Open AccessFabrication of Fresnel zone plate embedded in silica glass by femtosecond laser pulses
Author(s) -
Wataru Watanabe,
Daisuke Kuroda,
Kazuyoshi Itoh,
Junji Nishii
Publication year - 2002
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.10.000978
Subject(s) - zone plate , optics , fresnel zone , materials science , femtosecond , fresnel number , laser , fabrication , fresnel diffraction , laser beams , diffraction , diffraction efficiency , silica glass , beam (structure) , physics , medicine , alternative medicine , pathology
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.