INFORMATION RECORDING DEVICE AND INFORMATION RECORDING METHOD

摘要

In recording technologies for batch formation of a plurality of recording bits in a recording medium by forming a plurality of optical spots using an ultrashort pulse laser and a spatial optical modulator, the hatch recordable hit number has an upper limit, resulting in restricted recording speed. The intensity of the optical spot is corrected to increase the batch recordable bit number for increasing the recording speed.

主权项

1. An information recording device comprising:
a stage for holding an information recording medium; a short pulse laser source; a spatial optical modulator for displaying a hologram pattern so that a laser beam emitted from the short pulse laser source is modulated; and an image forming optical system having a focal length in inverse proportion to a parameter relating to a wavelength, wherein a multi-point optical spot in accordance with the hologram pattern displayed on the spatial optical modulator is formed in the information recording medium held by the stage via the image forming optical system; and a structural change is caused in the information recording medium by the multi-point optical spot for information batch recording by utilizing at least a region where intensity of the optical spot for recording is equal to or lower than 80% of intensity of the optical spot on an optical axis in the case where the focal length of the image forming optical system does not depend on the wavelength.