Initial-phase dependence of Thomson scattering spectrum for few-cycle laser pulse

The scattering of few-cycle laser pulse by single electron has been investigated through the classical theory of Thomson scattering using free electrons. The temporal and spatial characteristics of the radiation are presented for different laser intensity and initial phase. For low power-intensity laser pulses, the radiation pattern is the same as that from a dipole antenna. However the radiation pattern is three leafs for the high laser intensity. The influence of the initial phase on the temporal and spatial characteristics of the radiation is stronger for the high intense laser pulse than for the low intense case.