Method and apparatus for holographic recording

An apparatus for hologram recording, in which holograms are recorded in a method of tiling an entire recording surface of a holographic recording medium by interfering with an object beam and a reference beam for each divided hogel on the holographic recording medium divided in units of hogels and recording the holograms using holographic printing technology, the apparatus comprising:

• a laser configured to output a laser beam;
• a beam splitter configured to split the laser beam into an object beam and a reference beam;
• a control computer configured to generate a computer-generated hologram (CGH) fringe pattern;
• an object beam optical unit configured to transmit the object beam to the holographic recording medium and record the object beam;
• a reference beam optical unit configured to allow the reference beam to be incident on the holographic recording medium,
• wherein the control computer analyzes deviations in diffraction efficiency for each hogel according to a recording angle for each hogel when holograms are recorded on the holographic recording medium for each hogel, and
• wherein the recording angle refers to a crossing angle formed by the object beam and the reference beam when the holograms are recorded by interference of the object beam and the reference beam on the holographic recording medium;
• and
• pre-compensates the deviations by varying an intensity of the object beam for each hogel according to the deviations in diffraction efficiency,
• wherein the object beam optical unit comprises:
• a spatial light modulator configured to modulate the incident object beam using the CGH fringe pattern provided by the control computer, and vary the intensity of the object beam for each hogel in accordance with the pre-compensated intensity, and
• a condensing lens configured to condense the object beam modulated by the spatial light modulator onto the holographic recording medium.