Method for producing a duplicate hologram recording medium, apparatus for producing a duplication master, apparatus for producing a duplicate hologram recording medium, and duplication master

An apparatus for producing a duplication master used for duplicating a hologram carrying recording data onto a duplicate hologram recording medium, comprising:

• a beam splitter that splits a light beam from a laser light source into a coaxial beam and a master-producing reference beam;
• a spatial light modulator that performs spatial light modulation on the coaxial beam to generate a modulated coaxial beam in which a predetermined reference beam and a signal beam corresponding to recording data are arranged coaxially;
• condenser means for condensing the modulated coaxial beam to a recording layer of the duplication master;
• and
• hologram-forming-position moving means for moving a position of the recording layer where a hologram is formed due to interference between the master-producing reference beam and the modulated coaxial beam,
• wherein
• the duplication master has a recording layer in which a hologram is recorded, and a polarization-dependent angle selective film, the polarization-dependent angle selective film being configured to have a transmittance sufficient for forming the hologram with respect to a light beam having a predetermined polarization direction irrespective of an incidence angle, and to have a transmittance that changes in accordance with an incidence angle of a light beam with respect to a polarization direction different from the predetermined polarization direction, and
• the master-producing reference beam and the modulated coaxial beam that are polarized in the predetermined polarization direction are radiated to the duplication master.

An apparatus for producing a duplication master used for duplicating a hologram carrying recording data onto a duplicate hologram recording medium, comprising:

• a beam splitter that splits a light beam from a laser light source into a coaxial beam and a master-producing reference beam;
• a spatial light modulator that performs spatial light modulation on the coaxial beam to generate a modulated coaxial beam in which a predetermined reference beam and a signal beam corresponding to recording data are arranged coaxially;
• a condenser section condensing the modulated coaxial beam to a recording layer of the duplication master while correcting for an aberration generated when duplicating the duplicate hologram recording medium in advance;
• and
• a hologram-forming-position moving section moving a position of the recording layer where a hologram is formed due to interference between the master-producing reference beam and the modulated coaxial beam.

An apparatus for producing a duplication master used for duplicating a hologram carrying recording data onto a duplicate hologram recording medium, comprising:

• a beam splitter that splits a light beam from a laser light source into a coaxial beam and a master-producing reference beam;
• a spatial light modulator that performs spatial light modulation on the coaxial beam to generate a modulated coaxial beam in which a predetermined reference beam and a signal beam corresponding to recording data are arranged coaxially;
• a condenser section condensing the modulated coaxial beam to a recording layer of the duplication master;
• and
• a hologram-forming-position moving section moving a position of the recording layer where a hologram is formed due to interference between the master-producing reference beam and the modulated coaxial beam,
• wherein
• the duplication master has a recording layer in which a hologram is recorded, and a polarization-dependent angle selective film, the polarization-dependent angle selective film being configured to have a transmittance sufficient for forming the hologram with respect to a light beam having a predetermined polarization direction irrespective of an incidence angle, and to have a transmittance that changes in accordance with an incidence angle of a light beam with respect to a polarization direction different from the predetermined polarization direction, and
• the master-producing reference beam and the modulated coaxial beam that are polarized in the predetermined polarization direction are radiated to the duplication master.