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Consumer Electronics by S. P. Bali

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TELLURIUM–SELENIUM ALLOYS

One of the new materials for the storage of information is a polycrystalline tellurium-selenium alloy to which small quantities of other alloys (arsenic, for example) are added to give better control of the melting point and the stability of the material. A thin layer of the alloy is applied to a substrate. A narrow laser beam is used to melt this material locally so that holes are created with the same depth as layer. During the readout process, with a less intense laser beam, the presence or absence of holes produces differences in the reflection of laser light. These differences in reflection represent the information in coded form.

The disc with a tellurium–selenium alloy is ideally suitable for use as a storage ...

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