A mercury optical lattice clock with improved magic wavelength control

We report on the recent improvements of the optical lattice frequency standard at 1.1 PHz based on
¹⁹⁹
Hg operating at LNE-SYRTE. In particular we describe a frequency locking scheme that allows us to trace the frequency of the optical lattice trapping frequency to the SI second down to an accuracy of 100 kHz, pushing the limit of the corresponding term in the clock error budget below 1 × 10
⁻¹⁸
. Furthermore we will detail preliminary results obtained with a pre-cooling stage giving a bright flux of cold mercury atoms. We finally discuss the impact of the mercury clock for present and future optical frequency comparisons.