Quan-Li Dong

Shanghai Jiao Tong University

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Jie Zhang

Shanghai Jiao Tong University

Z. M. Sheng

Jiangnan University

Yutong Li

Chinese Academy of Sciences

Shoujun Wang

Nankai University

Zhaohua Wang

Chinese Academy of Sciences

Weimin Wang

Peking University

Zhiyi Wei

Chinese Academy of Sciences

Liming Chen

Shanghai Jiao Tong University

Jinglong Ma

Chinese Academy of Sciences

Min Chen

Shanghai Jiao Tong University

Cooperative Institutions

Chinese Academy of Sciences

120

Institute of Physics

Shanghai Jiao Tong University

University of Chinese Academy of Sciences

Peking University

University of Science and Technology of China

National Laboratory for Superconductivity

China Academy of Engineering Physics

Czech Academy of Sciences, Institute of Physics

Osaka University

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Post-solitons and electron vortices generated by femtosecond intense laser interacting with uniform near-critical-density plasmas

Chinese Physics B (2021)

Dongning Yue Min Chen Yao Zhao Pan-Fei Geng Xiaohui Yuan

Generation of nonlinear structures, such as stimulated Raman side scattering waves, post-solitons and electron vortices, during ultra-short intense laser pulse transportation in near-critical-density (NCD) plasmas is studied by using multi-dimensional particle-in-cell (PIC) simulations. In two-dimensional geometries, both P- and S-polarized laser pulses are used to drive these nonlinear structures and to check the polarization effects on them. In the S-polarized case, the scattered waves can be captured by surrounding plasmas leading to the generation of post-solitons, while the main pulse excites convective electric currents leading to the formation of electron vortices through Kelvin–Helmholtz instability (KHI). In the P-polarized case, the scattered waves dissipate their energy by heating surrounding plasmas. Electron vortices are excited due to the hosing instability of the drive laser. These polarization dependent physical processes are reproduced in two different planes perpendicular to the laser propagation direction in three-dimensional simulation with linearly polarized laser driver. The current work provides inspiration for future experiments of laser–NCD plasma interactions.

10.1088/1674-1056/ac46c5

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Citations (2)

Plasmoid Ejection and Secondary Current Sheet Generation from Magnetic Reconnection in Laser-Plasma Interaction

Physical Review Letters (2012)

Quan-Li Dong Shoujun Wang Quanming Lu Can Huang Dawei Yuan

Reconnection of the self-generated magnetic fields in laser-plasma interaction was first investigated experimentally by Nilson {\it et al.} [Phys. Rev. Lett. 97, 255001 (2006)] by shining two laser pulses a distance apart on a solid target layer. An elongated current sheet (CS) was observed in the plasma between the two laser spots. In order to more closely model magnetotail reconnection, here two side-by-side thin target layers, instead of a single one, are used. It is found that at one end of the elongated CS a fan-like electron outflow region including three well-collimated electron jets appears. The ($>1$ MeV) tail of the jet energy distribution exhibits a power-law scaling. The enhanced electron acceleration is attributed to the intense inductive electric field in the narrow electron dominated reconnection region, as well as additional acceleration as they are trapped inside the rapidly moving plasmoid formed in and ejected from the CS. The ejection also induces a secondary CS.

Plasmoid

Collimated light

Current sheet

10.1103/physrevlett.108.215001

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Citations (110)

Demonstration of Mo Soft X-Ray Lasers with a Grazing Incidence Pumping Scheme in the XL-II Facility

Chinese Physics Letters (2009)

Quan-Li Dong Shoujun Wang Zhaohua Wang Zhao Jing Wei Zhi-Yi

A Ni-like Mo soft x-ray laser (SXRLs) operating at 18.9nm has been demonstrated by employing a grazing incidence pumping scheme with 120mJ in the 200ps pre-pulse and 140mJ in the 200fs main pulse. The SXRL gain is estimated to be 1.5–3cm−1 when a grazing incidence angle of 14° is applied. Numerical simulations are also performed to investigate the dynamics of the ion distribution. It is found that a high intensity at 2.4 × 1014 W/cm2 of the 200 fs main pulse could heat the pre-plasma rapidly to an appropriate temperature for population inversion, and could compensate for the shortage of the total pump energy to a certain extent.

Economic shortage

Population inversion

Intensity

10.1088/0256-307x/26/6/064214

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Citations (3)

Single-Shot Broad Bandwidth Terahertz Pulse Measurement

Plasma Science and Technology (2012)

Mu-Lin Zhou Feng Liu Chun Li Fei Du Yutong Li

A new method based on a chirped optical pulse interferogram has been proposed to measure terahertz radiation. The frequency domain phase information of the interferogram is used to extract the time-domain terahertz pulse waveform. In principle, the resolution of our method can be as high as the unchirped probe pulse duration, with the advantages of relatively simple measurement setup and signal extracting techniques.

