Progress in Brazilian Cesium atomic fountain-BrCsF

The goal of this work is to present new progress in the Brazilian Cesium fountain Br-CsF, which is currently back to operation after improvements in its optical system. The first result of this new stage is the Ramsey fringe showed in Figure 5. The central oscillation has a FWHM of 1.5 Hz with cycle time of 2 s and with signal noise ratio of 200. This fringe was obtained loading ~10
⁹
atoms into a magneto optical trap with loading time of t
_l
= 1.2 s.