Relativistic self-focusing of intense laser beam in thermal collisionless quantum plasma with ramped density profile

S Zare,R Sadighi-Bonabi,E Yazdani,A Anvari,S Rezaee

doi:10.1103/physrevstab.18.041301

Abstract

Propagation of a Gaussian x-ray laser beam has been analyzed in collisionless thermal quantum plasma with considering a ramped density profile. In this density profile due to the increase in the plasma density, an earlier and stronger self-focusing effect is noticed where the beam width oscillates with higher frequency and less amplitude. Moreover, the effect of the density profile slope and the initial plasma density on the laser propagation has been studied. It is found that, by increasing the initial density and the ramp slope, the laser beam focuses faster with less oscillation amplitude, smaller laser spot size and more oscillations. Furthermore, a comparison is made among the laser self-focusing in thermal quantum plasma, cold quantum plasma and classical plasma. It is realized that the laser self-focusing in the quantum plasma becomes stronger in comparison with the classical regime.

Highlights

The construction of compact ultraintense and ultrashort laser pulses has become feasible by the chirped pulse amplification technique
The self-focusing of an intense laser beam in the classical plasma and in the cold quantum plasma has been studied by considering different plasma density profiles [49,50,51,52]
In the quantum model, the oscillation amplitude of the laser beam width is slightly larger than the classical case; this is due to the diffraction effect in the quantum plasma regime and disregarding some instability effects in the classical plasma model

Summary

INTRODUCTION

The construction of compact ultraintense and ultrashort laser pulses has become feasible by the chirped pulse amplification technique. During the propagation of the laser beam in the quantum plasma, the laser spot size oscillates with higher frequency and less amplitude resulting in stronger laser self-focusing in comparison with the one in the classical regime [43,44,45]. The self-focusing of an intense laser beam in the classical plasma and in the cold quantum plasma has been studied by considering different plasma density profiles [49,50,51,52]. Laser self-focusing in the warm quantum plasma is reported by Habibi et al [54], some parameters such as Fermi temperature and plasma density dimension are ignored. In this paper, based on the defined plasma parameters, a ramped density profile is considered and the propagation of a relativistic Gaussian x-ray laser beam in the thermal collisionless quantum plasma is investigated. The self-focusing effect in the thermal quantum plasma, the cold quantum plasma and the classical plasma is compared

THEORY

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CONCLUSION