Power-stabilized 3-W blue laser locked to the 420-nm transition in rubidium

Abstract Atomic clocks with higher frequency stability and accuracy than traditional space-borne atomic clocks are the cornerstone of long-term autonomous operation of space-time-frequency systems. We proposed a space cold atoms clock based on an intracavity cooling scheme, which captures cold atoms at the center of a microwave cavity and then executes in situ interactions between the cold atoms and microwaves. As a result of the microgravity environment in space, the cold atoms can interact with the microwaves for a longer time, which aids in realizing a high-precision atomic clock in space. This paper presents the overall design, operational characteristics, and reliability test results of the space atomic clock based on the intracavity cooling scheme designed for the operation onboard the China space station. In addition, the engineering prototype performance of the space cold atoms microwave clock is also presented. The ground test results for the clock show a fractional frequency stability of 1.1 × 10 −12 τ −1/2 reaching 2.5 × 10 −15 at 200,000 s, providing solid technical and data support for its future operation in orbit. 

pdf/cold-atom-microwave-clock-based-on-intracavity-cooling-in-204hpmpg4m.pdf

Cold atom microwave clock based on intracavity cooling in China space station


 This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic state preparation, microwave interrogation, and transition probability detection, are integrated into the cylindrical microwave cavity to achieve a high-performance and compact physics package for the space cold atom clock. We present the detailed design and ground-test results of the cold atom clock physics package in this article, which demonstrates a frequency stability of 1.2 × 10-12 τ-1/2 with a Ramsey linewidth of 12.5 Hz, and a better performance is predicted with a 1 Hz or a narrower Ramsey linewidth in microgravity environment. The miniaturized cold atom clock based on intracavity cooling has great potential for achieving space high-precision time-frequency reference in the future.

Physics Package Based on Intracavity Laser Cooling 87Rb Atoms for Space Cold Atom Microwave Clock

Designing precision measurement of the gravitational Aharonov-Bohm effect in microgravity

在各向同性激光冷却原子实验中,光场分布是影响冷原子分布的重要因素,可以利用真空腔的结构和激光的注入方式的不同来调控腔内的冷原子分布。本文提出了一种扁平形漫反射腔体结构,并对冷却光的不同注入方式和不同尺寸的腔体结构形成的光场分布进行了仿真。仿真结果表明,与自由空间光入射相比,激光由光纤入射能够获得更均匀的准二维分布的光场,因此可以通过调节光纤的入射角度及光纤参数,实现对光场均匀度的优化。此外,随着腔体边长的等比放大,腔内光功率密度呈负指数幂衰减。扁平形漫反射腔形状接近二维,在准二维分布的光场和特殊的扁平形腔体结构的作用下,能够获得呈准二维分布的冷原子,在量子传感及量子精密测量领域具有重要的应用前景。 

准二维各向同性激光冷却的光场仿真

Hunting for exotic bosons with flying quantum sensors in space

Abstract The invention of laser cooling has fundamentally influenced the research frontier of atomic physics and quantum physics, and recently an intense focus has been on the studies of cold atom physics in microgravity environments. Herein, we report the results of our laser cooling experiment in TianGong-2 space lab, which operated for 34 consecutive months in orbit. Over such an extended operation time, the quality of laser cooling did not experience any significant decline, while the properties of laser cooling in orbital microgravity were systematically studied. In particular, we demonstrate magneto-optical trapping and polarization-gradient cooling in orbit and carefully examine their performances. A comparison of the in-orbit and on-ground results indicates that a higher cooling efficiency exists in microgravity, including a smaller loss rate during the trapping and cooling process and lower ultimate temperature of laser-cooled atoms. Our progress has laid the technical foundations for future applications of cold atoms in space missions with operation times of the order of years.

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

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Hunting for exotic bosons with flying quantum sensors in space

Designing precision measurement of the gravitational Aharonov-Bohm effect in microgravity

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab