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Proceedings Paper

Feedback modification strategy for designing a free-form optical surface with given illumination pattern
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Paper 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.

Paper Details

Date Published: 5 November 2014
PDF: 10 pages
Proc. SPIE 9272, Optical Design and Testing VI, 927207 (5 November 2014); doi: 10.1117/12.2071400
Show Author Affiliations
Yuhao Chen, Zhejiang Univ. (China)
Zhaofeng Cen, Zhejiang Univ. (China)
Xiaotong Li, Zhejiang Univ. (China)
Yun Dong, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 9272:
Optical Design and Testing VI
Yongtian Wang; Chunlei Du; José Sasián; Kimio Tatsuno, Editor(s)

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