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 500 mu m to 5mm are obtained, with a maximum efficiency close to the theoretical one.
Fabrication of binary Fresnel lenses in PMMA by femtosecond laser micromachining
Eaton S M;Ramponi R;Cerullo G;Osellame R
2011
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 500 mu m to 5mm are obtained, with a maximum efficiency close to the theoretical one.File in questo prodotto:
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