Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-01-01
2008-01-01
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112100, C369S112150
Reexamination Certificate
active
09674402
ABSTRACT:
The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (2). The recording of the information is in the form of data pages stored as thin Fourier holograms (61). According to the invention, it is foreseen to use reflected transmission and polarisation holography with different write and read wavelengths, and to correct during reading the distortion in the readout channel caused by the difference between the write and read wavelengths. The invention further relates to an apparatus and system for performing the method. There is also disclosed a method of coding the recorded information.
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Hvilsted Sören
Koppa Pál
Lörincz Emöke
Ramanujam P. S.
Richter Peter
Chu Kim-Kwok
McDonnel Boehnen Hulbert & Berghoff LLP
Riso National Laboratory
Wellington Andrea
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