Abstract

We have carried absolute frequency measurements of the $(6{s^2}){^1}{\!S_0} - (6s6p){^3}{\!P_1}$ transition in $^{171}{\rm Yb}$ (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 time scale 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 $^{171}{\rm Yb}$ 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 $A{(^3}{\!P_1}) = 3 957 833 (28) \;{\rm kHz}$.

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