Study of the process of tightly focused linearly polarized laser pulses interacting with a stationary single electron

Abstract

In this paper, we focus on the study of nonlinear Thomson scattering process in tightly focused linearly polarized laser pulses. We simulated the interaction of linearly polarized laser pulse with a stationary electron. We find that the interaction process does not evolve linearly with increasing time and can be divided into a period of strong interaction and a period of weak interaction. During strong interaction period, the electron's radiation power initially forms a single-peak distribution across the spatial domain, then evolves into a double-peak distribution. During weak interaction period, the double-peak structure gradually evolves into a multi-peak structure. The collimation of the electron radiation independently changes, first strengthening and then weakening. We analyze in detail the change in the azimuthal angle in the direction of maximum radiation corresponding to the peak radiated power. In addition, a more simplified proportional equation for the radiated power was derived, and we verified its accuracy with simulations. In the direction of maximum radiation, we also observed the process of the radiated power in the time domain and the process of the radiant energy in the frequency domain. By varying the interaction time, electron radiation with the desired properties can be obtained.