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基于光学反馈频率锁定的窄线宽稳定中红外激光产生技术研究

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物理学报 2024年第1期73卷 193-200页

作者：杨家齐赵刚焦康高健闫晓娟赵延霆马维光贾锁堂山西大学量子光学与光量子器件国家重点实验室太原030006 山西大学极端光学协同创新中心太原030006

中红外精密激光光谱技术在痕量气体检测、基本物理常数测定等领域都有重要应用,然而由于缺乏窄线宽、稳定的中红外光源,很难实现中红外精密光谱测量.本文介绍了一种基于光学反馈频率锁定的窄线宽稳定中红外激光产生技术,分析了光学反馈... 详细信息

中红外精密激光光谱技术在痕量气体检测、基本物理常数测定等领域都有重要应用,然而由于缺乏窄线宽、稳定的中红外光源,很难实现中红外精密光谱测量.本文介绍了一种基于光学反馈频率锁定的窄线宽稳定中红外激光产生技术,分析了光学反馈实现激光到F-P腔锁定的可行性,利用一个高精细度中红外超稳F-P腔作为频率参考,基于光学反馈技术实现了量子级联激光器到该超稳腔的锁定.经过评估得到激光器线宽被压窄到1.1 Hz,压窄激光线宽的同时稳定了激光频率,将激光器的长期漂移控制在20 kHz/12 h.其中,为了获取长时间稳定的光学反馈,基于PDH技术获取了误差信号,用于对反馈相位的实时伺服控制.

关键词：激光频率锁定中红外激光线宽压窄光学反馈

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超冷^(85)Rb^(133)Cs分子转动态碰撞特性研究

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量子光学学报 2024年第1期30卷 61-68页

作者：陈一瑶马伟鑫姬中华梅锋赵延霆贾锁堂山西大学激光光谱研究所量子光学与光量子器件国家重点实验室山西太原030006 山西大学极端光学协同创新中心山西太原030006

使用损耗光谱技术测量了直接光缔合制备的X^(1)Σ^(+)(v=0)振动基态超冷^(85)Rb^(133)Cs分子的转动态分布,使用微波脉冲技术操控了超冷^(85)Rb^(133)Cs分子转动态布居转化,对基态超冷^(85)Rb^(133)Cs分子最低振动态上纯转动态和混合转... 详细信息

使用损耗光谱技术测量了直接光缔合制备的X^(1)Σ^(+)(v=0)振动基态超冷^(85)Rb^(133)Cs分子的转动态分布,使用微波脉冲技术操控了超冷^(85)Rb^(133)Cs分子转动态布居转化,对基态超冷^(85)Rb^(133)Cs分子最低振动态上纯转动态和混合转动态的碰撞特性进行了研究。具体地测量了^(85)Rb^(133)Cs分子分别处于X^(1)Σ^(+)(v=0,J=1)转动态、X^(1)Σ^(+)(v=0,J=2)转动态以及这两个转动态形成的混合态这三种情况下的分子布居演化,引入速率方程来描述损耗过程中分子的动力学过程并获得分子非弹性碰撞系数,实验发现转动混合态的碰撞系数高于纯转动态碰撞系数,造成这种差异的原因主要来自于相邻转动态之间的偶极—偶极相互作用。本工作为理解超冷极性分子非弹性碰撞机制、制备低温高密度超冷极性分子提供了重要参考。

关键词：超冷极性分子光缔合转动态非弹性碰撞

SU(3) spin-orbit coupled fermions in an optical lattice

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Chinese Physics B 2022年第1期31卷 504-510页

作者：周晓凡陈刚贾锁堂 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

We propose a scheme to realize the SU(3)spin-orbit coupled three-component fermions in an one-dimensional optical *** topological properties of the single-particle Hamiltonian are studied by calculating the Berry phase,winding number and edge *** also investigate the effects of the interaction on the ground-state topology of the system,and characterize the interaction-induced topological phase transitions,using a state-of-the-art density-matrix renormalization-group numerical ***,we show the typical features of the emerging quantum phases,and map out the many-body phase diagram between the interaction and the Zeeman *** results establish a way for exploring novel quantum physics induced by the SOC with SU(N)symmetry.

