Abstract
Laser Wakefield is produced by ultra-high intensity laser pulse interacting with underdense plasma with special conditions for the laser wavelength and plasma density. In this mechanism, nonlinear forces appear due to the very high amplitudes of the electromagnetic wave and these forces evacuate plasma electrons from the path of the laser pulse leading to very high electron plasma density gradients. Due to the electrostatic forces which result from these density perturbations, the electrons move very fast in oscillatory manner to restore neutrality creating a wake of electron density perturbations behind the laser pulse. Detailed investigation has been dealt with the time-delay between the driver laser pulse and the probe pulse which can affect the production of high plasma gradients needed for photon acceleration process.
Highlights
High-intensity short-pulse laser-plasma interactions are of much current interest because of their applications [1] [2] [3]
Due to the electrostatic forces which result from these density perturbations, the electrons move very fast in oscillatory manner to restore neutrality creating a wake of electron density perturbations behind the laser pulse
The simulation of the photon acceleration and laser pulse amplification presented with electromagnetic PIC simulation codes, 1d-XOOPIC and 2d OSIRIS observed the frequency up shift photon acceleration simulation after 2 cm of pulse propagated up to 150% in 1d simulation, but only 10% for 2d simulation
Summary
High-intensity short-pulse laser-plasma interactions are of much current interest because of their applications [1] [2] [3]. In 2002 [18], the simulation of the photon acceleration was studied by the interaction between the ultra-short intense laser pulse and the gradient of plasma density, the frequency up shift was observed clearly in 1d simulation and small in 2d simulation. The acceleration of the probe pulse photons was studied by generating a Wakefield behind a short-duration ultra-high-intensity pump pulse propagate in underdense density plasma that was calculated from the wavelength of the laser pulse, compared to the acceleration produced in a reference [18] which used a high-intensity pulse and reference [11] with changed on density of the plasma.
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