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260 fs,403 W coherently combined fiber laser with precise high‑order dispersion management

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Frontiers of Optoelectronics 2024年第1期17卷 21-27页

作者： Shuangxi Peng Zhihao Wang Feilong Hu Zhengyan li Qingbin Zhang peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China

An ultrafast fiber laser system comprising two coherently combined amplifier channels is reported.Within this system,each channel incorporates a rod-type fiber power amplifier,with individual operations reaching approximately 233 W.The active-locking of these coherently combined channels,followed by compression using gratings,yields an output with a pulse energy of 504μJ and an average power of 403 W.Exceptional stability is maintained,with a 0.3%root mean square(RMS)deviation and a beam quality factor M^(2)light effectively compensates for the accumulated high-order dispersion in subsequent amplification stages.This strategic approach results in a significant reduction in the final output pulse duration for the coherently combined laser beam,reducing it from 488 to 260 fs after the gratings compressor,while concurrently enhancing the energy of the primary peak from 65%to 92%.

关键词： Fiber lasers amplifier Power scaling Coherent beam combination Dispersion compensation

Activation of immune signals during organ transplantation

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Signal Transduction and Targeted Therapy 2023年第4期8卷 1545-1570页

作者： Qingwen li peixiang Lan Institute of Organ Transplantation Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Key Laboratory of Organ Transplantation Ministry of EducationNHC Key Laboratory of Organ TransplantationKey Laboratory of Organ TransplantationChinese Academy of Medical SciencesWuhanChina

The activation of host’s innate and adaptive immune systems can lead to acute and chronic graft rejection,which seriously impacts graft survival.Thus,it is particularly significant to clarify the immune signals,which are critical to the initiation and maintenance of rejection generated after transplantation.The initiation of response to graft is dependent on sensing of danger and stranger molecules.The ischemia and reperfusion of grafts lead to cell stress or death,followed by releasing a variety of damage-associated molecular patterns(DAMPs),which are recognized by pattern recognition receptors(PRRs)of host immune cells to activate intracellular immune signals and induce sterile inflammation.In addition to DAMPs,the graft exposed to‘non-self’antigens(stranger molecules)are recognized by the host immune system,stimulating a more intense immune response and further aggravating the graft damage.The polymorphism of MHC genes between different individuals is the key for host or donor immune cells to identify heterologous‘non-self’components in allogeneic and xenogeneic organ transplantation.The recognition of‘nonself’antigen by immune cells mediates the activation of immune signals between donor and host,resulting in adaptive memory immunity and innate trained immunity to the graft,which poses a challenge to the long-term survival of the graft.This review focuses on innate and adaptive immune cells receptor recognition of damage-associated molecular patterns,alloantigens and xenoantigens,which is described as danger model and stranger model.In this review,we also discuss the innate trained immunity in organ transplantation.

关键词： immunity damage graft

DBD等离子体耦合BiOI催化材料降解苯甲羟肟酸的特性与机制

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化工进展 2024年第3期43卷 1565-1575页

作者：董冰岩李贞栋王佩祥涂文娟谭艳雯张芹江西理工大学资源与环境工程学院江西赣州341000

常温常压下,以苯甲羟肟酸(BHA)为处理对象建立了介质阻挡放电(DBD)等离子体催化体系。研究了放电参数对等离子体降解BHA的影响规律,对水热合成法制备的催化材料进行了系列表征分析,考察了各因素对BHA降解的影响,分析了DBD等离子体耦合... 详细信息

常温常压下,以苯甲羟肟酸(BHA)为处理对象建立了介质阻挡放电(DBD)等离子体催化体系。研究了放电参数对等离子体降解BHA的影响规律,对水热合成法制备的催化材料进行了系列表征分析,考察了各因素对BHA降解的影响,分析了DBD等离子体耦合催化剂降解BHA过程中总有机碳(TOC)、pH、∙OH自由基等的变化,通过液相色谱-质谱联用仪分析了降解反应过程的中间产物并探讨了BHA的降解机理。表征结果显示合成的BiOI具有高比表面积、高孔体积、高纯度的介孔纳米片微球,且DBD可以改变催化剂的晶型和结构,具有更高的催化性能。降解性能结果表明,峰值电压、鼓气量等对BHA降解率有很大影响;BHA浓度为80mg/L、体积1000mL,在峰值电压24kV,频率7500Hz,鼓气量30L/min条件下,添加0.3g BiOI催化剂与DBD等离子体耦合效果最好,相对于单一DBD体系,BHA降解率由78.8%提高到88.2%。降解机理分析可知,∙OH是BHA降解的重要活性物质,在等离子体催化作用下,BHA被氧化开环,转化为苯甲酸和乙醇酸等中间体,最终生成H_(2)O和CO_(3)^(2-)等。

