Catadioptric freeform optical system design for LED off-axis road illumination applications

Zhengbo Zhu, Donglin Ma, Qiaomu Hu, Yongqian Tang, Rongguang Liang

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The aim of this paper is to develop a new composite structure of catadioptric optical system containing both freeform refractive surface and freeform total internal reflective (TIR) surface for LED road illumination applications. The role of freeform refractive part is to generate the shifted general rectangular illumination pattern to optimally match the shape of the road surface. The application of TIR mechanism is aimed to control the stray light in the sidewalk direction of the road luminaire and maximize the efficient energy efficiency. In this paper, we use the “double pole” ray mapping technique to design the refractive optical surface and the ?-? coordinate ray mapping technique to derive the freeform TIR surface. The simulation shows that the novel catadioptric design has relatively high collection efficiency, thus high average illuminance level inside the effective illumination area. This lens also has good control of stray light on the backside of the road luminaire.

Original languageEnglish (US)
Pages (from-to)A54-A65
JournalOptics Express
Issue number2
StatePublished - Jan 22 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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