Abstract
The effects of a plastic objective lens’s astigmatism on the
push–pull tracking-error signal (TES) of an optical disk data
storage system were investigated theoretically and
experimentally. Astigmatism of plastic objective lenses arises
commonly from the asymmetric deviation from their designed shape during
the molding process. By carefully studying the aberration
characteristics of the objective lens and including the astigmatism of
the laser diode in the analysis, we can calculate the combined effects
of astigmatism of these two components on the push–pull TES. It is
found, from both the simulations and the experiments, that, by rotation
of the objective lens about the optical axis, the peak-to-peak value of
the push–pull TES varies with the lens’s rotation angle, and a change
as great as 340% in its value was observed in a given optical
pickup.
© 2000 Optical Society of America
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