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| 1 | Absolute instability modes due to rescattering of stimulated Raman scattering in a large nonuniform plasma显示文摘Absolute instability modes due to secondary scattering of stimulated Raman scattering (SRS) in a large nonuniform plasma are studied theoretically and numerically. The backscattered light of convective SRS can be considered as a pump light with a finite bandwidth. The different frequency components of the backscattered light can be coupled to develop absolute SRS instability near their quarter-critical densities via rescattering process. The absolute SRS mode develops a Langmuir wave with a high phase velocity of about c/■ with c the light speed in vacuum. Given that most electrons are at low velocities in the linear stage, the absolute SRS mode grows with very weak Landau damping. When the interaction evolves into the nonlinear regime, the Langmuir wave can heat abundant electrons up to a few hundred ke V via the SRS rescattering. Our theoretical model is validated by particle-in-cell simulations. The absolute instabilities may play a considerable role in the experiments of inertial confinement fusion. | Yao Zhao Zhengming Sheng Suming Weng Shengzhe Ji Jianqiang Zhu | 2019 | High Power Laser Science and Engineering2019，7，1： | 2 |
| 2 | Angular distribution of terahertz emission from laser interactions with solid targets显示文摘Intense femtosecond laser-plasma interactions can produce high power terahertz radiations.In our experiment,the polished copper target was irradiated by a p-polarized laser with intensity of more than 1018 W/cm2 at an incident angle of 67.5 from the target normal.The THz energy from three dierent detection angles is measured.The maximum emission is found in the direction at an angle of 45 to the laser backward direction,which is more than one order of magnitude higher than in the other two directions.A simple theoretical model has been established to explain the measurements. | DU Fei LI Chun ZHOU MuLin WANG WeiMin SU LuNing ZHENG Yi GE XuLei LI YuTong MA JingLong LIU XiaoLong ZHANG Lu SHENG ZhengMing CHEN LiMing LU Xin DONG QuanLi WANG ZhaoHua WEI ZhiYi ZHANG Jie | 2012 | Science China(Information Sciences)2012，55，1： | 2 |
| 3 | High-quality MeV protons from laser interaction with umbrellalike cavity target显示文摘 | Ma Yanyun Sheng Zhengming Gu Yuqiu | 2009 | Phys Plasmas2009，16，03： | 1 |
| 4 | High-quality MeV protons from laser interaction with umbrellalike cavity target显示文摘 | Ma Yangyun Sheng Zhengming Gu Yuqiu | 2009 | Physics of Plasmas2009，16，03： | 1 |
| 5 | The influence of target material and thickness on proton energy and angular distribution显示文摘The paper has studied the influence of target material and thickness on energy and angular distributions of the protons generated by using an 800 nm,60 fs,0.24 J laser pulse to irradiate solid target foils.The results show that the initial density and thickness of the targets will affect the formation of the acceleration sheath fields in the target normal direction.For the same target thickness,using lower density target materials can obtain a higher proton maximum energy.However,lower density targets tend to be deformed due to the shock waves launched by the laser pulses,making the proton spatial distribution more divergent. | SU LuNing LIU BiCheng LIN XiaoXuan LIU Feng DU Fei LIU XiaoLong ZHENG Yi GE XuLei LI YuTong SHENG ZhengMing CHEN LiMing WANG WeiMin MA JingLong LU Xin WEI ZhiYi CHEN JiaEr ZHANG Jie | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，2： | 1 |
| 6 | Dense quasi-monoenergetic attosecond electron bunches from laser interaction with wire and slice targets显示文摘 | Ma Yanyun Sheng Zhengming Li Yutong | 2006 | Phys Plasmas2006，13，11： | 1 |
| 7 | Three-dimensional particle-in-cell simulations of energetic electron generation and transport with relativistic laser pulses in overdense plasmas显示文摘 | Sentoku Y Mima K Sheng Zhengming | 2002 | Phys Rev E2002，65，04： | 1 |
| 8 | Efficient bright γ-ray vortex emission from a laser-illuminated light-fan-in-channel target显示文摘X/γ-rays have many potential applications in laboratory astrophysics and particle physics.Although several methods have been proposed for generating electron,positron,and X/γ-photon beams with angular momentum(AM),the generation of ultra-intense brilliant γ-rays is still challenging.Here,we present an all-optical scheme to generate a high-energy γ-photon beam with large beam angular momentum(BAM),small divergence,and high brilliance.In the first stage,a circularly polarized laser pulse with intensity of 10^(22) W/cm^(2) irradiates a micro-channel target,drags out electrons from the channel wall,and accelerates them to high energies via the longitudinal electric fields.During the process,the laser transfers its spin angular momentum(SAM)to the electrons’orbital angular momentum(OAM).In the second stage,the drive pulse is reflected by the attached fan-foil and a vortex laser pulse is thus formed.In the third stage,the energetic electrons collide head-on with the reflected vortex pulse and transfer their AM to the γ-photons via nonlinear Compton scattering.Three-dimensional particle-in-cell simulations show that the peak brilliance of the γ-ray beam is∼10^(22) photons·s^(-1)·mm^(-2)·mrad^(-2) per 0.1% bandwidth at 1 MeV with a peak instantaneous power of 25 TW and averaged BAM of 10^(6)h/photon.The AM conversion efficiency from laser to the γ-photons is unprecedentedly 0.67%. | Hao Zhang Jie Zhao Yanting Hu Qianni Li Yu Lu Yue Cao Debin Zou Zhengming Sheng Francesco Pegoraro Paul McKenna Fuqiu Shao Tongpu Yu | 2021 | High Power Laser Science and Engineering2021，9，3： | 1 |
