| 摘要 |
A holographic digital data processing system is described in which the data is stored holographically in a recording medium with the data insertable and retrievable in a sequential manner. A modulated data beam and a similarly modulated reference beam are passed through various deflectors to intersect at the recording medium to form the local holographic pattern. The location in the recording of the intersection is controlled by a page deflector which deflects both beams through the same angle and the angle of intersection is controlled by a data deflector which deflects only the data beam. Therefore, each data bit is recorded with a distinct angular relationship between the interfering data and reference beams. During reconstruction, the reference beam is occluded and the data beam is passed through both the data deflector and the page deflector to intersect the recording medium at the unique address of a single bit of digital data which is desired to be read out. The image of that bit is formed in an image plane at a fixed location for all bits. A single photodetector is positioned at that location and serves to read-out the data stored in the holographic memory. In this manner, sequential digital data storage and retrieval is accomplished with a holographic storage medium.
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