Abstract

We have determined the fundamental frequency of the cesium atom $6{\mathrm{S}}_{1/2}–6{\mathrm{D}}_{3/2}$ 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.

© 2018 Optical Society of America

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