| 9 | Three-dimensional particle in cell simulations of energetic electron generation and transport with relativistic laser pulses in overdense plasmas显示文摘 | Sentoku Y Mima K Sheng Zhengming | 2002 | Phys Rev E2002，65，04： | 1 |
| 10 | Dense quasi-monoenergetic attosecond electron bunches from laser interaction with wire and slice targets显示文摘 | Ma Yanyun Sheng Zhengming Li Yutong | 2006 | Physics of Plasma2006，13，11： | 1 |
| 11 | Stimulated Raman scattering excited by incoherent light in plasma显示文摘Stimulated Raman scattering(SRS)excited by incoherent light is studied via particle-in-cell simulations.It is shown that a large bandwidth of incoherent light can reduce the growth of SRS and electron heating considerably in the linear stage.However,different components of the incoherent light can be coupled by the Langmuir waves,so that stimulated Raman backward scattering can develop.When the bandwidth of incoherent light is larger than the Langmuir wave frequency,forward SRS can be seeded between different components of the incoherent light.The incoherent light can only increase the time duration for nonlinear saturation but cannot diminish the saturation level obviously. | Yao Zhao Suming Weng Min Chen Jun Zheng Hongbin Zhuo Zhengming Sheng | 2017 | Matter and Radiation at Extremes2017，2，4： | 1 |
| 12 | Polarization of terahertz emission out of incident plane from laser interactions with solid targets显示文摘A powerful terahertz(THz) pulse was produced by a p-polarized,70 fs,800 nm laser interacting with solid targets at an incident angle of 45°.The polarization of the THz emission was measured out of the laser incident plane.The results showed that it was linearly polarized.We established a surface current model to explain this phenomenon,assuming that the transient current moving along the plasma surface was responsible for the generation of the THz emission.The model expectation and the experimental result were in good agreement. | DU Fei LI Chun ZHOU MuLin WANG WeiMin SU LuNing ZHENG Yi LI YuTong MA JingLong SHENG ZhengMing CHEN LiMing LU Xin WANG ZhaoHua WEI ZhiYi ZHANG Jie | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，4： | 1 |
| 13 | Proton angular distribution research by a new angle-resolved proton energy spectrometer显示文摘The proton spectral and angular distributions simultaneously within the target normal direction and laser propagation direction by using an angle-resolved proton energy spectrometer are studied.For the protons generated in the interactions of 100 fs,800nm laser pulses with aluminum foil targets,the deviations of proton beam centers of different energies from the target normal direction towards the laser propagation direction are different.This is probably because of the toroidal magnetic fields generated at the rear target surface,which deflect protons transversely.As a result,protons in low energy range have large deviation angles,protons in middle energy range have the smallest deviation angles,while protons in high energy tail have large deviation angles. | SU LuNing ZHENG Yi LIU Meng HU ZhiDan WANG WeiMin YUAN XiaoHui XU MiaoHua SHENG ZhengMing SHEN ZhongWei FAN HaiTao LI YuTong MA JingLong LU Xin CHEN LiMing WANG ZhaoHua WEI ZhiYi ZHANG Jie | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，5： | 1 |
| 14 | Collisionless electrostatic shock generation and ion acceleration by ultraintense laser pul- ses in overdense plasmas显示文摘 | Chen Min Sheng Zhengming Dong Quanli | 2007 | Phys Plasmas2007，14，05： | 1 |
| 15 | Ion acceleration by colliding electrostatic shock waves in laser-solid interaction显示文摘 | Chen Min Sheng Zhengming Dong Quanli | 2007 | Phys Plasmas2007，14，11： | 1 |
| 16 | Laser chirp controlled relativistic few-cycle mid-infrared pulse generation显示文摘Relativistic few-cycle mid-infrared(mid-IR)pulses are unique tools for strong-field physics and ultrafast science,but are difficult to generate with traditional nonlinear optical methods.Here,we propose a scheme to generate such pulses with high efficiency via plasma-based frequency modulation with a negatively chirped laser pulse(NCLP).The NCLP is rapidly compressed longitudinally due to dispersion and plasma etching,and its central frequency is downshifted via photon deceleration due to the enhanced laser intensity and plasma density modulations.Simulation results show that few-cycle mid-IR pulses with the maximum center wavelength of 7.9µm and pulse intensity of a_(MIR)=2.9 can be generated under a proper chirp parameter.Further,the maximum energy conversion efficiency can approach 5.0%.Such a relativistic mid-IR source is promising for a wide range of applications. | Dongao Li Guobo Zhang Jie Zhao Yanting Hu Yu Lu Hao Zhang Qianni Li Dongze Zhang Rong Sha Fuqiu Shao Zhengming Sheng Tongpu Yu | 2023 | High Power Laser Science and Engineering2023，11，5： | 0 |
