| 摘要 |
To properly reproduce information from a holographic memory even when a tilt error occurs in a direction vertical to a surface including optical axes of data light and reference light. During reproduction, a holographic memory ( 10 ) is fed stepwise from an initial access position with respect to a reproduction target block within a fixed back and forth range in a disk circumferential direction. In each stepwise-fed position, an SNR of a reproduction signal is calculated by an SNR calculation circuit ( 19 ) to detect the quality of the reproduction signal. A disk circumferential direction position in which an SNR becomes best is set in a circumferential direction position with respect to the reproduction target block.
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