A new phenomenon of an enhanced relativistic transparency of overdense plasmas by the influence of hot-electron refluxing has been discovered via particle-in-cell simulations. When a p-polarized laser pulse, with intensity below the self-induced-transparency (SIT) threshold, obliquely irradiates a thin overdense plasma, the initially opaque plasma becomes transparent after a time interval that is linearly dependent on the thickness of the plasma. This phenomenon can be interpreted as a consequence of hot-electron refluxing, which reduces the effective electron density by longitudinal heating. When the laser intensity is higher than the SIT threshold, the penetration velocity of the laser in the plasma is enhanced when the refluxing is present.
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March 2017
Research Article|
March 22 2017
Hot-electron refluxing enhanced relativistic transparency of overdense plasmas
Yong Yu;
Yong Yu
1National Key Laboratory of Shock Wave and Detonation Physics,
Institute of Fluid Physics
, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
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Xiao-Ya Li;
Xiao-Ya Li
a)
1National Key Laboratory of Shock Wave and Detonation Physics,
Institute of Fluid Physics
, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
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Zi-Yu Chen;
Zi-Yu Chen
1National Key Laboratory of Shock Wave and Detonation Physics,
Institute of Fluid Physics
, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
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Jia-Xiang Wang
;
Jia-Xiang Wang
2State Key Laboratory of Precision Spectroscopy,
East China Normal University
, Shanghai 200062, People's Republic of China
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Bai-Fei Shen;
Bai-Fei Shen
3State Key Laboratory of High Field Laser Physics,
Shanghai Institute of Optics and Fine Mechanics
, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
4
Shanghai Normal University
, Shanghai 200234, People's Republic of China
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Wen-Jun Zhu
Wen-Jun Zhu
b)
1National Key Laboratory of Shock Wave and Detonation Physics,
Institute of Fluid Physics
, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
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a)
Electronic mail: xylapril@gmail.com
b)
Electronic mail: wjzhu@caep.cn
Phys. Plasmas 24, 033117 (2017)
Article history
Received:
September 22 2016
Accepted:
February 13 2017
Citation
Yong Yu, Xiao-Ya Li, Zi-Yu Chen, Jia-Xiang Wang, Bai-Fei Shen, Wen-Jun Zhu; Hot-electron refluxing enhanced relativistic transparency of overdense plasmas. Phys. Plasmas 1 March 2017; 24 (3): 033117. https://doi.org/10.1063/1.4977459
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