Computer Science
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3633..279o&link_type=abstract
Proc. SPIE Vol. 3633, p. 279-284, Diffractive and Holographic Technologies, Systems, and Spatial Light Modulators VI, Ivan Cindr
Computer Science
Scientific paper
The optical system for writing down and reconstruction 2D hologram matrix, consisted of Fourier-holograms of data pages is developed. This system may be used in page-based holographic card storage devices, includes two separate parts--data writing and data reading devices. By this concept data writing down may be made by unique stationary device and data reading realized by some quite simple devices of different users. The hologram write down arrangement included laser source beam splitter, object, and reference parts. Object part includes beam telescope expander, 2D spatial light modulator, and Fourier-objective. Spatial light modulator forms input data page. Reference part include cylindrical lens beam expander, and 1D spatial light modulator. Reference beam is directed to the holographic media plane with the perpendicular incidence. The hologram matrix string is written down by simultaneously discrete moving of arrangement object part entries. Herewith the image placement of the input data page does not change. This hologram write down arrangement allows us to make data page reconstruction to the matrix photodetector directly by the light of compact semiconductor laser. Moreover, it is necessary to provide only 1D mechanical moving while data reading out from the hologram matrix.
Borisov Michael V.
Odinokov Sergey B.
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