We present experimental work for improved atom loading in the optical molasses of a cesium fountain clock, employing a low-velocity intense source of atoms [Lu et al., Phys. Rev. Lett 77, 3331 (1996)], which we modify by adding a dark-state pump laser. With this modification the atom source has a mean flux of 4 x 10(8) atoms/s at a mean atom velocity of 8.6 m/s. Compared to fountain operation using background gas loading, we achieve a significant increase of the loaded and detected atom number by a factor of 40. Operating the fountain clock with a total number of detected atoms Nat = 2.9 x 10(6) in the quantum projection noise-limited regime, a frequency instability sy (1s) = 2.7 x 10(-14) is demonstrated.
展开▼
机译：我们目前的实验工作是利用低速强原子源来改善铯喷泉钟的光学糖蜜中的原子负载[Lu et al。，Phys。 Rev. Lett 77，3331（1996）]，我们通过添加暗态泵浦激光器对其进行了修改。通过这种修改，原子源在8.6 m / s的平均原子速度下具有4 x 10（8）原子/ s的平均通量。与使用背景气体加载的喷泉操作相比，我们将加载和检测到的原子数显着增加了40倍。以在量子投影中检测到的原子总数Nat = 2.9 x 10（6）来运行喷泉时钟噪声限制机制，证明了频率不稳定性sy（1s）= 2.7 x 10（-14）。
展开▼
