| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such problems that, since a holographic memory by the angle multiplexing recording method uses Bragg selectivity, when reading data recorded in a recording medium, it is required to highly accurately reproduce optical conditions of reference light used in recording, and further, since optimal optical conditions may be changed by thermal, mechanical and optical disturbance factors, a mechanism for compensating the disturbance factors is required. <P>SOLUTION: The problem is resolvable by: applying the reference light to an optical information recording medium; detecting the intensity of diffracted diffraction light by an optical detector; generating an error signal based on a value obtained by differentiating the detected intensity of the diffraction light by a reference light angle; and performing a feedback control to a reference light angle control element. <P>COPYRIGHT: (C)2012,JPO&INPIT |
