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5 September 2019 A laser pumping double-light-source module with photon-recycling
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We proposed a novel structure to perform photon recycling for a double-light-source illumination system pumped by a laser. In the design, two kinds of phosphor are located at the two focus of an elliptical reflective surface separately, after the phosphor on the first focus pumped by laser, the backward scattering light will refocus at the other phosphor layer at the second focus. The absorption spectrum of the second phosphor should fit that of the emission light by the first phosphor. When the emission spectrum covers red light, the whole system is a double-light-source module.
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Shih-Kang Lin, Yu-Wen Su, Xuan-Hao Lee, Yeh-Wei Yu, Tsung-Hsun Yang, and Ching-Cherng Sun "A laser pumping double-light-source module with photon-recycling", Proc. SPIE 11104, Current Developments in Lens Design and Optical Engineering XX, 111040K (5 September 2019);

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