| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize an optical system for multiple recording or reproducing of information using holography. SOLUTION: The pickup 11 of an optical information recording/reproducing device spatially modulates a laser beam emitted from a light source 25 according to recorded information by a space light modulator 18 to generate an information beam, and further, spatially modulates the phase of the laser beam from the light source 25 by a phase space light modulator 17 to generate a recording reference beam whose phase is spatially modulated. An optical information recording medium 1 is irradiated by the information beam and the recording reference beam so as to be converged on positions different from each other, and the information is recorded on a hologram layer 3 in an interference pattern due to interference between the information beam and the recording reference beam reflected by a reflection film 5. The information beam and the recording reference beam are positioned based on the information recorded in an address servo area 6. |
