NASA NTRS · 19920005691
Differential spot-size focus servo
Abstract
We describe performance of a differential spot-size (wax-wane) focus servo. Crosstalk from the tracks are analyzed in the single detector and differential focus circuits. Magnitude of the crosstalk is reduced by a factor of three in the differential circuit. A false focus-error signal (FES) is present when the spot crosses sector marks at an angle.
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Milster, T. D., Wang, M. S., Froehlich, F. F., Kann, J. L., Treptau, J. P., Erwin, K. E.. 1991-03-15. Differential spot-size focus servo. https://ntrs.nasa.gov/citations/19920005691
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