Presented By: CM-AMO Seminars
CM-AMO Seminar | Laser-cooled Microwave Atomic Clocks at NIST
Yaroslav Dudin (NIST Boulder)
This talk will provide an overview of the primary frequency standards at NIST. Caesium fountains NIST-F1 and NIST-F2 are employed as national primary frequency standards operating with fractional uncertainties in low 10^-16 range. NIST-F2 is a second-generation standard developed with a cryogenic microwave cavity and flight region. The 80 K atom interrogation environment reduces the uncertainty due to the blackbody radiation shift by more than a factor of 50.
The second part of this talk will introduce our current efforts in developing laser-cooled atomic clocks for the next generation of GPS satellites. The current generation of atomic clocks used in GPS satellites is based on lamp-excited Rb vapor-cell clock techniques that date back 50 years and while the performance is impressive, it is unlikely to be further improved by incremental advances on the already very mature technology. Because the uncertainties of onboard clocks are significant contributors to the overall GPS error budget, there is interest in developing a new generation of robust, small, reliable, and accurate laser-cooled microwave atomic clocks for future generations of the GPS system.
The second part of this talk will introduce our current efforts in developing laser-cooled atomic clocks for the next generation of GPS satellites. The current generation of atomic clocks used in GPS satellites is based on lamp-excited Rb vapor-cell clock techniques that date back 50 years and while the performance is impressive, it is unlikely to be further improved by incremental advances on the already very mature technology. Because the uncertainties of onboard clocks are significant contributors to the overall GPS error budget, there is interest in developing a new generation of robust, small, reliable, and accurate laser-cooled microwave atomic clocks for future generations of the GPS system.
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