| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Electron Dynamics and Characteristics of Attosecond Electromagnetic Emissions in Relativistic Laser-Plasma Interactions |
| Yi-Ying Wu1, Quan-Li Dong1,2**, Zhao-Hua Wang2, Ping Liu1, Cheng-Zhen Wang1, Yi-Hui Zhang1, Zheng-Ming Sheng3,4, Jie Zhang4,5 |
1School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025
2Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
3School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240
4Innovative Collaboration Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240
5University of Chinese Academy of Sciences, Beijing 100864
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| Cite this article: |
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Yi-Ying Wu, Quan-Li Dong, Zhao-Hua Wang et al 2018 Chin. Phys. Lett. 35 095201 |
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Abstract Generation of attosecond electromagnetic (EM) pulses and the associated electron dynamics are studied using particle-in-cell simulations of relativistic laser pulses interacting with over-dense plasma foil targets. The interaction process is found to be so complicated even in the situation of utilizing driving laser pulses of only one cycle. Two electron bunches closely involved in the laser-driven wavebreaking process contribute to attosecond EM pulses through the coherent synchrotron emission process whose spectra are found to follow an exponential decay rule. Detailed investigations of electron dynamics indicate that the early part of the reflected EM emission is the high-harmonics produced through the relativistic oscillating mirror mechanism. High harmonics are also found to be generated through the Bremsstrahlung radiation by one electron bunch that participates in the wavebreaking process and decelerates when it experiences the local wavebreaking-generated high electrostatic field in the moving direction.
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Received: 20 March 2018
Published: 29 August 2018
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| PACS: |
52.38.Kd
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(Laser-plasma acceleration of electrons and ions)
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52.25.Os
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(Emission, absorption, and scattering of electromagnetic radiation ?)
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52.25.Tx
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(Emission, absorption, and scattering of particles)
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 11674146, and the National Basic Research Program of China under Grant No 2013CBA01500. |
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