scholarly journals Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

2018 ◽  
Vol 8 (11) ◽  
pp. 2194 ◽  
Author(s):  
Yebing Wang ◽  
Xiaotong Lu ◽  
Benquan Lu ◽  
Dehuan Kong ◽  
Hong Chang
Keyword(s):  
Optical Lattice ◽  
Closed Loop ◽  
Frequency Instability ◽  
Frequency Noise ◽  
Allan Deviation ◽  
Service Center ◽  
Space Applications ◽  
Time Service ◽  
Optical Lattice Clock ◽  
Averaging Time

We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock was realized. A fractional frequency instability of 2.8 × 10−17 was attained for an averaging time of 2000 s. The Allan deviation is found to be 1.6 × 10−15/τ1/2 and is limited mainly by white-frequency-noise. The Landé g-factors of the (5s2)1S0 and (5s5p)3P0 states in 87Sr were measured experimentally; they are important for evaluating the clock’s Zeeman shifts. We also present recent work on the miniaturization of the strontium optical lattice clock for space applications.

Closed-Loop Operation of Optical Lattice Clock at National Time Service Center

2018 ◽  
Author(s):  
Xu Qin-Fang ◽  
Yin Mo-Juan ◽  
Wang Ye-Bing ◽  
Ren Jie ◽  
Guo Yang ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Closed Loop ◽  
Service Center ◽  
Time Service ◽  
Optical Lattice Clock

Development of the strontium optical lattice clock at national time service center

2018 ◽  
Author(s):  
Mojuan Yin ◽  
Qinfang Xu ◽  
Yebing Wang ◽  
Jie Ren ◽  
Yang Guo ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Service Center ◽  
Time Service ◽  
Optical Lattice Clock

Strontium optical lattice clock at the National Time Service Center

2018 ◽  
Vol 27 (2) ◽  
pp. 023701 ◽  
Author(s):  
Ye-Bing Wang ◽  
Mo-Juan Yin ◽  
Jie Ren ◽  
Qin-Fang Xu ◽  
Ben-Quan Lu ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Service Center ◽  
Time Service ◽  
Optical Lattice Clock

scholarly journals An Evaluation of the Zeeman Shift of the 87Sr Optical Lattice Clock at the National Time Service Center

2020 ◽  
Vol 10 (4) ◽  
pp. 1440 ◽  
Author(s):  
Xiaotong Lu ◽  
Mojuan Yin ◽  
Ting Li ◽  
Yebing Wang ◽  
Hong Chang
Keyword(s):  
Magnetic Field ◽  
Optical Lattice ◽  
Average Frequency ◽  
Service Center ◽  
Time Service ◽  
First Order ◽  
Zeeman Shift ◽  
Frequency Correction ◽  
Overall Evaluation ◽  
Optical Lattice Clock

The Zeeman shift plays an important role in the evaluation of optical lattice clocks since a strong bias magnetic field is applied for departing Zeeman sublevels and defining a quantization axis. We demonstrated the frequency correction and uncertainty evaluation due to Zeeman shift in the 87Sr optical lattice clock at the National Time Service Center. The first-order Zeeman shift was almost completely removed by stabilizing the clock laser to the average frequency of the two Zeeman components of mF = ±9/2. The residual first-order Zeeman shift arose from the magnetic field drift between measurements of the two stretched-state center frequencies; the upper bound was inferred as 4(5) × 10−18. The quadratic Zeeman shift coefficient was experimentally determined as –23.0(4) MHz/T2 and the final Zeeman shift was evaluated as 9.20(7) × 10−17. The evaluation of the Zeeman shift is a foundation for overall evaluation of the uncertainty of an optical lattice clock. This measurement can provide more references for the determination of the quadratic coefficient of 87Sr.

