Abstract
We describe a method to estimate the heat capacity of the
substrate, the dielectric layer, and the phase-change layer of
phase-change optical recording media as well as the thermal
conductivity of the phase-change layer in its crystalline
state. Measurements were carried out on spinning disks with the
beam of light focused and locked onto the groove track. The method
relies on the identification of the solid-to-liquid phase transition
that occurs in the phase-change layer and takes advantage of the
dependence of thermal diffusion on track velocity and irradiation
time.
© 2002 Optical Society of America
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