Relativistic motion and spatial characteristics of radiation from an electron driven by an intense few-cycle laser pulse

Relativistic motion and full spatial characteristics of radiation from an electron driven by an intense few-cycle laser pulse have been investigated theoretically and numerically with a single electron model. It is discovered that the influence of the initial phase on the process of relativistic motion and spatial characteristics of the radiation is apparent for intense few-cycle laser pulse. The characteristics can be used to measure the initial phase of intense few-cycle laser pulse in experiment.