Multi-Wavelength Read-Out for Double Layered Mo Disk

Abstract

-We proposed the multi-wavelength read-out (MWR) method for achieving both high signal to noise ratio and large memory density of MO recording. The double MO layered disk was optimized for MWR and fabricated by sputtering. Recorded data were reproduced by using lasers of 680 and 780 nm in wavelength. It was proved that the recorded data for each MO layer were independently deduced by using MWR method without changing a optical focus point.