SIGNAL (programming language)

Single shot

Photomixing

10.1088/1009-0630/14/1/05

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Citations (3)

Quasibound states in graphene quantum-dot nanostructures generated by concentric potential barrier rings

Chinese Physics B (2012)

Zhaotan Jiang Chenglong Yu Quan-Li Dong

We study the quasibound states in a graphene quantum-dot structure generated by the single-, double-, and triple-barrier electrostatic potentials. It is shown that the strongest quasibound states are mainly determined by the innermost barrier. Specifically, the positions of the quasibound states are determined by the barrier height, the number of the quasibound states is determined by the quantum-dot radius and the angular momentum, and the localization degree of the quasibound states is influenced by the width of the innermost barrier, as well as the outside barriers. Furthermore, according to the study on the double- and triple-barrier quantum dots, we find that an effective way to generate more quasibound states with even larger energy level spacings is to design a quantum dot defined by many concentric barriers with larger barrier-height differences. Last, we extend our results into the quantum dot of many barriers, which gives a complete picture about the formation of the quasibound states in the kind of graphene quantum dot created by many concentric potential barrier rings.

Rectangular potential barrier

10.1088/1674-1056/21/2/027303

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Citations (4)

Evolution of filaments and associated magnetic fields produced by the Weibel Instability in two counterstreaming laser plasmas

Physics of Plasmas (2018)

Hui-Ya Liu Quan-Li Dong Shengzhe Ji Ning Kang Shenlei Zhou

The evolution of filaments due to the Weibel Instability was studied through experiments of two asymmetric counterstreaming plasmas produced by nanosecond laser pulses with total energy more than 1 kJ. The magnetic field around filaments was measured by the Faraday rotation technique as tens of Tesla after an exponential growth at the rate of 0.148 ns−1, which was in good agreement with the calculated features of the Weibel Instability with experimental plasma properties. The temporal evolution of the separation distances between filaments was also recorded and fitted with two analytical models by Medvedev et al. [Astrophys. J. 618, L75–L78 (2005)] and Ruyer et al. [Phys. Plasmas 22, 032102 (2015)], respectively. While the magnetic field growth followed the quasi-linear theory of the Weibel Instability process in counterstreaming plasmas of non-relativity, the evolution of filaments through coalescence behaviors presented a nonlinear temporal increase in the filament widths.

Weibel instability

Coalescence (physics)

Streaming instability

Kink instability

10.1063/1.5028525

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Polarization-dependent supercontinuum generation from light filaments in air

Optics Letters (2005)

Hui Yang Jie Zhang Qiuju Zhang Zuoqiang Hao Yutong Li

We investigate polarization-dependent properties of the supercontinuum emission generated from filaments produced by intense femtosecond laser pulses propagating through air over a long distance. The conversion efficiency from the 800-nm fundamental to white light is observed to be higher for circular polarization than for linear polarization when the laser intensity exceeds the threshold of the breakdown of air.

Supercontinuum

10.1364/ol.30.000534

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Citations (39)

Numerical study on coherent keV x ray generation by the interaction of ultra-short intense lasers with thin solid foils

Acta Physica Sinica (2012)

Jia Qian-Qian Weimin Wang Quan-Li Dong Z. M. Sheng

The scheme of x ray generation by the interaction of ultra-short intense laser puls with two thin solid foils is re-investigated by one-dimensional numerical simulation. Attention is paid particularly to the effects of the thickness and the density distribution of the source target on the frequency spectrum and the conversion efficiency of the produced x ray emission, where the source target provides a relativistic electron layer. When the thickness of the source target is comparable to or smaller than the wavelength of x ray /4x2 ( is the wavelength of the incident laser), quasi-monochromatic x ray spectrum can be generated. Otherwise the spectrum will be broadened significantly and the maximum frequency will decrease rapidly. In addition, the presence of inhomogeneous preplasma in front of the foil will induce a similar change of the spectrum.

Monochromatic color

Electromagnetic spectrum

10.7498/aps.61.015203

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Citations (1)

Intense laser-driven electrostatic shocks and its acceleration of ions in overdense plasmas

Bulletin of the American Physical Society (2008)

Quan-Li Dong Minqing He Z. M. Sheng Yutong Li Jie Zhang

Source

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Generation of extreme-ultraviolet and x-ray light from a propagating nanometer electron layer in few-cycle laser interaction with solid targets

Physical review. A/Physical review, A (2024)

Xinmeng Liu Dongning Yue Quan-Li Dong Ziqiang Shao Zhe Li

A new generation mechanism of coherent extreme-ultraviolet (XUV) and x-ray radiation presents in the few-cycle laser interaction with solid density plasma. Two-dimensional simulations show that the XUV and x-rays intensities do not have power law or exponential law dependence on the frequency which is followed by the high harmonic spikes generated through the coherent-wake-emission or relativistically oscillating mirror processes. The XUV and x rays are actually nonlinearly scattered by the successively propagating nanometer electron layers formed in the combined effects of the ponderomotive forces of the incident laser pulse and the electric force due to the charge separation. The nanometer electron layers move in the laser field and the characteristic electrons have their directions bended several times due to the change of the laser's magnetic field. At every bending point, these electrons emit strong synchrotron radiation along a direction that deviates from the reflected laser, even if the normalized drive laser amplitude is at ${a}_{0}\ensuremath{\approx}1$. The simulation results for two cases with and without the density profile truncation indicate that the efficiency of this mechanism strongly depends on the preplasma.

Extreme ultraviolet

Nanometre

Ultraviolet

Solid surface

10.1103/physreva.109.043519

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