Optical recording method, optical reproduction method, optical recording apparatus, and optical recording medium

An optical recording apparatus comprising:

• a shift-multiplex recording unit configured to record information on a recording layer for holographically recording information in an optical recording medium by irradiating the optical recording medium with an information beam and a reference beam, and to repetitively record information on the recording layer while moving at least any one of the information beam and reference beam and the recording layer along the surface of the recording layer, and
• an irradiation unit configured to irradiate the optical recording medium on a recording pulse basis,
• wherein the peak intensity of light of the recording pulse is 0.1 mW to 100 mW, the irradiation time is 0.05 nsec to 1×105 nsec, and the irradiation of recording pulse is performed 5 times to 1×107 times per 1 msec.

An optical recording medium, with information recorded therein, which is recorded by an optical recording method,

• wherein the optical recording method comprises:
• recording information on a recording layer for holographically recording information in an optical recording medium by irradiating the optical recording medium with an information beam and a reference beam, and repetitively recording information on the recording layer while moving at least any one of the information beam and reference beam and the recording layer along the surface of the recording layer, thereby being capable of shift-multiplex recording operations,
• wherein the optical recording medium is irradiated on a recording pulse basis, the peak intensity of light of the recording pulse is 0.1 mW to 100 mW, the irradiation time is 0.05 nsec to 1×105 nsec, and the irradiation of recording pulse is performed 5 times to 1×107 times per 1 msec.