Holographic memory systems have been widely researched since 1963. However,
the size of the drives required and the deterioration of reconstructed data resulting from
shrinkage of the medium have made practical use of a hologram memory difficult. In light of
this, we propose a novel holographic recording/reconstructing system: a dual-reference beam
reflection system that is smaller than conventional systems such as the off-axis or co-axis
types, and which is expected to increase the number of multiplexing in angle multiplexed
recording. In this multiplex recording system, two laser beams are used as reference beams,
and the recorded data are reconstructed stably, even if there is shrinkage of the recording
medium. In this paper, a reflection holographic memory system is explained in detail. In
addition, the change in angle selectivity resulting from shrinkage of the medium is analyzed
using the laminated film three-dimensional simulation method. As a result, we demonstrate
that a dual-reference beam multiplex recording system is effective in reducing the influence
of medium shrinkage.
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