Abstract
The effects of the substrate birefringence on the readback signal envelope of the magneto-optical disk are studied by a numerical model and model experiments. The envelope modulation of the RF signal amplitude is confirmed to be reduced by several percents by the adjustment of the conditions in the dynamic test. However, a low frequency noise is caused by local variation of the birefringence of the substrate. It is suggested that the conventional birefringence model for a typical plastic substrate might not be sufficient and a new model is proposed.
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