Techniques for writing and reading data on an optical disk which include formation of holographic optical gratings in plural locations on the optical disk
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United States of America Patent
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May 24, 2005
Grant Date -
Feb 7, 2002
app pub date -
Aug 7, 2001
filing date -
Jul 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical memory for storing and/or reading data on an optical disk. The optical disk incorporates a material in which holographic gratings can be created, and subsequently detected, at plural locations within the disk by an electro-optical head. Creation and detection of holographic gratings with variable diffraction efficiency is possible with the electro-optical head. Multiple holographic gratings can also be created at each one of the plural locations via a beam of light which has a different wavelength or point of focus. These data elements can be read by the electro-optical head using a beam of light sequentially varied in wavelength or point of focus to correspond to the multiple holographic gratings to be recorded.
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