Electron acceleration driven by ultrashort and nonparaxial radially polarized laser pulses

Details Electron acceleration driven by ultrashort and nonparaxial radially polarized laser pulses Electron acceleration driven by ultrashort and nonparaxial radially polarized laser pulses

2012-04-25

arxiv.org/abs/1204.5726v1

Physics

Accelerator Physics

3 pages. Accepted for publication in Optics Letters

Scientific paper

Exact closed-form solutions to Maxwell's equations are used to investigate the acceleration of electrons in vacuum driven by ultrashort and nonparaxial radially polarized laser pulses. We show that the threshold power above which significant acceleration takes place is greatly reduced by using a tighter focus. Moreover, electrons accelerated by tightly focused single-cycle laser pulses may reach around 80% of the theoretical energy gain limit, about twice the value previously reported with few-cycle paraxial pulses. Our results demonstrate that the direct acceleration of electrons in vacuum is well within reach of the current laser technology.

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