Effect of beam profile on the cross talk of land and groove recording

Numerical analyses were conducted to simulate the effects of different Gaus sian-weighted beams and disk geometries on the read-out signal cross talk o f land and groove recording of phase-change optical disk systems. The optim ized groove depth, which yields a minimum cross-talk noise, differs for dif ferent Gaussian-weighted beams and different track pitches. This beam profi le dependence of the optimum groove depth is undesirable for practical appl ication of this technique, because different optical systems may have diffe rent 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 shadi ng band filter. (C) 1999 Optical Society of America. OCIS code: 210.4590.