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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 35 — Dec. 10, 2009
  • pp: 6627–6634

Freeform surface lens for LED uniform illumination

Zheng Zhenrong, Hao Xiang, and Liu Xu  »View Author Affiliations

Applied Optics, Vol. 48, Issue 35, pp. 6627-6634 (2009)

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A method using a freeform surface lens for LED secondary optic design is proposed in this paper. By Snell’s Law, the differential equations are given to build the relationship between the normal direction of a freeform surface and its input/output ray vectors. Runge–Kutta formulas are used to calculate the differential equations to design the freeform surface. Moreover, the optical model for uniform illumination is simulated and optical performance is analyzed. A practical freeform surface lens for LED uniform illumination is fabricated using an injection molding method. By the process, our system demonstrates a uniform illumination with a divergence half-angle of 6 ° and an efficiency of 78.6%.

© 2009 Optical Society of America

OCIS Codes
(220.4610) Optical design and fabrication : Optical fabrication
(220.2945) Optical design and fabrication : Illumination design

ToC Category:
Optical Design and Fabrication

Original Manuscript: August 20, 2009
Revised Manuscript: October 27, 2009
Manuscript Accepted: October 27, 2009
Published: December 1, 2009

Zheng Zhenrong, Hao Xiang, and Liu Xu, "Freeform surface lens for LED uniform illumination," Appl. Opt. 48, 6627-6634 (2009)

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