Premastered Optical Disk by Superresolution

1 November 1993

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 32 (11S)
https://doi.org/10.1143/jjap.32.5210

Abstract

Premastered optical disk by superresolution (PSR) for practical use has been achieved for the first time. The PSR disk has a phase-change material Ge₂Sb₂Te₅ with stoichiometric composition. Superresolution results from a high contrast ratio of reflectance in the light spot between highly reflective crystal region and lowly reflective melted region. A high C/N ratio of 56 dB is obtained at a pit length of 0.4 µm using PSR. The C/N ratio is still as high as 50 dB for a pit length of 0.3 µm. The PSR disk with double linear densities of current CD is successfully read out with a clear eye pattern and a low error rate using current optics.

Keywords

This publication has 2 references indexed in Scilit:

Magnetically induced super resolution in a novel magneto-optical disk
Published by SPIE-Intl Soc Optical Eng ,1991
Optical storage read-out of nonlinear disks
Applied Optics, 1990