Self-focusing of circularly polarized laser pulse in the hot magnetized plasma in the quasi-neutral limit

2012 ◽  
Vol 19 (11) ◽  
pp. 112304 ◽  
Author(s):  
N. Sepehri Javan ◽  
Zh. Nasirzadeh
Keyword(s):  
Laser Pulse ◽  
Magnetized Plasma ◽  
Circularly Polarized ◽  
Self Focusing

Self-focusing of laser pulse propagating in magnetized plasma

Optik ◽  
2010 ◽  
Vol 121 (18) ◽  
pp. 1680-1683 ◽  
Author(s):  
Han Xiong ◽  
San-qiu Liu ◽  
Jing-jing Liao ◽  
Xiao-lan Liu
Keyword(s):  
Laser Pulse ◽  
Magnetized Plasma ◽  
Self Focusing

Nonlinear interaction of intense left- and right-hand polarized laser pulse with hot magnetized plasma

2017 ◽  
Vol 83 (4) ◽  
Author(s):  
M. Abedi-Varaki ◽  
S. Jafari
Keyword(s):  
Magnetic Field ◽  
Laser Pulse ◽  
Plasma Temperature ◽  
Spot Size ◽  
Magnetized Plasma ◽  
Laser Spot Size ◽  
Self Focusing ◽  
Right Hand ◽  
Left And Right ◽  
Oblique Magnetic Field

In this article, self-focusing of an intense circularly polarized laser pulse in the presence of an external oblique magnetic field in hot magnetized plasma, using Maxwell’s equations and the relativistic fluid momentum equation, is studied. An envelope equation governing the spot size of the laser beam for both of left- and right-hand polarizations has been derived and the effects of the plasma temperature and oblique magnetic field on the electron density distribution of hot plasma with respect to variation of the normalized laser spot size has been investigated. Numerical results depict that in right-hand polarization, self-focusing of the laser pulse along the propagation direction in hot magnetized plasma becomes better and more compressed with increasing $\unicode[STIX]{x1D703}$. Inversely, in left-hand polarization, increase of $\unicode[STIX]{x1D703}$ in an oblique magnetic field leads to enhancement of the spot size and reduction self-focusing. Besides, in the plasma density profile, self-focusing of the laser pulse improves in comparison with no oblique magnetic field. Also it is shown that plasma temperature has a key role in the laser spot size, normalized laser output power and the variation of plasma density.

scholarly journals Relativistic and ponderomotive self-focusing of a laser pulse in magnetized plasma

2012 ◽  
Vol 30 (4) ◽  
pp. 659-664 ◽  
Author(s):  
Anamika Sharma ◽  
V.K. Tripathi
Keyword(s):  
Laser Pulse ◽  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Beam Width ◽  
Laser Frequency ◽  
Electron Cyclotron ◽  
The Self ◽  
Magnetized Plasma ◽  
Electron Cyclotron Frequency ◽  
Self Focusing

AbstractThe self-focusing of an intense right circularly polarized Gaussian laser pulse in magnetized plasma is studied. The ions are taken to be immobile and relativistic mass effect is incorporated in both the plasma frequency (ωp) and the electron cyclotron frequency (ωc) while determining the ponderomotive force on electrons. The ponderomotive force causes electron expulsion when the effective electron cyclotron frequency is below twice the laser frequency. The nonlinear plasma dielectric function due to ponderomotive and relativistic effects is derived, which is then employed in beam-width parameter equation to study the self-focusing of the laser beam. From this, we estimate the importance of relativistic self-focusing in comparison with ponderomotive self-focusing at moderate laser intensities. The beam width parameter decreases with magnetic field indicating better self-focusing. When the laser intensity is very high, the relativistic gamma factor can be modeled as ${\rm \gamma} = 0.8\left({{{{\rm \omega} _c } / {\rm \omega} }} \right)+ \sqrt {1 + a_0^2 }$γ=0.8(ωc/ω)+1+a02 where ω and a0 are the laser frequency and the normalized laser field strength, respectively. The cyclotron effects on the self-focusing of laser pulse are reduced at high field strengths.

scholarly journals Effect of super-thermal ions and electrons on the modulation instability of a circularly polarized laser pulse in magnetized plasma

2015 ◽  
Vol 33 (2) ◽  
pp. 265-272 ◽  
Author(s):  
R. Etemadpour ◽  
N. Sepehri Javan
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Laser Pulse ◽  
Modulation Instability ◽  
Fluid Model ◽  
Magnetized Plasma ◽  
Effect Of Temperature ◽  
Circularly Polarized ◽  
Relativistic Fluid ◽  
Right Hand

AbstractThe modulation instability of a circularly polarized laser pulse in a magnetized non-Maxwellian plasma is investigated. Based on a relativistic fluid model, the nonlinear interaction of an intense circularly polarized laser beam with a non-Maxwellian magnetized plasma is described. Nonlinear dispersion relation and growth rate of the instability for left- and right-hand polarizations are derived. The effect of temperature, external magnetic field, value of Kappa and state of polarization on the growth rate are analyzed. It is shown that the growth rate increases with increase in the magnetic field for the right-hand polarization and inversely it decreases for the left-hand one. Also it is observed that existence of super-thermal particles causes the decrease in the growth.

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