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For a long time, one of the main limitations of cesium atomic fountains has been the cold collision frequency shift [2, 7, 10, 11]. By using a method based on a transfer of population by adiabatic passage (AP) [12, 16, 18] allowing to prepare cold atomic samples with a well defined ratio of atomic density as well as atom number we have a better measurement of this effect. By improving the method we...
Atomic fountain frequency standard have the potential to reach a frequency stability of about 10−14τ−1/2, if the interrogation oscillator frequency noise which degrades the stability via the “Dick effect” ([2, 7]) is made negligible. In this aim a Sapphire Cryogenic Oscillator (SCO) is used as very low noise frequency source σy(τ) ≤ 1 – 2 × 10−15 1 s ≪ τ ≪ 1000 s. In this paper, we describe a low...
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