Angular and spatial overlapping apparatus for holographic memories and volumetric holographic digital data storage system having the apparatus

摘要

The present invention relates to a bulk holographic digital data storage system having an angular and spatial superimposition device for a holographic memory, wherein the angle and spatial superposition device is arranged such that object light modulated from the spatial light modulator (30) is incident, A plurality of light refraction crystals 60 incident on the mirrors 28 to record hologram data of interference fringes and a rotatable table 60 disposed at equal intervals of each of the plurality of light refraction crystals 60 And an actuator 110 for rotating the table 120. When the table 12 is rotated at an angle, the hologram data is superimposed on the rotation of the table 12, So that the hologram data is recorded.;According to the present invention, since the table is finely rotated at the time of angle overlap and rotated by the next optical refraction crystal upon overlapping the space, not only the conventional AOD for angle and space superposition but also the corresponding frequency correction device are unnecessary, In short, the system has the effect of being able to construct a low-cost and low-cost system.