Abstract

We describe a simple method of measuring vertical birefringence over the entire surface of an optical disk substrate. Our design consists of a linearly polarized He-Ne laser (1-2 mW) and a CCD camera interfaced to a computer. The measurement is non-intrusive, easy to set up, and needs only a few seconds to collect the data and plot a map of vertical birefringence over the surface area of the disk. The system described here is potentially useful as a quality-control tool in substrate manufacturing environments.

© 1994 Optical Society of America

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