VOLUME HOLOGRAPHIC DIGITAL STORAGE SYSTEM HAVING ERROR CHECKING FUNCTION

摘要

PURPOSE: A volume holographic digital storage system is provided to have an error checking function. CONSTITUTION: The volume holographic digital storage system comprises: a source of light(105) for generating laser beam of a first deflection light; a first light divider(110) for the laser beam of the first deflection light into a reference light of a first deflection light and an object light of a first deflection light; a first reflection mirror(125) for reflecting a first reference light of the first deflection light; a second reflection mirror(115) for reflecting the object light of the first deflection light; a second light divider(155) for dividing the object light of the first deflection light reflected by the second reflection mirror(115) into a second reference light of the first deflection light and an object light of the first deflection light; a third reflection mirror(120) for reflecting the second reference light of the first deflection light divided by the second light divider(155); a lambda/2 plate(160) for rotating the second reference light of the first deflection light 90 degree to convert into the second reference light of the second deflection light; a fourth reflection mirror(130) for reflecting the second reference light of the second deflection light; a spatial light modulator(140) for modulating the object light of the first deflection light divided by the second light divider(155) into a page unit of data inputted from exterior, wherein the modulator(140) modulates the object light of the first deflection light into the object light of the second deflection according to the inputted data; a storage medium(145) for storing an interfere pattern between the first reference light of the first deflection and the object light of the first deflection light and an interfere pattern between the second reference light of the second deflection and the object light of the second deflection light, wherein the storage medium(145) regenerates the reference light of the first deflection when the first reference light of the first deflection is illuminated and regenerates the object light of the second deflection when the second reference light of the second deflection is illuminated; a charge coupled device(150) for converting an object light regenerated from the storage medium(145) into an electrical signal; a digital signal processing part(165) for processing an output signal from the device(150) with a digital signal to output an image signal; an image signal processing part(170) for processing the signal processed by the part(165) with an image signal; and a monitor(175).