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More CD Than You'll Ever Need

By Fred Guterl
Jan 1, 1997 6:00 AMNov 12, 2019 5:44 AM


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Paras Prasad, a chemist at the State University of New York at Buffalo, has developed a technology for squeezing a thousand times more data onto a compact disc. Prasad dopes a polymer with a fluorescent dye that emits light when illuminated by a weak laser beam--but when blasted with an intense laser, it loses much of its fluorescence. That means Prasad can write dark bits of information on a disc with a narrowly focused, high- intensity laser and later read them with a weak one. Because he can focus his lasers to a precise depth, he can stack many layers of data onto a single disc.

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