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J Opt Soc Am A Opt Image Sci Vis. 2002 Mar;19(3):590-5.

Tailored freeform optical surfaces.

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Optics & Energy Concepts, Munich, Germany.


Freeform optical surfaces embedded in three-dimensional space, without any symmetry, are tailored so as to solve the archetypal problem of illumination design: redistribute the radiation of a given small light source onto a given reference surface, thus achieving a desired irradiance distribution on that surface. The shape of the optical surface is found by solving a set of partial nonlinear differential equations. For most cases, a few topologically distinct solutions exist, given suitable boundary conditions.

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