Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7907566 | Optical Materials | 2018 | 6 Pages |
Abstract
A simple and efficient technique for fabricating parabolic cylindrical microlens arrays (CMLAs) on the surface of fused silica by shaped femtosecond (fs) laser direct-writing is demonstrated. By means of spatially shaping of a Gaussian fs laser beam to a Bessel distribution, an inversed cylindrical shape laser intensity profile is formed in a specific cross-sectional plane among the shaped optical field. Applying it to experiments, large area close-packed parabolic CMLAs with line-width of 37.5â¯Î¼m and array size of about 5â¯Ãâ¯5â¯mm are produced. The cross-sectional outline of obtained lenslets has a satisfied parabolic profile and the numerical aperture (NA) of lenslets is more than 0.35. Furthermore, the focusing performance of the fabricated CMLA is also tested in this work and it has been demonstrated that the focusing power of the CMLA with a parabolic profile is better than that with a semi-circular one.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Zhi Luo, Kai Yin, Xinran Dong, Ji'an Duan,