Abstract

In this paper, we design a three-stage Fresnel lens concentrator with a low $f$ number. The proposed concentrator consists of a primary optical element (POE) and a second optical element (SOE). The nine-sector three-stage Fresnel lens is composed of three types of triangular prisms: the refractive triangular prism, single total internal reflection triangular prism, and double total internal reflection triangular prism. In order to increase the uniformity and acceptance angle of the POE coupled to the SOE, the SOE is also divided into nine sectors. Finally, it is found that this nine-sector three-stage Fresnel lens concentrator can achieve a concentration ratio of $\mathrm{1000}\times$; the uniformity is 25.8, optical efficiency is 81.8%, $f$ number is 0.46, and acceptance angle is $\pm 0.73°$.

© 2018 Optical Society of America

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