期刊
OPTICS EXPRESS
卷 19, 期 12, 页码 11597-11604出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.011597
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资金
- European Commission [ICT-2007-2-224205]
- Regione Lombardia [ID-MAN-18-16559 MINILAB]
We report on the fabrication of binary Fresnel lenses by femtosecond laser surface ablation of poly(methyl methacrylate) (PMMA) substrates. Tight focusing of the laser pulses produced a minimum ablated feature size of 600 nm, enabling the creation of lenses with numerical apertures as high as 0.5 and focal lengths ranging from 500 mu m to 5 mm. A precise control of the ablation depth allowed the achievement of a 30% focusing efficiency, close to the maximum theoretical value for this kind of lenses. (C) 2011 Optical Society of America
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