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An optical storage system is described in which direct overwrite of previously recorded data on a phase change medium is accomplished with a single optical beam at reasonable data rates.
English (United States)
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Single Beam Direct Over-Write of Phase Change Media
An optical storage system is described in which direct overwrite of previously
recorded data on a phase change medium is accomplished with a single optical
beam at reasonable data rates.
Data is initially recorded on a phase change medium, such as (TeGe)85
Sn15, using a laser pulse train. To overwrite the previously recorded data, the
laser power is controlled by initially setting the power to a level (see Fig. 1)
sufficient for a "melt" crystallization level. When it is desired to record, the laser
power is rapidly dropped to a low "read" level for a time sufficient to quench in a
small amorphous region 1 (see Fig. 2). The laser power is then increased back
to the "melt" crystallization level until the next amorphous region 2 is desired. The
effect of the rapid decrease in laser power when an amorphous region is desired
is to increase the thermal quench rate at the tracking edge of the beam
sufficiently to permit a portion of the medium to be amorphized.