Intercombination line frequencies in 171Yb validated with the clock transition

Research output: Contribution to journalArticlepeer-review


We have carried absolute frequency measurements of the (6s2)1S0 - (6s6 p)3P1 transition in 171Yb (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 ∼3 × 10-12 by spectroscopy on the 1S0 - 3P0 (clock) line in laser cooled and trapped 171Yb atoms. From the hyperfine separation between the F = 1/2 and F = 3/2 levels of 3P1, we determine the hyperfine constant to be A(3P1) = 3957833(28) kHz.

Original languageEnglish
Pages (from-to)3932-3940
Number of pages9
JournalApplied Optics
Issue number15
Publication statusPublished - 20 May 2023

Cite this