We have determined the fundamental frequency of the cesium atom 6S-6D two-photon transition, for the first time, to our knowledge. Moreover, our high-resolution scheme made it possible to address the influence of the nuclear magnetic octupole on the hyperfine structure. We found that the octupole-interaction hyperfine constant deduced from the cesium 6D-level has a value nearly eight times larger than what has been deduced from the 6P-level.
Glass-cell–based secondary clocks, including coherent population trapping (CPT) clocks, are the most used clocks in modern laboratories and in industry. However, the reported frequency accuracies of those secondary clocks were always much worse than expected, though all error sources have been previously discussed. In this report, a high-precision measurement on the spectral frequency-linewidth relation (FL-R) is first used for revealing a new error source in secondary clocks by which we answer the puzzle raised in Opt. Lett. 38, 3186 (2013)10.1364/OL.38.003186.
We report a new error source for the frequency of glass-cell based secondary time-frequency standards. That is, a frequency shift by helium collision was perceived where the helium atoms were confirmed as from the atmosphere.
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