Hologram recorder
AssigneeFujitsu Limited
InventorsHiroyasu Yoshikawa, Kouichi Tezuka, Kazushi Uno
Life of this patent
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Abstract
A hologram recorder is provided for recording a hologram on a hologram recording medium by interference of a recording beam with a reference beam. The recorder includes a light source for outputting coherent light to be split into the recording beam and the reference beam; a spatial light modulator for modulating the recording beam into a form representing information to be recorded; an objective lens for outputting the recording beam; and a phase shift mask provided at a light entering surface of the spatial light modulator. The mask is configured to allow the recording beam to pass through, and also to partially shift the phase of the recording beam passing through the mask.
Claims4
A hologram recorder for recording a hologram on a hologram recording medium by interference of a recording beam with a reference beam, comprising:
- a light source for outputting coherent light to be split into the recording beam and the reference beam;
- a spatial light modulator for modulating the recording beam into a form representing information to be recorded;
- an objective lens for outputting the recording beam;
- and
- a phase shift mask provided at a light entering surface of the spatial light modulator, the mask allowing the recording beam to pass through, while also partially shifting a phase of the recording beam passing through the mask.
Dependencies are inferred from the claim text.