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Fabrication of binary Fresnel lenses in PMMA by femtosecond laser micromachining

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Abstract

Binary Fresnel lenses are fabricated by ablation of PMMA substrates with a femtosecond laser. The minimum feature size in our experimental conditions is 600 nm. Lenses with good transparency and focal lengths in the range from 500μm to 5mm are obtained, with a maximum efficiency close to the theoretical one.

© 2011 Optical Society of America

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