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High-irradiance reactors with unfolded aplanatic optics.

Daniel Feuermann1, Jeffrey M Gordon

  • 1Department of Solar Energy and Environmental Physics, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel.

Applied Optics
|January 6, 2009
PubMed
Summary

Designing high-temperature chemical reactors requires efficient light concentration from short-arc lamps. This study presents novel unfolded aplanat optics, like the double-ellipsoid mirror, to achieve high irradiance and efficiency at a remote target.

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Area of Science:

  • Optical Engineering
  • Chemical Reactor Design

Background:

  • Concentrating intense irradiance from short-arc discharge lamps to a remote target with high radiative efficiency is crucial for high-temperature chemical reactors.
  • Achieving a high numerical aperture at both the target and the source presents significant design challenges.

Purpose of the Study:

  • To explore near-field unfolded aplanats as a feasible solution for reconstituting intense lamp irradiance at a remote target.
  • To propose advanced compound unfolded aplanats for comprehensive lamp emission collection and reactor irradiation.

Main Methods:

  • Investigated near-field unfolded aplanats, specifically a double-ellipsoid mirror prototype.
  • Designed and analyzed compound unfolded aplanats capable of collecting emission over all angles.

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Last Updated: Jun 26, 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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Main Results:

  • A prototype double-ellipsoid mirror was constructed and its performance measured.
  • The proposed compound unfolded aplanats can irradiate the reactor over nearly its full circumference, collecting lamp emission without light recycling optics.

Conclusions:

  • Near-field unfolded aplanats, such as the double-ellipsoid mirror, offer a viable solution for high-efficiency remote irradiance reconstitution.
  • Compound unfolded aplanats represent a significant advancement in reactor design, enabling efficient and uniform irradiation.