本論文中，我們提出一個新穎的光學結構，不但具有光子循環的功能，亦可以應用於雷射之雙光源照明系統。在設計上，該結構為一橢圓反射面，第一個焦點放置可產生白光的螢光介質，進而形成白光光源，其背向散射的光子經橢圓反射面匯聚至第二個焦點，其上設有另一個螢光介質，其吸收頻譜應與第一個焦點之螢光配合。當第二個焦點上的螢光介質為紅外線的激發光時，本機構即可形成白光與紅外光的雙光源。為求以本機構作為車頭燈的光源，以橢圓率作為評估的參數之一進行優化，並展示多種設計成果。

In this thesis, we proposed and demonstrated a novel structure to perform photon recycling for a double-light-source illumination system pumped by a laser. In the design, a phosphor layer is located at the first focus of an elliptical reflective surface, which is used to recycle the backward scattering light and refocus at the other phosphor layer at the second focus. The absorption spectrum should fit that of the emission light by the first phosphor. When the emission spectrum covers infrared light, the whole system is a double-light-source for white light and infrared light. In order to apply the proposed structure to automotive headlamp, we have optimized the structure by considering the ellipticity. Thus we evaluated various designs based on the proposed structure.

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