25 August 2010 Freeform lens design using a spreadsheet
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In illumination optics an important design task is to create a light source with a certain intensity profile. One way to achieve this is to use LEDs and secondary optics that use freeform surfaces. Freeform lens design is a very powerful tool with many sophisticated design techniques. However, it is not always necessary to use difficult techniques or complicated software algorithms to design a freeform lens surface. This paper presents a method for designing a radially-symmetric freeform lens using a spreadsheet. The spreadsheet designs freeform lenses that transform a Lambertian (cosine[theta]) intensity profile from a light source to any output profile of the form (cosine^N[theta]) where N is a real number. The input and output are radially symmetric, and the lens controls the angular extent (cone half-angle) of the output beam. Several example lenses are presented and one lens is analyzed with a raytrace simulation.
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Peter Goldstein, Peter Goldstein, } "Freeform lens design using a spreadsheet", Proc. SPIE 7787, Novel Optical Systems Design and Optimization XIII, 778703 (25 August 2010); doi: 10.1117/12.858352; https://doi.org/10.1117/12.858352

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