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We demonstrated that introducing multi-layered technique into collinear holographic memory can realize higher quality holographic recording/reading and expand the storage density by a factor of 2 through homogeneous utilization of the recording medium.

Our new analysis tool can be capable of calculations more than 30 times faster than the previous method and enables to estimate practical memory densities including not only recording and reconstruction process but also error correction process.

A double-referential method, in which the reference light necessary for phase detection can be generated as diffraction light of the optical hologram automatically, is newly proposed. 16-SQAM signals can be reconstructed through dual-stage holography.

A self-referential holographic recording geometry, in which signal beam works as reference beam for recording of itself, having many attractive advantages is newly proposed. The purely one-beam holographic operation is performed by simulation and experiment.