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Double freeform illumination design for prescribed wavefronts and irradiances

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Abstract

A mathematical model in terms of partial differential equations (PDE) for the calculation of double freeform surfaces for irradiance and phase control with predefined input and output wavefronts is presented. It extends the results of Bösel and Gross [J. Opt. Soc. Am. A 34, 1490 (2017) [CrossRef]  ] for the illumination design of single freeform surfaces for zero-étendue light sources to double freeform lenses and mirrors. The PDE model thereby overcomes the restriction to paraxiality or the requirement of at least one planar wavefront of the current design models in the literature. In contrast with the single freeform illumination design, the PDE system does not reduce to a Monge–Ampère type equation for the unknown freeform surfaces, if nonplanar input and output wavefronts are assumed. Additionally, a numerical solving strategy for the PDE model is presented. To show its efficiency, the algorithm is applied to the design of a double freeform mirror system and double freeform lens system.

© 2018 Optical Society of America

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