Characteristics Of Emission Due To Electron Oscillation Driven By Linearly Polarized Few-cycle Laser Pulse And Its Application Research

With ultrashort pulse high-power laser it has become possible via strong focusing to extend theirradiance to levels to relativistic intensity and with petawatt level lasers intensities much higherthan this may be achieved. As a novel X-ray source, laser synchrotron radiation of relativisticelectrons by a laser pulse has been widely studied because of its characteristics such as tenability,miniaturization, high brightness, and ultrashort pulse, and potential applications. These applicationscall for a thorough understanding of the various nonlinear phenomena arising when a relativisticallyintense electromagnetic pulse interacts with matter.Some results in this paper are given as follows:1. The electron dynamics and radiation characteristics of radiation from an electron driven byan intense few-cycle laser pulse have been studied theoretically and numerically with a singleelectron model. The results show that the electron dynamics depends sensitively on the initialphase,which results in many remarkable phase-sensitive characteristics of radiation from an electronin an intense few-cycle laser pulse.2. The spatial and spectral characteristics of radiation from an electron driven by a few-cyclelaser pulse have been studied theoretically and numerically with a single electron model based onthe classical radiation theory. The results show that most of the radiation is accumulated in a sharpcone centered in the backscattering direction.It is discovered that the shorter the duration of thefew-cycle pulse is, the wider the backward scattering spectrum and the weaker intensity of thespectrum are.3. Full spatial emission characteristics of radiation generated from electron oscillations drivenby a linearly polarized few-cycle laser pulse of different intensity have been investigatedtheoretically and numerically using a single electron model. It is discovered that the influence of thelaser pulse intensity and the initial phase on the process of full spatial characteristics of the radiationis apparent for few-cycle laser pulse. These phenomena are primarily governed by the electrondynamics and properties of the linearly polarized few-cycle laser pulse.