Phase-change recording element for write once applications
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United States of America Patent
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Dec 24, 2002
Grant Date -
Oct 31, 2002
app pub date -
Feb 22, 2001
filing date -
Feb 22, 2001
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Abstract
A WORM optical recording element includes a substrate; an amorphous phase-change recording layer disposed over the substrate; a dielectric layer disposed adjacent to the amorphous phase-change layer; a reflector layer disposed adjacent to the dielectric layer; and wherein the material and the thickness of the layers are selected such that recording can be performed on the optical recording element by using a focused laser beam to form crystalline marks in the phase-change layer using laser pulses with less than 40 nS in duration, the reflectivity of the amorphous phase as measured by a collimated beam is higher than 28% and the contrast of the read-back signal is higher than 0.6, and the second and subsequent writing over previous recording results in at least a 50% increase in read out jitter.
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