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Minimum spot size and maximum detail in extended-source freeform illumination

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Abstract

It is not widely appreciated that freeform irradiance tailoring can produce irradiance patterns with sharply resolved features from extended light sources. However, conservation of étendue limits the amount of high frequency content, i.e., edges, that can be achieved in the irradiance pattern. We provide upper and lower bounds on the number of distinct sharp irradiance features that can be resolved from a thick freeform lens of unknown shape, and on the lens size needed to achieve a desired level of detail.

© 2021 The Author(s)

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