Investigation of certain diffraction effects in an optical disk

Jang Hoon Yoo, Chul Woo Lee, Dong Ho Shin, Chanda Bartlett, Kit Iu Cheong, J. K. Erwin, M. Mansuripur

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We report certain diffraction effects that are pertinent to the operation of double-layer optical recording media. For simulating cross-talk effects for double layers, the diffraction of light from the out-of-focus layer and the resulting distribution on the in-focus layer are studied by use of computer simulations. The findings are then verified qualitatively by direct measurements. We also describe a technique for analyzing (by computer simulation) the focus-error signal (FES), taking into account the cross talk between two layers, in systems that use the astigmatic method in conjunction with the double-layer disk. The results of our computer simulations of the FES give us a 10% cross-talk contribution to the original signal. The results of the FES evaluation are compared with those measured in an actual disk drive; good agreement between computation and measurement is obtained.

Original languageEnglish (US)
Pages (from-to)9287-9295
Number of pages9
JournalApplied optics
Volume36
Issue number35
DOIs
StatePublished - Dec 10 1997

Keywords

  • Digital versatile disk
  • Double-layer optical disk
  • High-density optical recording

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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