Design of double freeform-surface lens for LED uniform illumination with minimum Fresnel losses |
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| Authors: | Run Hu Zhiqiang Gan Xiaobing Luo Huai Zheng Sheng Liu |
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| Institution: | 1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;3. School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | In this study, we demonstrated a double freeform-surface lens to realize uniform illumination and minimum Fresnel losses for light-emitting diode (LED). In the present design, the inner surface and outer surface of the freeform lens were designed simultaneously, thus the light path can be controlled more flexibly. The detailed calculation and design process were presented. Monte Carlo ray-tracing simulation and Fresnel losses calculation were conducted to validate the present freeform lens. The simulation and calculation results indicated that the present freeform lens could enhance the illumination uniformity greatly and realize minimum Fresnel losses as low as 7.67%. |
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| Keywords: | Light-emitting diode (LED) Non-imaging optics Freeform lens Fresnel loss Illumination |
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