Abstract
A simple analytical model with three fitting parameters could simulate the thermal diffusion of scanned and focused laser power on a direct overwrite (DOW) magneto-optical (MO) disk. Three different experiments on the disk give the three fitting parameter values. The thin film structure of the DOW-MO disk has no aluminum layer which current MO disks have, so that the total thermal diffusivity of DOW-MO disks is less than that of the current MO disk. However, the thermal response functions of DOW-MO disks and the current MO disk are not greatly different. Accordingly, as well as the current MO disk, the DOW-MO disk is suitable for high data density recording using the technique of thermal interference uniforming (TIU) to make uniform mark edge shifts. Without TIU, the shifts of edges would depend on the pattern of recorded data.
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