title: Design of compact and smooth free-form optical system with uniform illuminance for LED source.
abstract: A feedback modification method based on variable separation mapping is proposed in the design of free-form optical system with uniform illuminance for LED source. In this method, the non-negligible size of LED source is taken into account, and a smooth optical system is established with single freeform surface regenerated by adding feedback to the lens design for a point light source. More rounds of feedback can improve the lens performance. As an example, a smooth free-form lens with rectangular illuminance distribution is designed, and the illuminance uniformity is improved from 18.75% to 81.08% after eight times feedback.
authors.affiliation: State Key Lab on Integrated Optoelectronics/Tsinghua National Lab on Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing, 100084, P. R. China. luoy@tsinghua.edu.cn
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.forename: Zexin
authors.initials: Z
authors.lastname: Feng
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Han
authors.forename: Hongtao
authors.initials: H
authors.lastname: Li