Multi-element direct design using a freeform surface for a compact illumination system

Zhuang Zhenfeng; Surman Phil; Thibault Simon

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Multi-element direct design using a freeform surface for a compact illumination system

机译：多元件直接设计使用自由形式表面进行紧凑照明系统

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An iterative optimization algorithm is introduced to address the surface iterative errors as well as source extension issues in a freeform illumination system for producing satisfactory illumination distribution. A unique twoparameter coordinate system is utilized to represent the emitted ray directions. Then, the direction vector for the incident rays, which propagate through several surfaces, is obtained using ray-tracing techniques. Based on the mapping between the incoming rays and a target grid, a freeform surface is generated as a good starting design. An iterative optimization strategy is further employed to alleviate the deterioration of illumination distribution on the target region, and the uniformity of the illumination system is evaluated during optimization. Very few variables are demanded, and more flexibility in the design of the freeform surface is offered. Successive iterations can be performed until the desired result is attained. An optical system is used as an example to demonstrate the validity of the proposed method, and numerical simulations are carried out to evaluate the optical performance. The simulation results show that a small angular intensity distribution and prescribed rectangular illumination pattern can be achieved simultaneously. (C) 2017 Optical Society of America

机译：引入了一种迭代优化算法来解决基层迭代误差以及用于产生令人满意的照明分布的自由形式照明系统中的源扩展问题。唯一的Twoparameter坐标系用来表示发射的光线方向。然后，使用射线跟踪技术获得通过多个表面传播的入射射线的方向向量。基于输入光线和目标网格之间的映射，产生自由形状作为良好的起始设计。进一步采用迭代优化策略来缓解目标区域对照明分布的劣化，在优化期间评估照明系统的均匀性。需要很少的变量，提供了更少的变量，并提供了在自由形式表面的设计方面的灵活性。在实现所需结果之前，可以执行连续的迭代。使用光学系统作为示例以证明所提出的方法的有效性，并且执行数值模拟以评估光学性能。仿真结果表明，可以同时实现小角强度分布和规定的矩形照明图案。（c）2017年光学学会

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《Applied optics》 |2017年第32期|共8页
作者
Zhuang Zhenfeng; Surman Phil; Thibault Simon;
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Univ Laval Dept Phys Genie Phys &

Opt Ctr Opt Photon &

Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada;

Nanyang Technol Univ Sch Elect &

Elect Engn 50 Nanyang Ave Singapore 639798 Singapore;

Univ Laval Dept Phys Genie Phys &

Opt Ctr Opt Photon &

Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada;

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Multi-element direct design using a freeform surface for a compact illumination system

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