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Dual-step method to manufacture a polymeric GRIN lens with a high refractive index range

Fausta Loffredo, Fulvia Villani, Anna De Girolamo Del Mauro, Giuliano Sico, and Giuseppe Nenna

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Abstract

We introduce a new method to obtain gradient index (GRIN) lenses by dual-step process based on interdiffusion of two different polymeric solutions and gelation of the final mixture. The aim of the study was investigated as a simple process to produce a gel characterized by a continuous axial concentration gradient starting from two thermoplastic polymers [poly(vinyl alcohol) and poly(acrylic acid)] having different refractive indexes. We also introduced a laser scanning system that is conveniently implemented to analyze the refractive index variation in the samples.

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