Analysis of pulse widths on the spatial characteristics of electron motion and radiation driven by linearly polarized tightly focused laser pulses

摘要

This paper demonstrates the influence of pulse width on the full space characteristics of electron motion and radiation distribution from a single electron driven by a linearly polarized femtosecond tightly focused gaussian laser pulse (FTFGLP). The laser-accelerated electron model is created by the interaction between a tightly focused linearly polarized femtosecond gaussian laser pulse and an electron. Driven by the electromagnetic field produced by laser pulse, the electron produces relativistic oscillation and the corresponding full spatial radiation. Through numerical calculation, it is concluded that the space characteristics of relative electron changes firstly and then tends to be stable. In detail, with the increase of plus width, the amplitude of electronic motion tends to a constant value, and there is an optimal value of the change of drift distance that tends to be stable. Moreover, due to the increase of plus width, the phase variation of electron motion in the characteristics of electron space radiation distribution intensifies, and the number of branch gradually increases, but the Angle of the maximum branch is basically unchanged. The characteristics is of great use in some real experiments of linearly polarized laser plus.