Frequency control of a lattice laser at 759 nm by referencing to Yb clock transition at 578 nm

We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium(Yb)optical clock.The frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency comb.Although the comb is frequency-stabilized on a rubidium microwave clock,the frequency instability of the 759 nm laser is evaluated at the 10^(-15) level at 1 s averaging time.The frequency of the 759 nm laser is controlled with an uncertainty within 1 Hz by referencing to the Yb clock transition.Such a frequency-controlled 759 nm laser is suitable for Yb optical clocks as the lattice laser.The technique of laser frequency control can be applied to other lasers in optical clocks.