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New Atomic Clock Uses Femtosecond Laser

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DENVER, Colo., Feb. 19 -- A new all-optical atomic clock is so accurate, its creators theorize it won't lose or gain a second in 4.5 billion years. Using a femtosecond laser to measure time intervals too tiny to be measured in nanoseconds, Scott A. Diddams, a researcher with the National Institute of Standards and Technology in Boulder, and his colleagues said they were able to keep time with greater precision than with existing atomic clocks -- by five orders of magnitude. They discussed improvements in the femtosecond laser technology, and their efforts to make counters for the new optical...Read full article

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    Published: February 2003
    Basic ScienceNews & FeaturesLasers

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