HOLOGRAPHIC STORAGE AND RETRIEVAL SYSTEM

摘要

Random selection of holograms from an array comprised of a plurality of holograms is achieved by light reflections from the selected holograms upon illuminating the entire array with a broad beam of coherent light. The array of discrete holograms is overlaid with a reflective magnetizable film, normally uniaxially oriented. When the magnetization vector in the film is rotated in any one or more of the discrete hologram areas, a proportional rotation in the plane of polarization of the reflected light will occur and be directed to a readout diode array. Disposed in the path of the reflected light is an analyzer which is set for maximum extinction when no readout is desired and minimum extinction when a readout is desired, the diode array providing electrical readout signals corresponding to the information read out from the selected hologram.