Patent ID: 8817585
Filing Date: 2014-08-26
Classification: G03H,G11B

Abstract:
1. A reproduction apparatus of a holographic memory in which a first hologram produced from reference light and signal light including a spatial phase modulation signal or a spatial quadrature amplitude modulation signal is recorded, the reproduction apparatus comprising: a hologram diffracted light production section that produces diffracted light of the first hologram by irradiating the holographic memory with first reference light; a hologram production section that changes a phase of second reference light capable of interfering with the diffracted light of the first hologram, and simultaneously produces a plurality of second holograms from the diffracted light of the first hologram and the second reference light of which the phase is changed; a detection section that detects an intensity distribution of each of the plurality of second holograms; and a processing section that demodulates the spatial phase modulation signal or the spatial quadrature amplitude modulation signal on the basis of the plurality of intensity distributions.