Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2005-03-01
2005-03-01
Dunn, Drew A. (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S003000, C359S010000, C359S011000, C359S032000, C359S033000, C359S035000
Reexamination Certificate
active
06862120
ABSTRACT:
In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a recording medium having a shape of parallel flat plates, the signal light beam and the recording reference light beam cross each other within the recording medium, and a gate light beam having a second wavelength for revealing recording sensitivity of the recording medium is simultaneously irradiated to the recording medium so as to pass through a portion of the recording reference light beam and demarcate a volume smaller than that of this crossing portion.
REFERENCES:
patent: 6301028 (2001-10-01), Tanaka et al.
patent: 6320683 (2001-11-01), Ito et al.
patent: 6414762 (2002-07-01), Yamaji et al.
Hatano Hideki
Itoh Yoshihisa
Kouno Tomomitsu
Matsushita Hajime
Tanaka Satoru
Dunn Drew A.
McGinn & Gibb PLLC
Pioneer Corporation
Pritchett Joshua L
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