HOLOGRAPHIC MEMORY SYSTEM USING DUAL MULTIPLEXING

摘要

PURPOSE: A device for storing a holographic based on a complex multiplexing is provided to store ultra large-sized capacity of information in a light refraction storing medium by performing an angle multiplexing through rotating a light refraction storing medium discretely in accordance with a predetermined minute angle in a spatial area and performing a wavelength multiplexing through a wavelength variable laser. CONSTITUTION: A wavelength variable laser varies a wavelength of a laser beam and creates a wavelength variable laser beam for a wavelength multiplexing of input data. A beam splitter separates the wavelength variable laser beam optically and makes a reference beam and an object beam for forming different light paths thereto. A spatial light modulating unit makes a signal beam by being irradiated by the object beam. A light refraction storing medium stores holographic data formed by interfering the signal beam and the reference beam. A stepping motor provides a rotating force for making the holographic data be recorded in the light refraction storing medium. The first iris diaphragm penetrates or cuts-off the object beam. The second iris diaphragm penetrates or cuts-off the reference beam. The first reflection mirror changes a progress direction for making the signal beam look toward the light refraction storing medium. The second reflection mirror changes a progress direction for making the reference beam look toward the light refraction storing medium. A holographic memory control unit generally controls the above elements. A video sensing unit reads the holographic data reproduced from the light refraction storing medium by controlling of the holographic memory control unit.