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

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 $\sim 3\times 10^{-12}$ 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 $A{(}^3{P}_1)=3957833(28)$ kHz.

arXiv comment10 pages, 9 figures

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Cited by in corpus (2)

• Violation of the equivalence principle induced by oscillating rest mass and transition frequency, and its detection in atom interferometers
• Offset sideband locking to iodine for laser cooling on the ${}^1{\mathrm{S}}_0\to {}^3{\mathrm{P}}_1$ transition of ${}^{171}\mathrm{Yb}$