Optical method and system for writing/reading information on a recording medium
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Aug 23, 1995
filing date -
Dec 23, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method, system and recording medium in which the writing of information is achieved by the use of a write beam including the superposition of a first optical beam at a first wavelength and of a second beam at a second wavelength less than the first wavelength. Reading is done by the use of a second optical beam at the second wavelength. The material of the recording medium is a non-linear material exhibiting a recording threshold situated between the maximum of the sum of the energies of the two beams and an energy level situated in the vicinity of the maximum energy of the first beam.
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