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Effects of Higher-Order Relativistic Nonlinearity and wakefield During a Moderately Intense laser Pulse Propagation in a Plasma Channel

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Communications in Theoretical Physics 2013年第8期60卷 222-226页

作者：刘明萍刘兵兵刘三秋张福阳刘杰 College of Information Engineering Nanchang University Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education Beijing Normal University Department of Physics Nanchang University Institute of Applied Physics and Computational Mathematics

Using a variational approach,the propagation of a moderately intense laser pulse in a parabolic preformed plasma channel is *** effects of higher-order relativistic nonlinearity (HRN) and wakefield are *** effect of HRN serves as an additional defocusing mechanism and has the same order of magnitude in the spot size as that of the transverse wakefield (TWF).The effect of longitudinal wakefield is much larger than those of HRN and TWF for an intense laser pulse with the pulse length equaling the plasma *** catastrophic focusing of the laser spot size would be prevented in the present of HRN and then it varies with periodic focusing oscillations.

关键词： higher-order relativistic nonlinearity laser wakefield plasma channel intense laser pulse

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Electromagnetic Emission from laser wakefields in Magnetized Underdense Plasmas

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Plasma Science and Technology 2012年第10期14卷 874-879页

作者：胡志丹盛政明丁文君王伟民董全力张杰 Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsCAS Key Laboratory for laser Plasmas(Ministry of Education)and Department of Physics Shanghai Jiaotong University

A wakefield driven by a short intense laser pulse in a perpendicularly magnetized underdense plasma is studied analytically and numerically for both weakly relativistic and highly relativistic situations. Owing to the DC magnetic field, a transverse component of the electric fields associated with the wakefield appears, while the longitudinal wave is not greatly affected by the magnetic field up to 22 Tesla. Moreover, the scaling law of the transverse field versus the longitudinal field is derived. One-dimensional particle-in-cell simulation results confirm the analytical results. wakefield transmission through the plasma-vacuum boundary, where electromagnetic emission into vacuum occurs, is also investigated numerically. These results are useful for the generation of terahertz radiation and the diagnosis of laser wakefields.

关键词： laser wakefield magnetized plasma terahertz radiation particle-in-cell simulation

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laser chirp controlled relativistic few-cycle mid-infrared pulse generation

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High Power laser Science and Engineering 2023年第5期11卷 76-84页

作者： Dongao Li Guobo Zhang Jie Zhao Yanting Hu Yu Lu Hao Zhang Qianni Li Dongze Zhang Rong Sha Fuqiu Shao Zhengming Sheng Tongpu Yu Department of Physics National University of Defense TechnologyChangshaChina Department of Nuclear Science and Technology National University of Defense TechnologyChangshaChina Key Laboratory for laser Plasmas(MOE)and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina

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 ***,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 *** 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 ***,the maximum energy conversion efficiency can approach 5.0%.Such a relativistic mid-IR source is promising for a wide range of applications.

关键词： chirp laser pulses laser wakefield photon deceleration relativistic mid-infrared generation

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