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An additive manufacturing platform, including nanocomposite materials and 3D printing, is presented that allows 3D-freeform gradient index (GRIN) functions to be fabricated within planar or surfaced lens elements. The degrees of design freedom allow for realization of complex optical functions that reduce optical system size and weight.
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George M. Williams Jr., "Additive manufacturing of freeform gradient index optics," Proc. SPIE 11889, Optifab 2021, 118890R (28 October 2021); https://doi.org/10.1117/12.2602847