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

Bruce E. Bernacki; Masud Mansuripur

doi:10.1117/12.137536

13 August 1992 Diffraction analysis and evaluation of several focus- and track-error detection schemes for magneto-optical disk systems

Bruce E. Bernacki, Masud Mansuripur

Author Affiliations +

Proceedings Volume 1663, Optical Data Storage; (1992) https://doi.org/10.1117/12.137536
Event: Optical Data Storage Topical Meeting, 1992, San Jose, CA, United States

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 DIFFRACT^c, 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).

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Bruce E. Bernacki and Masud Mansuripur "Diffraction analysis and evaluation of several focus- and track-error detection schemes for magneto-optical disk systems", Proc. SPIE 1663, Optical Data Storage, (13 August 1992); https://doi.org/10.1117/12.137536

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