Invisible two-dimensional barcode fabrication inside a synthetic fused silica by femtosecond laser processing using a computer-generated hologram

Hayato Kawashima; Masahiro Yamaji; Jun'ichi Suzuki; Shuhei Tanaka

doi:10.1117/12.876087

11 February 2011 Invisible two-dimensional barcode fabrication inside a synthetic fused silica by femtosecond laser processing using a computer-generated hologram

Hayato Kawashima, Masahiro Yamaji, Jun'ichi Suzuki, Shuhei Tanaka

Author Affiliations +

Proceedings Volume 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI; 79251C (2011) https://doi.org/10.1117/12.876087
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Hayato Kawashima, Masahiro Yamaji, Jun'ichi Suzuki, and Shuhei Tanaka "Invisible two-dimensional barcode fabrication inside a synthetic fused silica by femtosecond laser processing using a computer-generated hologram", Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79251C (11 February 2011); https://doi.org/10.1117/12.876087

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