关键词： spin-orbit coupling topological phase transition optical lattice

Facile low-temperature supercritical carbonization method to prepare high-loading nickel single atom catalysts for efficient photodegradation of tetracycline

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Journal of Environmental Sciences 2024年第4期138卷 373-384页

作者： Han Qiao Lirong Zheng Shiwen Hu Gang tang Hongri suo Chongxuan Liu School of Environment Harbin Institute of TechnologyHarbin 150090China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Environmental photocatalysis is a promising technology for treating antibiotics in *** this study,a supercritical carbonization method was developed to synthesize a single-atom photocatalyst with a high loading of Ni(above 5 wt.%)anchored on a carbonnitrogen-silicate substrate for the efficient photodegradation of a ubiquitous environmental contaminant of tetracycline(TC).The photocatalyst was prepared from an easily obtained metal-biopolymer-inorganic supramolecular hydrogel,followed by supercritical drying and carbonization *** low-temperature(300℃)supercritical ethanol treatment prevents the excessive structural degradation of hydrogel and greatly reduces the metal clustering and aggregation,which contributed to the high Ni *** characterizations confirmed that Ni was present at isolated sites and stabilized by Ni-N and Ni-O bonds in a Ni-(N/O)_(6)-C/SiC configuration.A 5%Ni-C-Si catalyst,which performed the best among the studied catalysts,exhibited a wide visible light response with a narrow bandgap of 1.45 eV that could efficiently and repeatedly catalyze the oxidation of TC with a conversion rate of almost 100% within 40 *** reactive species trapping experiments and electron spin resonance(ESR)tests demonstrated that the h+,and·O_(2)-were mainly responsible for TC *** TC degradation mechanism and possible reaction pathways were provided ***,this study proposed a novel strategy to synthesize a high metal loading singleatom photocatalyst that can efficiently remove TC with high concentrations,and this strategy might be extended for synthesis of other carbon-based single-atom catalysts with valuable properties.

关键词： Carbon-based single-atom catalyst Nickel Photocatalytic degradation Tetracycline Visible light

Brightγ-ray source with large orbital angular momentum from the laser near-criticalplasma interaction

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Plasma Science and Technology 2022年第9期24卷 15-23页

作者： Mamat Ali BAKE 唐琐谢柏松 Xinjiang Key Laboratory of Solid State Physics and Devices Xinjiang UniversityUrumqi 830046Peopleʼs Republic of China School of Physics Science and Technology Xinjiang UniversityUrumqi 830046Peopleʼs Republic of China Key Laboratory of Beam Technology of the Ministry of Education and College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875Peopleʼs Republic of China College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100Peopleʼs Republic of China

We propose a new laser-plasma-based method to generate brightγ-rays carrying large orbital angular momentum by interacting a circularly polarized Laguerre–Gaussian laser pulse with a near-critical hydrogen plasma conflned in an over-dense solid *** the flrst stage of the interaction,it is found via fully relativistic three-dimensional particle-in-cell simulations that high-energy helical electron beams with large orbital angular momentum are *** the second stage,this electron beam interacts with the laser pulse reflected from the plasma disc behind the solid tube,and helicalγbeams are generated with the same topological structure as the electron *** results show that the electrons receive angular momentum from the drive laser,which can be further transferred to theγphotons during the ***γbeam orbital angular momentum is strongly dependent on the laser topological charge l and laser intensity a_(0),which scales as L_(γ)∝a_(0)~4.A short(duration of 5 fs)isolated helicalγbeam with an angular momentum of-3.3×10^(-14)kg m~2 s^(-1)is generated using the Laguerre–Gaussian laser pulse with l=*** peak brightness of the helicalγbeam reaches 1.22×10^(24)photons s^(-1)mm^(-2)mrad^(-2)per 0.1%BW(at 10 Me V),and the laser-to-γ-ray angular momentum conversion rate is approximately 2.1%.

关键词： laser plasma interaction Laguerre–Gaussian laser γ-ray emission orbital angular momentum particle-in-cell simulation

Electron-positron pair production in ultrastrong laser fields

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Matter and Radiation at Extremes 2017年第5期2卷 225-242页

作者： Bai Song Xie Zi Liang Li suo tang College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China Beijing Radiation Center Beijing 100875China School of Science China University of Mining and TechnologyBeijing 100083China Max-Planck-Institut fur Kernphysik Saupfercheckweg 169117 HeidelbergGermany

Electronepositron pair production due to the decay of vacuum in ultrastrong laser fields is an interesting topic which is revived recently because of the rapid development of current laser *** theoretical and numerical research progress of this challenging topic is *** new findings are presented by different approaches such as the worldline instantons,the S-matrix theory,the kinetic method by solving the quantum Vlasov equation or/and the real-time DiraceHeisenbergeWigner formalism,the computational quantum field theory by solving the Dirac equation and so *** particular,the effects of electric field polarizations on pair production are unveiled with different patterns of created momentum *** effects of polarizations on the number density of created particles and the nonperturbative signatures of multiphoton process are also *** competitive interplay between the multiphoton process and nonperturbation process plays a key role in these new *** newly discovered phenomena are valuable to deepen the understanding of pair production in complex fields and even have an implication to the study of strong-field *** recent studies on the pair production in complex fields as well as beyond laser fields are briefly presented in the view point of perspective future.

