Optical: systems and elements – Holographic system or element – Authentication
Reexamination Certificate
2005-11-21
2011-12-20
Doak, Jennifer L. (Department: 2872)
Optical: systems and elements
Holographic system or element
Authentication
C283S086000
Reexamination Certificate
active
08081358
ABSTRACT:
The present invention is provided to enhance security of a volume hologram by recording therein individualized information such as information of character, numerical character, picture pattern, biometric matter and/or the like by irradiating laser light to the volume hologram thereby modifying the same physically or chemically, and is related to a laser marking hologram comprising a volume hologram layer2including interference fringes recorded therein, wherein the volume hologram layer2includes information of character, numerical character, picture pattern, biometric matter, and/or the like recorded therein having a contrast between an irradiated portion and a non-irradiated portion thereof provided by selectively irradiating laser light10to the volume hologram layer2in a manner to modify11the irradiated portion.
REFERENCES:
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patent: 6535638 (2003-03-01), McGrew
patent: 2001/0046630 (2001-11-01), Toshine et al.
patent: 2003/0134105 (2003-07-01), Toshine et al.
Y. Ding, Femtosecond pulse shaping by dynamic holograms in photrefractive multiple quantum wells, Optics Letters, vol. 22, No. 10, May 15, 1997, at 715 available at http:www.physics.purdue.edu/people/faculty
olte/Shape.pdf.
Y. Ding, Femtosecond Pulse shaping by Dynamic Holograms in Photorefractive Quantum Wells, Optics Letters, vol. 22, No. 10, May 15, 1997, at 715 available at http: //www.physics.purdue.edu/people/faculty
olte/Shapes.pdf.
Ohtaki Hiroyuki
Ueda Kenji
Watanabe Masachika
Dai Nippon Printing Co. Ltd.
Doak Jennifer L.
Sughrue & Mion, PLLC
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