Journal
OPTICS EXPRESS
Volume 10, Issue 19, Pages 978-983Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.10.000978
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We fabricated the Fresnel zone plate by embedding voids in silica glass. We investigated the focusing properties by launching a He-Ne laser beam into the zone plate. The spot size of the primary focal point was 7.0 mum and agreed with the theoretical value of 6.1 mum. The diffraction efficiency was 2.0 %. This technique enables us to make alignment free micro-scale lenses inside bulk materials. (C) 2002 Optical Society of America.
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