Acousto-optic modulators for a controlled frequency shift of light beams in optical and microwave cold-atom frequency standards

2019 ◽  
Vol 49 (9) ◽  
pp. 857-862
Author(s):  
V M Epikhin ◽  
V N Baryshev ◽  
S N Slyusarev ◽  
A V Aprelev ◽  
I Yu Blinov
Keyword(s):  
Frequency Shift ◽  
Cold Atom ◽  
Frequency Standards ◽  
Light Beams

scholarly journals Development of a space cold atom clock

2020 ◽  
Vol 7 (12) ◽  
pp. 1828-1836
Author(s):  
Wei Ren ◽  
Tang Li ◽  
Qiuzhi Qu ◽  
Bin Wang ◽  
Lin Li ◽  
...  
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Cold Atoms ◽  
Cold Atom ◽  
Deep Space ◽  
Fundamental Physics ◽  
Time Frequency ◽  
Frequency Standards ◽  
Scientific Experiments ◽  
Primary Frequency

Abstract Atomic clocks with cold atoms play important roles in the field of fundamental physics as well as primary frequency standards. Operating such cold atom clocks in space paves the way for further exploration in fundamental physics, for example dark matter and general relativity. We developed a space cold atom clock (SCAC), which was launched into orbit with the Space Lab TG-2 in 2016. Before it deorbited with TG-2 in 2019, the SCAC had been working continuously for almost 3 years. During the period in orbit, many scientific experiments and engineering tests were performed. In this article, we summarize the principle, development and in-orbit results. These works provide the basis for construction of a space-borne time-frequency system in deep space.

Frequency shift mitigation in a cold-atom CPT clock

2016 ◽  
Author(s):  
Xiaochi Liu ◽  
Eugene Ivanov ◽  
John Kitching ◽  
Elizabeth A. Donley
Keyword(s):  
Frequency Shift ◽  
Cold Atom

scholarly journals Cascaded Microwave Frequency Transfer over 300-km Fiber Link with Instability at the 10−18 Level

2021 ◽  
Vol 13 (11) ◽  
pp. 2182
Author(s):  
Wenxiang Xue ◽  
Wenyu Zhao ◽  
Honglei Quan ◽  
Yan Xing ◽  
Shougang Zhang
Keyword(s):  
Cold Atom ◽  
Microwave Frequency ◽  
Propagation Delay ◽  
Noise Power ◽  
Noise Power Spectral Density ◽  
Frequency Standards ◽  
Power Spectral ◽  
Electronic Phase ◽  
Frequency Transfer ◽  
Cascaded System

Comparing and synchronizing atomic clocks between distant laboratories with ultra-stable frequency transfer are essential procedures in many fields of fundamental and applied science. Existing conventional methods for frequency transfer based on satellite links, however, are insufficient for the requirements of many applications. In order to achieve high-precision microwave frequency transfer over a thousand kilometers of fiber and to construct a fiber-based microwave transfer network, we propose a cascaded system for microwave frequency transfer consisting of three 100-km single-span spooled fiber links using an improved electronic phase compensation scheme. The transfer instability measured for the microwave signal reaches 1.1 × 10−14 at 1 s and 6.8 × 10−18 at 105 s, which agrees with the root-sum-square of each span contribution. It is feasible to extend the length of the fiber-based microwave frequency transfer up to 1200 km using 4 stages of our cascaded system, which is still sufficient to transfer modern cold atom microwave frequency standards. Moreover, the transfer instability of 9.0 × 10−15 at 1 s and 9.0 × 10−18 at 105 s for a 100-MHz signal is achieved. The residual phase noise power spectral density of the 300-km cascaded link measured at 100-MHz is also obtained. The rejection frequency bandwidth of the cascaded link is limited by the propagation delay of one single-span link.

Direct comparison of two cold-atom-based optical frequency standards by using a femtosecond-laser comb

2001 ◽  
Vol 26 (2) ◽  
pp. 102 ◽  
Author(s):  
K. R. Vogel ◽  
S. A. Diddams ◽  
C. W. Oates ◽  
E. A. Curtis ◽  
R. J. Rafac ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Cold Atom ◽  
Optical Frequency ◽  
Frequency Standards

scholarly journals Laser-pumped and laser-cooled atomic clocks for space applications

1998 ◽  
Vol 16 (4) ◽  
pp. 627-639 ◽  
Author(s):  
Walter F. Buell
Keyword(s):  
Cold Atom ◽  
Coherent Population Trapping ◽  
Time Transfer ◽  
Trapped Atoms ◽  
Space Applications ◽  
Vapor Cell ◽  
Frequency Standards ◽  
Laser Pumping ◽  
Population Trapping ◽  
Optically Trapped

Highly stable atomic frequency standards are of increasing importance for a variety of space applications, ranging from communication to navigation and time transfer to tests of fundamental science. We present a discussion of the improvements possible with laser pumping of vapor cell clocks, including applying coherent population trapping (CPT) techniques. We also present our progress toward a cold atom clock based on magneto-optically trapped atoms for space applications.

scholarly journals Investigation of cold atom collision frequency shift measured by rapid adiabatic passage in cesium fountain clock

2020 ◽  
Vol 69 (14) ◽  
pp. 140601
Author(s):  
Yong Guan ◽  
Dan-Dan Liu ◽  
Xin-Liang Wang ◽  
Hui Zhang ◽  
Jun-Ru Shi ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Collision Frequency ◽  
Cold Atom ◽  
Adiabatic Passage ◽  
Atom Collision
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