Holographic memory devices with bulk recording of information

An investigation was made of a holographic memory device in which information was recorded in bulk on separate holograms. A method for ensuring the constancy of the spatial positions of the images reproduced from different holograms was developed. It was found that an image converter could be used effectively to amplify the brightness of the reconstructed image. A lithium niobate electrooptical deflector was used for switching the beam of light between 1024 discrete positions. Each hologram of about 1 mm diameter contained 5 · 10³ bits of information.