Holographic recording apparatus and method for recording holograms
AssigneeSony Corporation
InventorMitsuru Toishi
Life of this patent
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Abstract
A hologram recording apparatus for carrying out holographic recording by emitting a signal beam and a reference beam onto a holographic recording medium includes a laser light source configured to output a pulsed laser beam, a splitter configured to split the laser beam into a signal beam and a reference beam, a spatial light modulator configured to modulate the signal beam or both the signal beam and the reference beam, and a controlling unit configured to control the spatial light modulator to modulate at least one of the signal beam and the reference beam with a totally dark pattern for a predetermined period of time, wherein the predetermined period begins no later than the start of the risetime of a pulse of a laser beam output from the laser light source.
Claims11
A hologram recording apparatus for carrying out holographic recording by emitting a signal beam and a reference beam onto a holographic recording medium, the apparatus comprising:
- a laser light source configured to output a pulsed laser beam;
- splitting means for splitting the laser beam into a signal beam and a reference beam;
- spatial light modulating means for modulating the signal beam or both the signal beam and the reference beam;
- and
- controlling means for controlling the spatial light modulator to modulate at least one of the signal beam and the reference beam with a totally dark pattern for a predetermined period of time, the predetermined period beginning no later than the start of the risetime of a pulse of a laser beam output from the laser light source.
A method for holographic recording, comprising:
- outputting a pulsed laser beam;
- splitting the laser beam into a signal beam and a reference beam;
- modulating the signal beam or both the signal beam and the reference beam and carrying out holographic recording by emitting the signal beam and the reference beam onto a holographic recording medium;
- and
- controlling the modulation so that at least one of the signal beam and the reference beam is modulated with a totally dark pattern for a predetermined period of time, the predetermined period beginning no later than the start of the risetime of a pulse of a laser beam output from the laser light source.
A hologram recording apparatus for carrying out holographic recording by emitting a signal beam and a reference beam onto a holographic recording medium, the apparatus comprising:
- a laser light source configured to output a pulsed laser beam;
- a splitter configured to split the laser beam into a signal beam and a reference beam;
- a spatial light modulator configured to modulate the signal beam or both the signal beam and the reference beam;
- and
- a controlling unit configured to control the spatial light modulator to modulate at least one of the signal beam and the reference beam with a totally dark pattern for a predetermined period of time, the predetermined period beginning no later than the start of the risetime of a pulse of a laser beam output from the laser light source.
Dependencies are inferred from the claim text.