| 摘要 |
A hologram recorder (A 2 ) includes: a light source ( 10 ) for emitting a coherent beam; a spatial light modulator ( 20 ) provided with unit areas having a plurality of beam reflection elements ( 21 ) to reflect the beam from the light source ( 10 ) in a main direction as a signal beam or a cut-off direction; and a signal beam optical system ( 30, 31 ) for directing the signal beam to the hologram recording medium B. The recorder (A 2 ) further includes: a wavefront reshaper ( 40, 41, 42 ) for condensing the beams thinned out in the cut-off direction by the beam reflection element ( 21 ) of the modulator ( 20 ), and reshaping the wavefront of the condensed beams; and a reference beam optical system ( 50, 51 ) for directing the beam from the reshaper ( 40, 41, 42 ) to the recording medium (B) as a reference beam to be shone in an overlapping manner with the signal beam.
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