Characteristics of linear Thomson scattering spectrum with few-cycle laser pulse

Based on the classical electromagnetic radiation theory, the spectral characteristics of 90° linear Thomson scattering with linearly polarized few-cycle laser pulses were obtained. The research results showed that the fewer the cycle number of the few-cycle pulse was, the wider the scattering spectrum and the weaker the center intensity of the spectrum were, and the spectral width was proportional to the square of the electronic relativity factor, as well as the incidence pulse frequency. The spectral intensity was proportional to the square of the product of normalized light field intensity and electronic relativity factor. The carrier-envelope function could widen radiation spectrum further and make the spectrum symmetry better and eliminate the oscillation of spectrum. The spectral int