Abstract
Numerical analyses were conducted to simulate the effects of
different Gaussian-weighted beams and disk geometries on the read-out
signal cross talk of land and groove recording of phase-change optical
disk systems. The optimized groove depth, which yields a minimum
cross-talk noise, differs for different Gaussian-weighted beams and
different track pitches. This beam profile dependence of the
optimum groove depth is undesirable for practical application of this
technique, because different optical systems may have different beam
profiles at the lens aperture plane. It is found that this effect
can be reduced to a certain extent by introduction of an appropriate
shading band filter.
© 1999 Optical Society of America
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