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arXiv · 2303.08421

Intercombination line frequencies in $^{171}$Yb validated with the clock transition

Daniel M. Jones·Frank van Kann·John J. McFerran
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Abstract

We have carried absolute frequency measurements of the $(6s^{2})\,^{1}S_{0}$ $-$ $(6s6p)\,^{3}P_{1}$ transition in $^{171}$Yb (the intercombination line), where the spin-1/2 isotope yields two hyperfine lines. The measurements rely on sub-Doppler spectroscopy to yield a discriminator to which a 556 nm laser is locked. The frequency reference for the optical frequency measurements is a high-quality quartz oscillator steered to the GNSS timescale that is bridged with a frequency comb. The reference is validated to $\sim3\times10^{-12}$ by spectroscopy on the $^{1}S_{0}-\,^{3}P_{0}$ (clock) line in laser cooled and trapped $^{171}$Yb atoms. From the hyperfine separation between the $F=1/2$ and $F=3/2$ levels of $^{3}P_{1}$ we determine the hyperfine constant to be $A(^3P_1)= 3\,957\,833\,(28)$ kHz.

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Daniel M. Jones, Frank van Kann, John J. McFerran. 2023-03-15. Intercombination line frequencies in $^{171}$Yb validated with the clock transition. https://doi.org/10.1364/ao.488653

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