Diffraction analysis and evaluation of several focus- And track-error detection schemes for magneto-optical disk systems

Bruce E. Bernacki, M. Mansuripur

Research output: Contribution to journalConference article

6 Scopus citations


A commonly used tracking method on pre-grooved magneto-optical (MO) media is the push-pull technique, and the astigmatic method is a popular focus-error detection approach. These two methods are analyzed using DIFFRACT©, a general-purpose scalar diffraction modeling program, to observe the effects on the error signals due to focusing lens misalignment, Seidel aberrations, and optical crosstalk (feedthrough) between the focusing and tracking servos. Using the results of the astigmatic/push-pull system as a basis for comparison, a novel focus/track-error detection technique that utilizes a ring toric lens is evaluated as well as the obscuration method (focus error detection only).

Original languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jan 1 1992
EventOptical Data Storage Topical Meeting 1992 - San Jose, United States
Duration: Feb 9 1992Feb 14 1992


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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