Back in 1964 an editorial in Wireless-World lamented the apparent uselessness of the new technology that came to be known as laser, characterizing it as "somewhat limited". Four decades later, lasers are a multi-billion dollar technology, found in everything from supermarket scanners to DVD players-not to mention the fiber-optic cables that have revolutionized telecommunications. But now imaginations are stretched again, this time by the sonic equivalent of lasers. It seems likely that this technology, tentatively called "Saser", may soon be in great demand and may have innumerable applications.

MCQ: 244

Practice

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