Optical Design and Engineering

Freeform illumination lens design combining energy and intensity mapping

[+] Author Affiliations
Shudong Yu, Yong Tang, Zongtao Li, Yonghhui Chen, Binhai Yu, Guanwei Liang

South China University of Technology, Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, Guangzhou, China

Opt. Eng. 56(4), 045101 (Apr 11, 2017). doi:10.1117/1.OE.56.4.045101
History: Received January 5, 2017; Accepted March 22, 2017
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Abstract.  A composite method combining energy and intensity mapping is proposed to address the issue of surface error caused by the irregular sampling phenomenon in freeform illumination lens design. In the combined method, the central region of the freeform lens is designed by the intensity mapping method, whereas the peripheral region is designed by the energy-mapping method. Furthermore, an iterative feedback optimization is added to scale out the application in extended light sources. As an evaluating example, a freeform lens with a 120-deg viewing angle, fitted with an appropriate number of points is designed by the proposed combined method. Compared with that designed by the energy method, the lens forms a more uniform illumination on the target surface without the appearance of a hot spot in the central region. The proposed method also exhibits superiority in extended-source design, where only a one-time optimization is needed to achieve the preset uniformity with the proper choice of coefficients.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Shudong Yu ; Yong Tang ; Zongtao Li ; Yonghhui Chen ; Binhai Yu, et al.
"Freeform illumination lens design combining energy and intensity mapping", Opt. Eng. 56(4), 045101 (Apr 11, 2017). ; http://dx.doi.org/10.1117/1.OE.56.4.045101


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