Frequency noise processes in a strontium ion optical clock
Frequency noise processes in a strontium ion optical clock
复制标题
锶离子光学钟中的频率噪声过程
DOI：
10.1088/0953-4075/48/3/035401
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
P. Gill
中科院分区：
文献类型：
--
作者：
G. Barwood;G. Huang;S. King;H. Klein;P. Gill
最近的一个比较的频率的一对光学时钟的基础上674 nm的2S 1/2- 2D 5/2的光学时钟跃迁在88 Sr+强调需要了解的因素影响频率的不稳定性。我们已经建立了统计模型，表明我们的时钟能够达到量子投影噪声极限;对于使用100 ms探测脉冲的时钟，这是103 × 10−15/π τ。然而，这种光学时钟使用具有线性塞曼位移的原子跃迁，这可能导致在存在磁场噪声的情况下稳定性下降。我们表明，这通常会导致增加白色频率噪声，即使在占主导地位的磁场闪烁或随机游走噪声的情况下。通过考虑量子投影和磁场噪声，我们能够解释我们观察到的频率不稳定性。该分析将涉及具有线性塞曼移位的任何光学时钟，其中通过询问成对的组件来实现该移位的消除。此外，实现激光器的自动控制和微动的最小化需要偶尔暂停频率伺服;这只会导致频率稳定性的小劣化。
A recent comparison of the frequencies of a pair of optical clocks based on the 674 nm 2S1/2–2D5/2 optical clock transition in 88Sr+ has highlighted the need to understand factors affecting frequency instability. We have developed statistical models to show that our clock is capable of reaching the quantum projection noise limit; for our clock using 100 ms probe pulses, this is ∼3 × 10−15/√τ. However, this optical clock uses atomic transitions with a linear Zeeman shift, which can lead to a degradation in stability in the presence of magnetic field noise. We show that this generally leads to an increase in white frequency noise, even in cases dominated by magnetic field flicker or random walk noise. By taking into account both the quantum projection and magnetic field noise we are able to explain our observed frequency instabilities. This analysis will relate to any optical clock with a linear Zeeman shift where cancellation of this shift is achieved by interrogating pairs of components. Furthermore, implementing automatic control of lasers and minimization of micromotion requires pausing of the frequency servo occasionally; this leads to only a small degradation of frequency stability.
影响因子：
8.6
作者：
Huntemann, N.;Okhapkin, M.;Peik, E.
通讯作者：
Peik, E.
影响因子：
8.6
作者：
Huntemann, N.;Lipphardt, B.;Yudin, V. I.
通讯作者：
Yudin, V. I.