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Proceedings Paper

Invisible two-dimensional barcode fabrication inside a synthetic fused silica by femtosecond laser processing using a computer-generated hologram
Author(s): Hayato Kawashima; Masahiro Yamaji; Jun'ichi Suzuki; Shuhei Tanaka
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Paper Abstract

We report an invisible two-dimensional (2D) barcode embedded into a synthetic fused silica by femtosecond laser processing using a computer-generated hologram (CGH) that generates a spatially extended femtosecond pulse beam in the depth direction. When we illuminate the irradiated 2D barcode pattern with a 254 nm ultraviolet (UV) light, a strong red photoluminescence (PL) is observed, and we can read it by using a complementary metal oxide semiconductor (CMOS) camera and image processing technology. This work provides a novel barcode fabrication method by femtosecond laser processing using a CGH and a barcode reading method by a red PL.

Paper Details

Date Published: 11 February 2011
PDF: 9 pages
Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79251C (11 February 2011); doi: 10.1117/12.876087
Show Author Affiliations
Hayato Kawashima, New Glass Forum (Japan)
Masahiro Yamaji, New Glass Forum (Japan)
Jun'ichi Suzuki, New Glass Forum (Japan)
Shuhei Tanaka, New Glass Forum (Japan)


Published in SPIE Proceedings Vol. 7925:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI
Alexander Heisterkamp; Joseph Neev; Stefan Nolte, Editor(s)

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