Hologram recording method and hologram recording apparatus
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United States of America Patent
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Dec 11, 2007
Grant Date -
Jan 20, 2005
app pub date -
Feb 23, 2004
filing date -
Jul 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hologram is recorded by irradiating, with a reference light beam, a region corresponding to an intensity distribution of a signal light beam on an optical recording medium. For example, the reference light beam having the intensity distribution which substantially coincides with the intensity distribution of the signal light beam is generated, and only the region which substantially coincides with the region irradiated by the signal light beam (i.e., the signal light beam defocused region) is irradiated with the reference light beam. This enables only the necessary region to be exposed and the regions which need not be exposed not to be exposed. Accordingly, the hologram can be recorded without losing information of the signal light beam and thus high-density recording can be realized.
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