15 Gbit/inch~2 areal density optical disk using the DWDD medium with blue LD recording

摘要

We developed a DWDD (Domain Wall Displacement Detection)~1 medium which was appleid for an optical disk system with a blue laser diode ( lambda = 406 nm) and an objective lens of NA=0.60. The layer structure of the medium was modified by taking into account the thermal characteristicsof the medium during readout with blue laser. The result of jitter measurement suggested that areal density of over 15 Gbit/inch~2 is feasible for the DWDD media with a blue laser.