NIST develops phase-modulation servos for atomic clocks. (News Briefs).
The concept was initially developed to address the vibration sensitivity of the laser-cooled clock on the Primary Atomic Reference Clock in Space. In this collaborative program, involving NIST, JPL, the University of Colorado, and the Harvard-Smithsonian Center for Astrophysics, a laser-cooled cesium clock will be put aboard the International Space Station in 2005 to perform certain tests on gravitational theory and to improve upon the realization of the second. The modulation concept was tested on the NIST cesium fountain clock, NIST-F1, and found to work so well that it has become the preferred mode of operation. It has also been picked up by others and is being used on other fountain clocks around the world.
CONTACTS: Tom Parker, (303) 497-7881; tparker @boulder.nist.gov.
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|Title Annotation:||National Institute of Standards & Technology|
|Publication:||Journal of Research of the National Institute of Standards and Technology|
|Article Type:||Brief Article|
|Date:||Sep 1, 2001|
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