Progress on a pulsed CPT clock: Reduction of the main noise source contributions

This paper reports on progress on a compact clock based on Coherent Population Trapping (CPT) using caesium vapour cell. The clock is working in a pulsed regime with two orthogonal linear polarizations made by two phase-locked lasers tuned to 895 nm and separated by 9.2 GHz. The short-term frequency stability is mainly limited by the Local Oscillator (LO) noise contribution and the laser relative intensity noise (RIN) at the level of 3.2×10-13 at 1 s. We present in this paper the work done to improve our experimental device by reducing the frequency noise source contributions.