Abstract
I consider the influence of different substrate thicknesses on the signal
obtained from an optical disk. Two solutions are presented for the reading of
different disk types. In one situation a substrate thickness change for disks
with equal density is made inoffensive by introduction of a combined
amplitude–phase mask in the pupil of the readout objective. In a second
situation, where the different thickness is accompanied by a change in optical
density, a specific selection in the far field of the detected radiation has
proven to be adequate.
© 1997 Optical Society of America
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