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Proceedings Paper

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

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 DIFFRACTc, 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).

Paper Details

Date Published: 13 August 1992
PDF: 7 pages
Proc. SPIE 1663, Optical Data Storage, (13 August 1992); doi: 10.1117/12.137536
Show Author Affiliations
Bruce E. Bernacki, Optical Sciences Ctr./Univ. of Arizona (United States)
Masud Mansuripur, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 1663:
Optical Data Storage
Donald B. Carlin; David B. Kay; Alfred A. Franken, Editor(s)

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