关键词：介质阻挡放电等离子体废水降解矿化率催化剂

高重复频率、高功率高次谐波极紫外光源进展及应用

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中国激光 2024年第7期51卷 3-21页

作者：魏子娟高熙泽孟翔宇李政言张庆斌兰鹏飞陆培祥华中科技大学光学与电子信息学院湖北武汉430074 华中科技大学物理学院湖北武汉430074 华中科技大学武汉光电国家研究中心湖北武汉430074 湖北光谷实验室湖北武汉430074

超短超强激光脉冲驱动的高次谐波是一种极紫外到软X射线波段的光源,具有指向性好、时空相干性高、亮度高等优点。高次谐波不但是在阿秒时间尺度上研究电子动力学的基础,而且其各类技术优点也使之成为一种有效的桌面型极紫外相干光源,在... 详细信息

超短超强激光脉冲驱动的高次谐波是一种极紫外到软X射线波段的光源,具有指向性好、时空相干性高、亮度高等优点。高次谐波不但是在阿秒时间尺度上研究电子动力学的基础,而且其各类技术优点也使之成为一种有效的桌面型极紫外相干光源,在集成电路制造在线检测、材料科学、生物医药等领域中具有广泛应用。然而,受限于传统钛蓝宝石固体飞秒激光的平均功率和高次谐波传播过程中的转换效率,目前高次谐波极紫外光源的平均功率亟待提高。介绍了高重复频率、高平均功率高次谐波极紫外光源的产生方式及其应用。首先介绍了光纤、固体、啁啾光学参量放大器等新型高重复频率、高平均功率飞秒激光驱动源在高次谐波产生方面的研究进展,之后讨论了激光高次谐波在弱电离气体介质中的宏观传播效应和相位匹配条件。在此基础上,介绍了高平均功率高次谐波极紫外光源在成像检测方面的应用。

关键词：非线性光学高次谐波极紫外光源飞秒激光器极紫外成像检测

Mechanical Analysis of Viscous-Elastic Fluid Acting on Residual Oil in the Micro Pore

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Open Journal of Fluid Dynamics 2013年第4期3卷 248-251页

作者： lili liu Chao Yu lihui Wang Chengchuyue Fu peixiang li Daqing Petroleum Equipment Group Daqing China Department of Petroleum Engineering Northeast Petroleum University Daqing China Technical Development Department The 2nd Oil Production Factory of Daqing Oilfield Company Limited Daqing China

In order to analyze the normal deviatoric stress that viscous-elastic fluid acting on the residual oil under the situation of different flooding conditions and different permeabilities, Viscous-elastic fluid flow equation is established in the micro pore by choosing the continuity equation, motion equation and the upper-convected Maxwell constitutive equation, the flow field is computed by using numerical analysis, the forces that driving fluid acting on the residual oil in micro pore are got, and the influence of flooding conditions, pore width and viscous-elasticity of driving fluid on force is compared and analyzed. The results show that: the more viscous-elasticity of driving fluid increases, the greater the normal deviatoric stress acting on the residual oil increases;using constant pressure gradient flooding, the lager the pore width is, the greater normal deviatoric stress acting on the residual oil will be.

关键词： Viscous-Elastic Fluid Residual Oil Normal Deviatoric Stress Micro Pore

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动力电池健康评估和老化机制分析技术

时代汽车 2024年第11期 97-99页

作者：常沛祥李荣宇王芳高妍马天翼中汽研新能源汽车检验中心(天津)有限公司天津市电动汽车评价技术重点实验室天津300300 中国汽车技术研究中心有限公司天津300300

动力电池的高比能、高安全和长寿命是新能源汽车产业发展的重要保障。车用动力电池在使用中会出现性能衰减,其耐久性与环境气候、服役工况密切相关。对于动力电池表观性能衰减与微观结构演化存在复杂的多对多构效关系,需要以全生命周期... 详细信息

动力电池的高比能、高安全和长寿命是新能源汽车产业发展的重要保障。车用动力电池在使用中会出现性能衰减,其耐久性与环境气候、服役工况密切相关。对于动力电池表观性能衰减与微观结构演化存在复杂的多对多构效关系,需要以全生命周期演化机理出发,开展跨维度协同分析。本文聚焦“健康状态评估”和“老化机制分析”,从电池老化的原理出发,综合性能、寿命和安全,对车用动力电池的耐久性测试评价关键技术进行了分析和展望。

