ABSTRACT
The influence of laser intensity on relativistic motion and the energy gains from electron oscillations driven by circularly polarized tightly focused laser pulses have been investigated theoretically and numerically using a single electron model. Ponderomotive force accelerates an electron at the focus of diverse intensity tightly focused short-pulse laser is considered. Due to the asymmetry of acceleration and deceleration, the accelerated electron is extracted from the tightly focused laser pulse by the longitudinal ponderomotive force. Since the distance of the election movement much less than the beam waist radius, the laser pulse acting on the election is close to the plane wave during the interaction, so the electron can not be accelerated. By using MATLAB to simulate the electron trajectory and dimensionless particle normalized energy, found that when pulse width and beam waist are constant, the energy of the electron is increasing with the increasing of laser pulse intensity.
