Performances and progress of a compact pulsed CPT Cs clock

We report on the development of a compact Cs cell CPT frequency standard operating in the Dicke regime. Combining a double Lambda scheme and a Ramsey interrogation, high contrast fringes whose linewidth depends on the time separating two pulses, are obtained. Compared to the continuous regime, the pulsed interrogation reduces the light shift by a factor 300 and permits to reach frequency stability 10 times better. A frequency stability of 9.10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−13</sup> at 1 s has already been measured.