关键词： Strong field physics Vacuum pair production Nonlinear quantum electrodynamics

Light-induced frequency shifts for the lowest vibrational levels of ultracold Cs2 in the molecular pure long-range 0^-g state

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Frontiers of physics 2020年第2期15卷 57-62页

作者： Ji-Zhou Wu Yu-Qing Li Wen-Liang Liu Jie Ma Lian-Tuan Xiao suo-tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China

The light-induced frequency shift(LIFS)of ultracold molecular ro-vibrational levels originates from the strong coupling of the atomic-scattering state and the bound-molecular *** this paper,we present our experimental determination of the LIFSs of the lowest vibrational levels(v=0,1)in the purely long-range 0^-g state of ultracold cesium molecules.A high-resolution double photoassociation spectroscopy is developed,which serves as frequency ruler to measure the frequency shifts of the lowest molecular levels for *** experimental results are qualitatively consistent with the theoretical expectations.

关键词： light-induced frequency shift ultracold molecule double photoassociation spectroscopy long-range state

Modification of single molecule fluorescence using external fields

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Frontiers of physics 2017年第5期12卷 11-25页

作者： Rui-Yun Chen Guo-Feng Zhang Cheng-Bin Qin Yan Gao Lian-Tuan Xiao suo-tang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Taiyuan 030006 China Collaborative Innovation Center of Extreme Optics S hanxi University Taiyuan 030006 China

Controlling and manipulating the fluorescence of single fluorophores is of great interest in recent years for its potential uses in improving the performance of molecular photonics and molecular electronics, such as in organic light-emitting devices, single photon sources, organic field-effect transistors, and probes or sensors based on single molecules. This review shows how the fluorescence emission of single organic molecules can be modified using local electromagnetic fields of metallic nanostructures and electric-field-induced electron transfer. Electric-field-induced fluorescence modulation, hysteresis, and the achievement of fluorescence switch are discussed in detail.

关键词： single molecules fluorescence modification external fields

Circulating Lipoproteins Mediate the Association Between Cardiovascular Risk Factors and Cognitive Decline:A Community‑Based Cohort Study

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Phenomics 2024年第1期4卷 51-55页

作者： Jialin Li Qingxia Huang Yingzhe Wang Mei Cui Kelin Xu Chen suo Zhenqiu Liu Yanpeng An Li Jin Huiru tang Xingdong Chen Yanfeng Jiang State Key Laboratory of Genetic Engineering Human Phenome InstituteZhangjiang Fudan International Innovation Centerand National Clinical Research Center for Aging and MedicineHuashan HospitalFudan University2005 Songhu RdShanghai 200438China Fudan University Taizhou Institute of Health Sciences Taizhou 225326China State Key Laboratory of Genetic Engineering School of Life SciencesMetabonomics and Systems Biology Laboratory at Shanghai International Centre for Molecular PhenomicsHuman Phenome InstituteZhongshan HospitalFudan University2005 Songhu RdShanghai 200438China Department of Neurology Huashan HospitalFudan UniversityShanghai 200040China Ministry of Education Key Laboratory of Public Health Safety Department of BiostatisticsSchool of Public HealthFudan UniversityShanghai 200032China Ministry of Education Key Laboratory of Public Health Safety Department of EpidemiologySchool of Public HealthFudan UniversityShanghai 200032China Shanghai Institute of Infectious Disease and Biosecurity Shanghai 200032China Yiwu Research Institute of Fudan University Yiwu 322000ZhejiangChina International Human Phenome Institute(Shanghai) Shanghai 201203China Greater Bay Area Institute of Precision Medicine(Guangzhou) Fudan UniversityGuangzhou 511462China

Cardiovascular health metrics are now widely recognized as modifable risk factors for cognitive decline and *** perturbations might play roles in the linkage of cardiovascular diseases and *** metabolites profling by metabolomics may improve understanding of the potential mechanism by which cardiovascular risk factors contribute to cognitive *** a prospective community-based cohort in China(n=725),312 serum metabolic phenotypes were quantifed,and cardiovascular health score was calculated including smoking,exercise,sleep,diet,body mass index,blood pressure,and blood *** function assessments were conducted in baseline and follow-up visits to identify longitudinal cognitive decline.A better cardiovascular health was signifcantly associated with lower risk of concentration decline and orientation decline(hazard ratio(HR):0.84–0.90;p<0.05).Apolipoprotein-A1,high-density lipoprotein(HDL)cholesterol,cholesterol ester,and phospholipid concentrations were signifcantly associated with a lower risk of longitudinal memory and orientation decline(p<0.05 and adjusted-p<0.20).Mediation analysis suggested that the negative association between health status and the risk of orientation decline was partly mediated by cholesterol ester and total lipids in HDL-2 and-3(proportion of mediation:7.68–8.21%,both p<0.05).Cardiovascular risk factors were associated with greater risks of cognitive decline,which were found to be mediated by circulating lipoproteins,particularly the medium-size HDL *** fndings underscore the potential of utilizing lipoproteins as targets for early stage dementia screening and intervention.

关键词： Cardiovascular risk factors Lipoproteins Lipids Cognition Cognitive decline