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Variable-diameter refractive beam shaping with freeform optical surfaces

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Abstract

We propose a refractive two-element system that converts the Gaussian irradiance of an incident laser beam into a nominally flat-top output spot at a given distance with the capability to vary the spot diameter. The elements are high-order freeform surfaces that, when laterally translated, form a variable composite beam shaper. The general approach for determining the required freeform surfaces is discussed, and example design results are presented.

© 2011 Optical Society of America

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