Abstract
Analytic and experimental results are presented to demonstrate the advantages of using a cw preheat spot in conjunction with a larger write spot in an optical disc recording system. When compared with conventional single spot writing, the use of preheat allows smaller holes to be recorded while requiring up to 50% less power from the write source. Results are presented for a preheat-to-write-spot ratio that assumes a He-Cd laser preheat source and semiconductor laser write source. An increase in packing density of almost a factor of 2 and an increase in bandwidth of 15% are demonstrated.
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