Absolute frequency measurements of the 6s6p P0 3 -5d6s D1 3 transitions in Yb 170,171,172,173,174,176 by modulation transfer spectroscopy

We provide a measurement of the 6s6pP03-5d6sD13 transition in multiple isotopes of ytterbium (Yb) at 1389 nm. We measure the absolute frequencies of Yb170, Yb171 (1/2-1/2), Yb171 (1/2-3/2), Yb172, Yb173 (5/2-3/2), Yb173 (5/2-5/2), Yb173 (5/2-7/2), Yb174, Yb176 6s6pP03-5d6sD13 transitions with modulation transfer spectroscopy (MTS) in a hollow cathode lamp. High-resolution dispersive signals of the MTS are obtained for all the stable isotopes, except for low-abundance Yb168. The frequencies of these transitions are measured from the beat signals between a stabilized optical frequency comb and the MTS-locked laser, and the systematic shifts therein are corrected. The hyperfine components Yb173 (5/2-5/2) and Yb171 (1/2-3/2) of the 6s6pP03-5d6sD13 transition for Yb173 and Yb171 isotopes overlap to form an overlapped line; we determine their frequencies by a fitting method. The isotope shifts relative to Yb174 are determined as 284.5(20) MHz for Yb170, 121.5(7) MHz for Yb172 and -114.6(6) MHz for Yb176. The hyperfine constants of the 5d6sD13 state are determined as A(Yb171)=-2039.4(7)MHz, A(Yb173)=563.5(2)MHz, and B(Yb173)=336.8(3)MHz.