Abstract
The dependence of angular distributions of fast electrons generated in the interaction of p-polarized femtosecond laser pulses with foil targets on laser intensities is investigated. A novel fast electron beam along the front target surface is observed for high laser intensity. It is found that the electron acceleration along the target surface is more efficient than those in other directions.
Highlights
The generation and transport of fast electrons in the interaction of short-pulse high-intensity lasers with targets have been widely investigated because of their potential applications [1,2,3]
The dependence of angular distributions of fast electrons generated in the interaction of p-polarized femtosecond laser pulses with foil targets on laser intensities is investigated
A theory proposed by Nakamura et al [16] and a PIC simulation done by Sentoku et al [17] have predicted a fast electron beam along the target surface due to the quasistatic magnetic field
Summary
The generation and transport of fast electrons in the interaction of short-pulse high-intensity lasers with targets have been widely investigated because of their potential applications [1,2,3]. A theory proposed by Nakamura et al [16] and a PIC simulation done by Sentoku et al [17] have predicted a fast electron beam along the target surface due to the quasistatic magnetic field. The predictions have been confirmed by our recent experiments [18], and supported by our analytic formula [19] The generation of this novel emission can be schematically explained as follows: parts of fast electrons generated by the J×B or vacuum heating could be reflected to the vacuum by the quasistatic magnetic field. The electron count, relative fraction and temperature of the fast electrons increase with the laser intensity This indicates that the electron acceleration along the front target surface is more effective at higher laser intensities than that in the other directions
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