NIM4#铯冷原子喷泉钟新一代时间频率基准

NIM4# Cold Cesium Atomic Fountain Clock a Time and Frequency Primary Standard of New Generation

回顾了NIM4 #钟实现 5 μK冷原子云 ,74cm原子喷泉和 0 95Hz线宽Ramsey跃迁实验 ,报道了 9 19GHz微波锁定到铯原子秒定义跃迁 ,频率稳定性达到 (5 - 7)× 10 -15(15 0 0 0s)。目前我们正在进行不确定度评估 ,可望不确定度进入 10 -15量级 ,建立我国新一代时间频率基准装置。

We in this paper review realizations of the 5μK cold atom cloud, 74cm atomic fountain, and Ramsey transition with 0.95Hz linewidth; and report the locking of th 9.19GHz microwave to the time unit, second, definition transition of the Cesium atom with a stability of (5-7)×10 -15 (15000s) on the NIM4# cold atomic fountain clock. Now we are evaluating the uncertainties with the target to establish the new generation time and frequency primary standard, with uncertainty in the order of 10 -15 , of this nation.