Absolute frequency measurement of the 171Yb+ clock transition with a Kerr-lens mode-locked femtosecond laser

Joern Stenger, Christian Tamm, Nils Haverkamp +2

We have measured the frequency of the $6s^2{S}_{1/2}-5d^2{D}_{3/2}$ electric-quadrupole transition of ${}^{171}$Yb${}^{+}$ with a relative uncertainty of $1\times 10^{-14}$, ${\nu }_{Yb}$ = 688…