| 摘要 |
A hologram recorder A 1 includes a light source ( 1 ) of a coherent light beam and a spatial light modulator ( 5 A) for modulating a part of the light beam from the light source ( 1 ) into a recording beam which carries two-dimensional information. Another part of the light beam is used as a reference beam to interfere with the recording beam. The recording beam and the reference beam are directed to a hologram recording medium (B). A semi-translucent optical device ( 4 ) is disposed between the light source ( 1 ) and the spatial light modulator (SA) for letting a part of the beam travel to the spatial light modulator ( 5 A) as a transmitted beam while letting another part of the beam travel to the hologram recording medium (B) as a reflected beam. The recording beam and the reference beam, after being separated from each other by the optical device ( 4 ) as the transmitted beam and the reflected beam, travel along the same optical path (L) to irradiate the hologram recording medium (B).
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