Engineering and the Advancement of Human Welfare 10 Outstanding Achievements 1964-1989 (1989) / Chapter Skim
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Lasers
Lasers
Pages 34-37
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From page 34... ...
Today lasers play music, read price tags, carry phone calls, cut cloth, perform surgery, and test the quality of air. And although the military is still waiting for a light-ray weapon, lasers have become standard research tools for scientists and engineers in laboratories around the world.
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From page 35... ...
Lasers also vaporize brain tumors, perform delicate inner-ear surgery, and remove warts and gynecological cysts. Laser light goes inside the body through fiber-optic endoscopes to burn fatty deposits out of clogged arteries, pulverize kidney stones, stanch bleeding stomach ulcers, and open blocked fallopian tubes.
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From page 36... ...
A similar frequency shift causes a train whistle to sound higher lo while a train approaches and lower as it speeds away. Another system, called differential absorption lidar, uses laser beams at two I frequencies to detect the presence of a gas in the atmosphere and measure whatever is there.
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From page 37... ...
They are being tested for activating toxic anticancer drugs that accumulate in tumors but pass through the rest of the body. And lasers are being used experimentally for drilling new blood channels in weakened hearts and for other techniques aimed at reducing heart disease, the leading cause of death in the United States.
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