The scheme of a 3D optical memory with layer-by-layer information storage-in which a pair of thick holograms is used as an information layer-is theoretically studied. It is shown that the contributions from holograms stored in a layer to a diffracted wave can cancel one another if the hologram materials and an inter-layer medium are properly selected. The methods for violating the contribution cancellation condition, which make it possible to realize the selective readout of the required information layer, are presented. Additional requirements for the media parameters and the read-write scheme caused by the use of holograms with a sufficiently large thickness are determined. Problems of practically-implementing the studied optical memory scheme are considered.
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