Abstract Electron dynamics and energy gain in a tightly focused laser beam in vacuum are investigated by numerical simulations. There exist two acceleration mechanisms, i.e. acceleration by the longitudinal field or by the transverse field, which corresponds to two different trajectories. The relationship between the energy gain and the injection parameters of electrons, including the injection angle and momentum, is shown. For given laser parameters, the optimum injection parameters can be obtained.
Received: 06 December 2004
Revised: 10 January 2005
Accepted manuscript online:
PACS:
42.60.Jf
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project partially supported by the National Natural Science Foundation of China (Grant Nos 10335020,
10105014 and 10390160), the National High-Tech ICF program, and the National Key Basic Research Special Foundation (Grant No G1999075200).
Cite this article:
Chen Min (陈民), Sheng Zheng-Ming (盛政明), Zhang Jie (张杰) Optimal injection scheme for electron acceleration by a tightly focused laser beam 2005 Chinese Physics 14 1407
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