Systematic Effects in Strontium Optical Lattice Clocks

In this work, we present an investigation of several systematic effects of two optical lattice clock systems with strontium atoms. We propose a new measurement of the hyperpolarizability of the clock transition, with its dependency with the polarization of the trapping laser. We also propose a method for temperature insensitive measurement of those coefficient, suitable for reproducible experimental condition for a clock operating in the 10
^-18
level. As an outlook, we present the design and characterization of an updated vacuum environment, expected to enable a one order of magnitude reduction of the blackbody radiation shift uncertainty, and more reliable operation of the clock.