Evaluation of the frequency instability limited by Dick effect in the microwave Hg-199(+) trapped-ion clock
Evaluation of the frequency instability limited by Dick effect in the microwave Hg-199(+) trapped-ion clock
复制标题
微波 Hg-199( ) 俘获离子钟中受迪克效应限制的频率不稳定性评估
DOI：
10.1088/1674-1056/25/12/120601
复制
发表时间：
2016
影响因子：
1.7
通讯作者：
Li Jiao Mei
中科院分区：
文献类型：
--
作者：
Chen Yi He;She Lei;Wang Man;Yang Zhi Hui;Liu Hao;Li Jiao Mei
在微波199 Hg ~+俘获离子钟中，由于周期性的询问场，Dick效应引起的频率不稳定性下降是不可避免的。本文导出了Nπ脉冲（N为奇数）询问场频率起伏的灵敏度函数g（t）的一般表达式。根据40.5GHz微波合成器的相位噪声测量结果，计算了199 Hg ~+离子钟的迪克效应限制的Allan偏差。结果表明，在本实验条件下，线性离子阱和两段扩展线性离子阱的极限Allan偏差分别约为和。
In the microwave 199 Hg+ trapped-ion clock, the frequency instability degradation caused by the Dick effect is unavoidable because of the periodical interrogating field. In this paper, the general expression of the sensitivity function g (t) to the frequency fluctuation of the interrogating field with Nπ-pulse (N is odd) is derived. According to the measured phase noise of the 40.5-GHz microwave synthesizer, the Dick-effect limited Allan deviation of our 199 Hg+ trapped-ion clock is worked out. The results indicate that the limited Allan deviations are about and respectively in the linear ion trap and in the two-segment extended linear ion trap under our present experimental parameters.