Abstract

A nonuniform grid target tessellation method is proposed for designing a lens group with rectangular uniform illumination, a small screen incident angle, and high collection efficiency. A collimation lens is first designed to collimate the source rays preliminarily. Second, the source collected solid angle is tessellated so that each source ray encompasses the same flux. Third, the source rays are traced to the first surface of lens 2. Finally, the nonuniform grid target tessellation iteration is applied to find the integrability mapping. The freeform surface constructed with this method can exactly refract the rays to their corresponding target location, and the rectangular uniform illumination is accomplished. To verify the effectiveness of the proposed method, a design example is presented with a rectangular figuration and a high uniformity, the incident angle is smaller than 12° and the collection efficiency reaches 96% with Lambertian point source.

© 2015 Optical Society of America

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