Laser Wakefield Acceleration Using Mid-Infrared Laser Pulses
Guo-Bo Zhang1,2, N. A. M. Hafz2,3**, Yan-Yun Ma1,3**, Lie-Jia Qian2,3, Fu-Qiu Shao1, Zheng-Ming Sheng2,3,4
1College of Science, National University of Defense Technology, Changsha 410073 2Key Laboratory for Laser Plasmas (MOE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 3Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240 4SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK
Abstract：We study a laser wakefield acceleration driven by mid-infrared (mid-IR) laser pulses through two-dimensional particle-in-cell simulations. Since a mid-IR laser pulse can deliver a larger ponderomotive force as compared with the usual 0.8 μm wavelength laser pulse, it is found that electron self-injection into the wake wave occurs at an earlier time, the plasma density threshold for injection becomes lower, and the electron beam charge is substantially enhanced. Meanwhile, our study also shows that quasimonoenergetic electron beams with a narrow energy-spread can be generated by using mid-IR laser pulses. Such a mid-IR laser pulse can provide a feasible method for obtaining a high quality and high charge electron beam. Therefore, the current efforts on constructing mid-IR terawatt laser systems can greatly benefit the laser wakefield acceleration research.
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2016, Vol. 33 
