Nonlinear Thomson scattering radiation characteristics in tightly focused linearly polarized laser pulses with different pulse widths

Abstract

In our work, the radiation characteristics of the pulse width for nonlinear Thomson scattering produced by the interaction of a linearly polarized tightly focused laser with a stationary electron are investigated. Theoretical derivation without approximation and numerical simulation results reveal that long pulses imply more complex electrodynamic processes. Radiation bifurcation and coupling phenomena caused by increasing pulse width are found. The radiation energy in the direction of maximum radiation also decreases with the increase of the pulse width. For the first time, the acceleration changes and γ value changes of electron motion caused by linearly polarized laser pulses are shown, and these changes are combined to explain the changes of radiation. At the same time, the full-spatial angular distribution of nonlinear Thomson scattering induced by linearly polarized light was plotted for the first time, and the existence and variation of the radiation angular width were found.