A transportable optical lattice clock at the National Time Service Center

2020 ◽  
Vol 29 (7) ◽  
pp. 070602 ◽  
Author(s):  
De-Huan Kong ◽  
Zhi-Hui Wang ◽  
Feng Guo ◽  
Qiang Zhang ◽  
Xiao-Tong Lu ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Service Center ◽  
Time Service ◽  
Optical Lattice Clock

scholarly journals A Fermi-degenerate three-dimensional optical lattice clock

Science ◽  
2017 ◽  
Vol 358 (6359) ◽  
pp. 90-94 ◽  
Author(s):  
S. L. Campbell ◽  
R. B. Hutson ◽  
G. E. Marti ◽  
A. Goban ◽  
N. Darkwah Oppong ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Three Dimensional ◽  
Measurement Precision ◽  
Frequency Shifts ◽  
Degenerate Fermi Gas ◽  
Atomic Interactions ◽  
Optical Lattice Clock ◽  
Clock Stability ◽  
Averaging Time ◽  
Clock Comparison

Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor of 4 × 1017. Previously, atomic interactions have forced a compromise between clock stability, which benefits from a large number of atoms, and accuracy, which suffers from density-dependent frequency shifts. Here we demonstrate a scalable solution that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts. We show that contact interactions are resolved so that their contribution to clock shifts is orders of magnitude lower than in previous experiments. A synchronous clock comparison between two regions of the 3D lattice yields a measurement precision of 5 × 10–19 in 1 hour of averaging time.

Realization of Closed-Loop Operation of Optical Lattice Clock Based on 171 Yb

2017 ◽  
Vol 34 (2) ◽  
pp. 020601
Author(s):  
Hui Liu ◽  
Xi Zhang ◽  
Kun-Liang Jiang ◽  
Jin-Qi Wang ◽  
Qiang Zhu ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Closed Loop ◽  
Optical Lattice Clock

scholarly journals Spin–orbit-coupled fermions in an optical lattice clock

Nature ◽  
2016 ◽  
Vol 542 (7639) ◽  
pp. 66-70 ◽  
Author(s):  
S. Kolkowitz ◽  
S. L. Bromley ◽  
T. Bothwell ◽  
M. L. Wall ◽  
G. E. Marti ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Spin Orbit ◽  
Optical Lattice Clock

scholarly journals A pulsed-Laser Rb atomic frequency standard for GNSS applications

GPS Solutions ◽  
2021 ◽  
Vol 25 (3) ◽  
Author(s):  
S. Micalizio ◽  
F. Levi ◽  
C. E. Calosso ◽  
M. Gozzelino ◽  
A. Godone
Keyword(s):  
Optical Pumping ◽  
Frequency Standard ◽  
Frequency Stability ◽  
Allan Deviation ◽  
Rubidium Vapor ◽  
Vapor Cell ◽  
Continuous Regime ◽  
Remarkable Result ◽  
Averaging Time ◽  
Consequent Improvement

AbstractWe present the results of 10 years of research related to the development of a Rubidium vapor cell clock based on the principle of pulsed optical pumping (POP). Since in the pulsed approach, the clock operation phases take place at different times, this technique demonstrated to be very effective in curing several issues affecting traditional Rb clocks working in a continuous regime, like light shift, with a consequent improvement of the frequency stability performances. We describe two laboratory prototypes of POP clock, both developed at INRIM. The first one achieved the best results in terms of frequency stability: an Allan deviation of σy(τ) = 1.7 × 10−13 τ−1/2, being τ the averaging time, has been measured. In the prospect of a space application, we show preliminary results obtained with a second more recent prototype based on a loaded cavity-cell arrangement. This clock has a reduced size and exhibited an Allan deviation of σy(τ) = 6 × 10−13 τ−1/2, still a remarkable result for a vapor cell device. In parallel, an ongoing activity performed in collaboration with Leonardo S.p.A. and aimed at developing an engineered space prototype of the POP clock is finally mentioned. Possible issues related to space implementation are also briefly discussed. On the basis of the achieved results, the POP clock represents a promising technology for future GNSSs.

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