19 October 2012 Radially symmetric freeform lens design for extended sources
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This paper describes a process for designing a radially-symmetric lens that receives light from a uniform, Lambertian disk of finite size and produces a prescribed intensity distribution. An algorithm is presented to design such a lens based on input parameters including the source diameter and luminance, the vertex location and center thickness of the lens, the desired output intensity distribution, and the output beam angle. The design process involves starting with a small center portion of the lens and progressively adding discrete, continuous sections around its diameter. Each section is tailored to produce the desired intensity in the output beam based on the projected area of the source in the far field according to the principle of luminance engineering.
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Peter Goldstein, Peter Goldstein, } "Radially symmetric freeform lens design for extended sources", Proc. SPIE 8487, Novel Optical Systems Design and Optimization XV, 84870C (19 October 2012); doi: 10.1117/12.928329; https://doi.org/10.1117/12.928329


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