experimental validation of the proposed light extractor designs.
  • Integration with secondary concentrators for enhanced solar energy collection.

    • Main Results:

    • Polygonal shapes facilitate efficient and controllable extraction of concentrated radiation.
    • The proposed extraction method avoids increasing the lightguide's diameter.
    • A system with a secondary concentrator and high refractive index extractor significantly increases power delivered to a solar receiver.

    Conclusions:

    • Novel polygonal light extractors overcome total internal reflection losses during radiation extraction.
    • This technology enhances the efficiency of concentrated solar power systems.
    • The method provides a means to increase solar receiver power without altering lightguide dimensions.