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Electron acceleration by tightly focused radially polarized few-cycle laser pulses |
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| Authors: | Liu Jin-Lu Sheng Zheng-Ming and Zheng Jun |
| Institution: | Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China;Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China;Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China |
| Abstract: | Within the framework of plane-wave angular spectrum analysis of the electromagnetic field structure, a solution valid for tightly focused radially polarized few-cycle laser pulses propagating in vacuum is presented. The resulting field distribution is significantly different from that based on the paraxial approximation for pulses with either small or large beam diameters. We compare the electron accelerations obtained with the two solutions and find that the energy gain obtained with our new solution is usually much larger than that with the paraxial approximation solution. |
| Keywords: | radially polarized laser pulses few-cycle pulses plane-wave angular spectrum analysis direct laser acceleration of electrons |
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