关键词：新能源汽车动力电池健康状态(SOH) 电池老化

Probing the launching position of the electron wave packet in molecule strong-field tunneling ionization

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Science China(Physics,Mechanics & Astronomy) 2021年第7期64卷 82-90页

作者： Yueming Zhou Jia Tan Min li peixiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan430205China

Strong-field tunneling ionization is the first step for a broad class of phenomena in intense laser-atom/molecule interactions. Accurate information about the electron wave packet from strong-field tunneling ionization of atoms and molecules is of essential importance for understanding various tunneling ionization triggered processes. Here, we survey the property of the electron wave packet in tunneling ionization of molecules with a method based on strong-field photoelectron holography. By solving the time-dependent Schr ¨odinger equation, it is shown that the holographic interference in the photoelectron momentum distribution exhibits the asymmetric behavior with respect to the laser polarization direction, when the molecule is aligned with a nonzero angle to the linearly polarized laser field. We demonstrate that this asymmetry is due to the nonzero initial transverse displacement of the electron wave packet at tunneling. By analyzing the holographic interference, this transverse displacement for the launching of electron wave packet tunneling from the molecules is accurately retrieved. This displacement is directly related to the electron density distribution in molecules, and thus our work developed a novel concept for probing electronic structure in molecules.

关键词： strong-field tunneling ionization photoelectron holography attosecond dynamics

Full experimental determination of tunneling time with attosecond-scale streaking method

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light(Science & Applications) 2022年第8期11卷 1903-1908页

作者： Miao Yu Kun liu Min li Jiaqing Yan Chuanpeng Cao Jia Tan Jintai liang Keyu Guo Wei Cao Pengfei Lan Qingbin Zhang Yueming Zhou peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology430074WuhanChina Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and Technology215009SuzhouChina Optics Valley Laboratory 430074HubeiChina

Tunneling is one of the most fundamental and ubiquitous processes in the quantum world.The question of how long a particle takes to tunnel through a potential barrier has sparked a long-standing debate since the early days of quantum mechanics.Here,we propose and demonstrate a novel scheme to accurately determine the tunneling time of an electron.In this scheme,a weak laser field is used to streak the tunneling current produced by a strong elliptically polarized laser field in an attoclock configuration,allowing us to retrieve the tunneling ionization time relative to the field maximum with a precision of a few attoseconds.This overcomes the difficulties in previous attoclock measurements wherein the Coulomb effect on the photoelectron momentum distribution has to be removed with theoretical models and it requires accurate information of the driving laser fields.We demonstrate that the tunneling time of an electron from an atom is close to zero within our experimental accuracy.Our study represents a straightforward approach toward attosecond time-resolved imaging of electron motion in atoms and molecules.

关键词： tunneling quantum scheme

Real-time observation of frequency Bloch oscillations with fibre loop modulation

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light(Science & Applications) 2021年第3期10卷 434-442页

作者： Hao Chen NingNing Yang Chengzhi Qin Wenwan li Bing Wang Tianwen Han Chi Zhang Weiwei liu Kai Wang Hua Long Xinliang Zhang peixiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Bloch oscillations(BOs)were initially predicted for electrons in a solid lattice to which a static electric field is applied.The observation of BOs in solids remains challenging due to the collision scattering and barrier tunnelling of electrons.Nevertheless,analogies of electron BOs for photons,acoustic phonons and cold atoms have been experimentally demonstrated in various lattice systems.Recently,BOs in the frequency dimension have been proposed and studied by using an optical micro-resonator,which provides a unique approach to controlling the light frequency.However,the finite resonator lifetime and intrinsic loss hinder the effect from being observed practically.Here,we experimentally demonstrate BOs in a synthetic frequency lattice by employing a fibre-loop circuit with detuned phase modulation.We show that a detuning between the modulation period and the fibre-loop roundtrip time acts as an effective vector potential and hence a constant effective force that can yield BOs in the modulation-induced frequency lattices.With a dispersive Fourier transformation,the pulse spectrum can be mapped into the time dimension,and its transient evolution can be precisely measured.This study offers a promising approach to realising BOs in synthetic dimensions and may find applications in frequency manipulations in optical fibre communication systems.

关键词： fibre Bloch dimension