A5013420604- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Advanced Photocatalysis Techniques
- Quantum optics and atomic interactions
- Advanced oxidation water treatment
- Quantum Information and Cryptography
- Nuclear reactor physics and engineering
- Spectroscopy and Laser Applications
- Scientific Measurement and Uncertainty Evaluation
- TiO2 Photocatalysis and Solar Cells
- Quantum, superfluid, helium dynamics
- Photonic and Optical Devices
- Gaussian Processes and Bayesian Inference
- Electrocatalysts for Energy Conversion
- 2D Materials and Applications
- Satellite Communication Systems
- Machine Learning in Materials Science
- Advanced Thermodynamics and Statistical Mechanics
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Covalent Organic Framework Applications
- Solar-Powered Water Purification Methods
- Mechanical and Optical Resonators
National University of Defense Technology
2019-2025
Lanzhou University
2023-2025
Beijing Academy of Quantum Information Sciences
2024
University of Birmingham
2014-2020
A metasurface optical chip allows the generation of cold atoms with a single-beam magneto-optical trap (MOT) system.
The high precision and scalable technology offered by atom interferometry has the opportunity to profoundly affect gravity surveys, enabling detection of features either smaller size or greater depth. While such systems are already starting enter into commercial market, significant reductions required in order reach size, weight power conventional devices. In this article, potential for based gravimetry is assessed, suggesting that key resides within development gradiometry sensors enable...
The single-beam magneto-optical trap (MOT) based on the diffractive optical element offers a new route to develop compact cold atom sources. However, efficiency in previous MOT systems is usually low and unbalanced, which will affect quality of trapped atoms. To solve this issue, we developed centimeter-scale dielectric metasurface chip with dynamic phase distributions, was used split single incident laser beam into five separate ones well-defined polarization states uniform energy...
We propose and demonstrate a novel, to the best of our knowledge, scheme for atom interferometry along direction deviating an angle from gravity, using slender light pulses that nest around blue-detuned guiding optical potential (BDGOP). Cold atoms could be uniformly transported through interacted coherently by pulses. analyze coherence cold in BDGOP Ramsey interference. In comparison free-falling interferometry, rapid exponential decay fringe contrast is changed slower linear when subjected...
A frequency doubled I/Q modulator based optical single-sideband (OSSB) laser system is demonstrated for atomic physics research, specifically atom interferometry where the presence of additional sidebands causes parasitic transitions. The performance OSSB technique and spectrum after second harmonic generation are measured analyzed. removed with better than 20 dB suppression, influence transitions upon stimulated Raman at varying spatial positions shown to be beneath experimental noise. This...
This paper reports on a detailed performance characterization of recently developed optical single-sideband (OSSB) laser system based an IQ modulator and second-harmonic generation for rubidium atom interferometry experiments. The measured is used to evaluate the noise contributions this OSSB when it applied drive stimulated Raman transitions in $^{87}$Rb precision measurements gravitational acceleration. suppresses unwanted sideband components, but additional phase shift compensation needs...
Low-phase-noise and pure-spectrum Raman light is vital for high-precision atom interferometry by two-photon transition. A preferred prevalent solution generation electro-optic phase modulation. However, modulation inherently brings in double sidebands, resulting residual sideband effects of multiple laser pairs beside interferometry. Based on a well-designed rectangular fiber Bragg grating plain modulator, optical single-sideband has been realized at 1560 nm with stable suppression ratio...
This paper reports on an experimental realization of automatic laser locking scheme using the artificial intelligence algorithm. We design a classifier based support vector machine to recognize pattern saturated absorption spectroscopy signal and locate its lockable points. experimentally investigated our intelligent external-cavity-diode-laser (ECDL) at 780 nm through rubidium (Rb) cell Rb lines. Test results show that frequency can be automatically locked or relocked desired point within...
The design, fabrication, and demonstration of a planar two-dimensional-crossed reflective diffractive grating are proposed to construct novel optical configuration, the best our knowledge, potentially applied for atom cooling trapping in magneto-optical trap. Based on single-beam single-exposure scheme by means an orthogonal two-axis Lloyd's mirrors interferometer, we rapidly patterned ∼1µm period capable providing uniform intensity diffracted beams. key structural parameters including array...
A novel synthesis method of a Cu single-atom catalyst and study on the application potential for degradation methylene blue.
Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atoms. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...
Laser power stabilization plays a significant role in atomic and molecular physics, quantum precision measurement, optical sensing measurement. In the classical method of using feedback control loop to stabilize laser power, beam splitter is conjunction element connect inside output outside loop. The stability its split ratio will directly affect result stabilization, especially demand high ratios for high-efficiency output. For compatibility power-stabilized system, we designed manufactured...
A breakthrough in cold atom quantum technology is hindered by a bottleneck the supporting technologies. We discuss platform developed within European iSense project, aiming at gravimeter as demonstrator.
Single frequency fiber lasers (SFFLs) have seen increasing applications in state-of-the-art quantum technologies, which usually require precise and stable offset locking (OFL). However, limited by the piezoelectric transducer bandwidth SFFLs loop of OFL, large-gap jumping between two locked frequencies will take an undesirable amount time. In order to diminish that consuming time, we developed agile system based on a hybrid feed-forward path feedback path. accordance with experimental...
The state preparation is a crucial procedure in atom interferometry; however, there shortage of detailed experimental studies on determining the optimal method for achieving this. This paper investigates and compares two methods preparation: combined use microwave Raman light (M-R) optical pumping, microwave, (O-M-W). results demonstrate that M-R improves efficiency transitions interference, which helpful enhancing contrast interference fringes. O-M-R increases quantity prepared atoms,...
Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atom. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...
Abstract Two Sr optical lattice clocks are being built at the National Institute of Metrology China (NIM). Sr1 was on NIM’s Hepingli Campus. It first evaluated in 2015 and improved later on. In 2021, systematic shift uncertainty to be 2.9 × 10 −17 . Sr2 started Changping Campus 2017. The 7.2 −18 2022. With a new BBR optimizing process, total is reduced 4.6 which corresponds 6.5 2023. To compare these two clocks, an frequency transfer fiber link with length 54 km established between clocks. A...
In recent years, the propagation delay in optical transmission systems has received increasing attention. Including precise time synchronization protocol, optically controlled distributed coherent radar and other technical fields. The traditional domain reflectometer (OTDR) measures of fibers from a single end, using several nanosecond pulses with measurement accuracy same magnitude. Meanwhile, as an ultrafast pulse light source multiple equidistant modes, frequency combs have shown...
We propose and demonstrate a novel scheme for vector atom interferometry, using slender light pulses that nests around blue-detuned guiding optical potential (BDGOP). The cold atoms could be uniformly transported through interacted coherently by pulses. analyze the coherence of in BDGOP Ramsey interference. In comparison to free-falling rapid exponential decay fringe contrast is changed slower linear when subjected tilting angle. enhanced approximately fourfold BDGOP. Our work paves way...