| 17 | Initial Evolution of a Laser Wake-Field in Plasmas显示文摘Numerical calculations are used to study the initial temporal evolution of the wake-field produced by a short laser pulse.Results are compared to the previous quasi-static solutions.The usually adopted quasi-static approximation is found not appropriate for describing the wake-field generation at initial stages. | SHENG Zhengming MA Jinxiu YU Wei XU Zhizhan | 1993 | Chinese Physics Letters1993，10，1： | 0 |
| 18 | Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments显示文摘Terahertz radiation with a Bessel beam profile is demonstrated experimentally from a two-color laser filament in air,which is induced by tailored femtosecond laser pulses with an axicon.The temporal and spatial distributions of Bessel rings of the terahertz radiation are retrieved after being collected in the far field.A theoretical model is proposed,which suggests that such Bessel terahertz pulses are produced due to the combined effects of the inhomogeneous superluminal flament structure and the phase change of the two-color laser components inside the plasma channel.These two efects lead to wavefront crossover and constructive/destructive interference of terahertz radiation from different plasma sources along the laser flament,respectively.Compared with other methods,our technique can support the generation of Bessel pulses with broad spectral bandwidth.Such Bessel pulses can propagate to the far field without significant spatial spreading,which shall provide new opportunities for terahertz applications. | Zhelin Zhang Jiayang Zhang Yanping Chen Tianhao Xia Linzheng Wang Bonan Han Feng He Zhengming Sheng Jie Zhang | 2022 | Ultrafast Science2022，，1： | 0 |
| 19 | Anomalous-plasmoid-ejection-induced secondary magnetic reconnection: modeling solar flares and coronal mass ejections by laser–plasma experiments显示文摘The driving mechanism of solar flares and coronal mass ejections is a topic of ongoing debate, apart from the consensus that magnetic reconnection plays a key role during the impulsive process. While present solar research mostly depends on observations and theoretical models, laboratory experiments based on high-energy density facilities provide the third method for quantitatively comparing astrophysical observations and models with data achieved in experimental settings.In this article, we show laboratory modeling of solar flares and coronal mass ejections by constructing the magnetic reconnection system with two mutually approaching laser-produced plasmas circumfused of self-generated megagauss magnetic fields. Due to the Euler similarity between the laboratory and solar plasma systems, the present experiments demonstrate the morphological reproduction of flares and coronal mass ejections in solar observations in a scaled sense,and confirm the theory and model predictions about the current-sheet-born anomalous plasmoid as the initial stage of coronal mass ejections, and the behavior of moving-away plasmoid stretching the primary reconnected field lines into a secondary current sheet conjoined with two bright ridges identified as solar flares. | Quanli Dong Dawei Yuan Shoujun Wang Xun Liu Yutong Li Xiaoxuan Lin Huigang Wei Jiayong Zhong Shaoen Jiang Yongkun Ding Bobin Jiang Kai Du Yongjian Tang Mingyang Yu Xiantu He Neng Hua Zhanfeng Qiao Kuixi Huang Ming Chen Jianqiang Zhu Gang Zhao Zhengming Sheng Jie Zhang | 2013 | High Power Laser Science and Engineering2013，1，1： | 0 |
| 20 | Collimated gamma rays from laser wakefield accelerated electrons显示文摘Betatron radiation from laser wakefield accelerated electrons and X-rays scattered off a counter-propagating relativistic electron bunch arecollimated and hold the potential to extend the energy range to hard X-ray or gamma ray band. The peak brightness of these incoherent radiations could reach the level of the brightest synchrotron light sources in the world due to their femtosecond pulse duration and source sizedown to a few micrometers. In this article, the principle and properties of these radiation sources are briefly reviewed and compared. Then wepresent our recent progress in betatron radiation enhancement in the perspective of both photon energy and photon number. The enhancement istriggered by using a clustering gas target, arousing a second injection of a fiercely oscillating electron bunch with large charge or stimulating aresonantly enhanced oscillation of the ionization injected electrons. By adopting these methods, bright photon source with energy over 100 keVis generated which would greatly impact applications such as nuclear physics, diagnostic radiology, laboratory astrophysics and high-energydensity science. | Minghua Li Liming Chen Dazhang Li Kai Huang Yifei Li Yong Ma Wenchao Yan Mengze Tao Junhao Tan Zhengming Sheng Jie Zhang | 2018 | Matter and Radiation at Extremes2018，3，4： | 0 |
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