OPTICAL INFORMATION RECORDING DEVICE USING HOLOGRAPHY AND PHASE MASK ARRANGEMENT POSITION ADJUSTMENT METHOD USED FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To improve, when an arrangement position of a phase mask is adjusted, an accuracy of adjustment with a simple adjustment sequence without recording/reproduction to a recording medium is performed.SOLUTION: An optical information recording device for recording digital information on an optical information recording medium using holography comprises: a light source emitting a light beam for recording on the optical information recording medium; a spatial modulator superposing information on the light beam; a photodetector acquiring diffraction light obtained from the recorded information when the information recorded on the optical information recording medium is reproduced; and a phase mask diffusing the phase of the light beam. The photodetector and the spatial modulator are arranged in a relation where optical distances of them from the optical information recording medium are equal to each other. The optical information recording device further comprises a phase mask arrangement position adjustment part moving the phase mask in a light beam travelling direction.SELECTED DRAWING: Figure 4