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 articleRelated content from Photonics MediaArticlesLaser Endomicroscopy Enables Real-time Detection of Lung CancerResearchers at the Abramson Cancer Center at the University of Pennsylvania have developed a method to detect lung cancer at the cellular level in real time during biopsy. 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