Study on large capacity optical data storage

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To achieve the holographics memory of the playback-only type, the phase multivalued record method to use the pit pattern with different depth was examined. Because the multiplicity had not improved in a past ROM method, the method to record multivalued newly in the direction of the pit depth was examined. It was clarified to be able to make eight steps for the direction of depth by using the electron beam cutting technology about the sample making. The phase diversity and the homodyne detection were simulated about the reproduction simulation. The phase was confirmed and it was confirmed to be able to reproduce the separation by eight values. The accuracy of the experiment and the simulation will be improved in addition in the future, and the improvement of storage capacity is aimed at.