5 November 2014 Feedback modification strategy for designing a free-form optical surface with given illumination pattern
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Abstract
In order to achieve a uniform illumination distribution confined to a given rectangular region, a feedback modification strategy is introduced in the design of free-form optical surface. The whole process of this strategy includes two steps: solving the initial structure and feedback process. To solve the initial surface, we first divide the source space along its longitude and latitude direction with uniform angel. Because the energy of each longitude and latitude micro-belt of free-form surface and each corresponding micro-belt on the target plane is equal, the target plane can be divided into grids, and then the mapping relationship of source space and target space is constructed. By using Snell’s Law and tangent plane iterative method, we obtain the coordinates of all grid nodes and an initial free-form surface can be constructed. Afterwards we use specific feedback algorithm to improve the illuminating performance. This method is proved to be efficient, the shape of illumination spot is dramatically improved and the design result is satisfactory.
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Yuhao Chen, Yuhao Chen, Zhaofeng Cen, Zhaofeng Cen, Xiaotong Li, Xiaotong Li, Yun Dong, Yun Dong, } "Feedback modification strategy for designing a free-form optical surface with given illumination pattern", Proc. SPIE 9272, Optical Design and Testing VI, 927207 (5 November 2014); doi: 10.1117/12.2071400; https://doi.org/10.1117/12.2071400
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