VOLUME HOLOGRAPHIC DIGITAL DATA STORAGE SYSTEM USING PHASE CODE MULTIPLE TYPE

摘要

PURPOSE: A volume holographic digital data storage system using a phase code multiple type is provided to improve amount of storage of hologram data. CONSTITUTION: The volume holographic digital data storage system using the phase code multiple type comprises a source of light producing a laser beam, a beam magnifying unit enlarging the laser beam and sending a first reference beam on a first optic path, a second reference beam on a second optic path parallel to the first optic path and a signal beam on a third optic path disposed between the first optic path and the second optic path. The volume holographic digital data storage system using the phase code multiple type also comprises a LCD including a first phase code multiple area corresponding to the first optic path, a second phase code multiple area corresponding to the second optic path and a space optic modulation area corresponding to the third optic path, a first reflector reflecting the first reference beam fully, a second reflector reflecting the second reference beam fully, a storage medium storing interference pattern and producing the optic-changed beam and a CCD transferring the signal beam produced by the storage medium into an electrical signal.