Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-06-21
2005-06-21
Edun, Muhammad (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S275100, C369S112010
Reexamination Certificate
active
06909684
ABSTRACT:
A holographic recording and/or retrieval method and apparatus are provided. An optical recording medium is used which has a recording layer, formed on a surface of a transparent substrate, through which light having an incident angle of a predetermined value or more with respect to the surface is guided, and which changes a refractive index or absorption coefficient upon simultaneous irradiation of signal light of a predetermined wavelength and reference light, and can record holograms by holding the changed refractive index or absorption coefficient. During recording, a hologram is recorded by simultaneously irradiating the recording layer with signal light of predetermined wavelength and reference light. During retrieval, reading light of wavelength that does not change a refractive index or absorption coefficient of the recording layer is guided through the recording layer, and a hologram is retrieved by diffracted light produced when the reading light is guided through the recording layer.
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Katsunori Kawano et al., “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain”, Optic Letters, vol. 24, No. 18, Sep. 1999.
Kawano Katsunori
Maruyama Tatsuya
Minabe Jiro
Shimizu Masaaki
Yasuda Shin
Edun Muhammad
Fuji 'Xerox Co., Ltd.
Oliff & Berridg,e PLC
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