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Competition showcases innovative optical design, achieving 53.3% efficiency in concentrator designs for a hypothetical solar system.
To celebrate the 20th anniversary of the Nonimaging Optics conference at SPIE Optics + Photonics 2025, we organized an optical design competition: "The XX Challenge". Set 200 years in the future, this challenge required participants to design a high-efficiency concentrator capable of focusing the light from an artificial XX-shaped star in the distant solar system 'Anniversaria XX' onto a cylindrical rod at the planet 'San Diegum'. Nine contestants submitted their designs for the competition. The winning solution, achieving 53.3% efficiency, was provided by Ludo Haenen from Signify.
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Smeesters et al. (2025) studied this question.
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