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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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| Authors: | LIU Ming-Ping LIU Bing-Bing LIU San-Qiu ZHANG Fu-Yang LIU Jie |
| Institution: | 1. College of Information Engineering, Nanchang University, Nanchang 330031, China; 2. Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, Beijing Normal University, Beijing 100875, China; 3. Department of Physics, Nanchang University, Nanchang 330047, China; 4. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
| Abstract: | Using a variational approach, the propagation of a moderately intense laser pulse in a parabolic preformed plasma channel is investigated. The effects of higher-order relativistic nonlinearity (HRN) and wakefield are included. The 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 wavelength. The catastrophic focusing of the laser spot size would be prevented in the present of HRN and then it varies with periodic focusing oscillations. |
| Keywords: | higher-order relativistic nonlinearity laser wakefield plasma channel intense laser pulse |
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