Differential spot-size focus servo

Tomas D. Milster; Mark Shi Wang; Fred Franklin Froehlich; J. L. Kann; Jeffrey P. Treptau; James Kevin Erwin

doi:10.1117/12.45899

1 July 1991 Differential spot-size focus servo

Tomas D. Milster, Mark Shi Wang, Fred Franklin Froehlich, J. L. Kann, Jeffrey P. Treptau, James Kevin Erwin

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45899
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

Abstract

We describe performance of a differential spot-size (wax-wane) focus servo. Cross talk from the tracks are analyzed in the single detector and differential focus circuits. Magnitude of the cross talk is reduced by a factor of three in the differential circuit. A false FES signal is present when the spot crosses sector marks at na angle.

Citation Download Citation

Tomas D. Milster, Mark Shi Wang, Fred Franklin Froehlich, J. L. Kann, Jeffrey P. Treptau, and James Kevin Erwin "Differential spot-size focus servo", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45899

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