| 摘要 |
It is an object to propose a recording method of carrying out a spatial optical phase modulation corresponding to recording data so that the data are recorded on a hologram recording medium in accordance with phase information and a reproducing method of carrying out proper reading-out of the recorded phase information to reproduce the recoded data. Signal light to which a phase modulation pattern is given in accordance with recording data and reference light to which a predetermined phase modulation pattern is given are irradiated to a hologram recording medium. With this, the recording data are recorded on the hologram recording medium by phase information of the recording data. At the reproduction time, the reference light and DC light with a total phase that has aπ/2 phase difference with respect to a standard phase in the reference light are irradiated to the hologram recording medium. Thus, reproducing light can be made in phase with the DC light, and the DC light can be added to the reproducing light as a component of the amplitude "1". In this way, the reproducing light to which the DC light is added is read out, so that the recorded phase information can be correctly read out.
|
