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NIST-F1, source of the official time of the United States. NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed ...
NIST physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a civilian time standard for the United States. NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard. [1] NIST-F2 was brought online on 3 April 2014. [1] [2]
Download QR code; Print/export ... NIST Boulder Laboratories; Boulder, Colorado ... 18 cesium atomic clocks and 4 hydrogen maser clocks
The heart of NIST's next-generation miniature atomic clock -- ticking at high "optical" frequencies-- is this vapor cell on a chip, shown next to a coffee bean for scale. Conventional vapor cell atomic clocks are about the size of a deck of cards, consume about 10 W of electrical power and cost about $3,000.
Download QR code; Print/export ... Primary frequency and time standards like the United States Time Standard atomic clocks, NIST-F1 and NIST-F2, use far higher power. ...
Download QR code; Print/export ... Pages in category "Atomic clocks" ... NIST-F2; Nuclear clock; P. Primary Atomic Reference Clock in Space; Q.
NIST-7 was the atomic clock used by the United States from 1993 to 1999. It was one of a series of Atomic Clocks [ 1 ] at the National Institute of Standards and Technology . Eventually, it achieved an uncertainty of 5 × 10 −15 .
One of NIST's 2013 pair of ytterbium optical lattice atomic clocks. An ideal atom for use in an optical clock has a narrow electronic transition, often a quadrupole transition referred to as a clock transition, that is accessible by conventional lasers. The atom often also has an electronic structure that is amenable to laser cooling ...