Transfer of Spectral purity to Strontium and Mercury optical lattice clocks

Talk by Christian Ørtoft Bærentsen, LNE-SYRTE, Paris.

The atomic clocks can nowadays go down to a fractional stability in the 1E-16 range at 1 s, with a possibility of reaching the 1E-18 range for longer integration times. Some of the limitations reaching this level are the limited probing time due to decoherence induced by the clock laser and the phase reassembling time (The dick effect). I will present my work at LNE- SYRTE, going towards ultra-stable lasers through transferring the stability from a 1542 nm ultra-stable laser to target metrology frequencies at 698 nm (Strontium) and 1062 nm (Mercury) used to probe the atoms of the clocks. This involves rethinking the construction of the frequency chain, and the installation of a new ultra-stable cavity.