AIST:实现了网格时钟的高工作速率运行:持续了半个世纪

AIST:实现了网格时钟的高工作速率运行:持续了半个世纪

ー171 Yb光学晶格钟半年ー

-我们报告了171Yb光学晶格时钟的长期运行-

AIST:

我们已经开发了世界上最稳定的网格时钟和频率标准。

发展概况:

最新开发的激光频率/反馈技术可实现无人操作的网格时钟
在185天的光纤时钟中达到80%或更高的高运行率运行
持续高利用率,为国际原子时代做出贡献,旨在重新定义“秒”
AIST:横滨国立大学

在世界范围内,我们首次实现了“长期稳定的光学时钟运行率”。

频率自动重锁功能:

常规地,在光栅时钟的操作中,“用于重启中断装置的负责人必须在实验室中”。

这次,我们新开发了激光频率自动重锁技术。

具有频率自动重锁功能
不中断激光频率控制
无人驾驶成为可能。
也可以从实验室外部远程监视光纤光栅时钟的状态。

如果光纤光栅时钟出现问题,将发送一封自动邮件通知您异常情况。

电网时钟无人操作:

通过将其引入频率稳定系统中,可以实现无人操作的电网时钟。

从2019年10月到2020年3月的半年内,达到了80%以上的高入住率。

该技术的详细信息将在学术期刊Metrologia中发布,该期刊将于2020年11月2日(世界协议时间)出版。
https://www.aist.go.jp/aist_j/press_release/pr2020/pr20201103/pr20201103.html

the nearly continuous operation of an 171Yb optical lattice clock for half a year

Abstract

Optical lattice clocks
surpass primary Cs microwave clocks in frequency stability and accuracy, and are promising candidates for a redefinition of the second in the International System of Units (SI).

However,
the robustness of optical lattice clocks

has not yet reached a level comparable to that of Cs fountain clocks which contribute to International Atomic Time (TAI) by the nearly continuous operation.

In this paper,
we report the long-term operation of an 171Yb optical lattice clock

with a coverage of 80.3% for half a year including uptimes of 93.9% for the first 24 days and 92.6% for the last 35 days.

This enables a nearly dead-time-free frequency comparison of the optical lattice clock with TAI over months,

which provides a link to the SI second with an uncertainty of low 10−16.

By using this link,
the absolute frequency of the 1S$_{0}-^{3}$P0 clock transition of 171Yb

is measured as 518 295 836 590 863.54(26) Hz with a fractional uncertainty of 5.0 × 10−16.

This value is in agreement with the recommended frequency of 171Yb as a secondary representation of the second.

IOPscience

https://iopscience.iop.org/article/10.1088/1681-7575/ab9f1f