Relativistic laser self-focusing in a plasma with transverse magnetic field

Hassoon, Khaleel I.; Sharma, A. K.; Khamis, Raad A.

doi:10.1088/0031-8949/81/02/025505

Cited by 23 publications

(8 citation statements)

References 21 publications

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“…The relativistic factor  in Eq. (3) refers to the variation of the dielectric constant due to the increase in the electron mass at relativistic case is given by [36]…”

Section: Relativistic Self Focusing Of X-mode Laser Beammentioning

confidence: 99%

Study of Terahertz Generation in Magnetized Plasma Via Self Focused Ultra-Relativistic Laser Beam

Singh¹,

Hassan²,

Janabi³

et al. 2016

IOSR

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The paper presents a theoretical model for terahertz (THz) radiation generation at the difference frequency of two waves namely x-mode laser and upper hybrid wave (UHW). By considering relativistic nonlinearity, filamentation (self focusing) of x-mode laser propagating perpendicular to the direction of ambient magnetic field in plasma is first investigated. This resulting localized beam interacts with the UHW to produce a nonlinear current at the THz frequency range. The differential equation for beam-width parameter is obtained by using the dielectric function within the paraxial ray approximations. Subsequently, an expression for THz electric field is derived by including the effect of relativistic self-focusing of pump laser. Our analytical and numerical calculations show that the relativistic self focusing and magnetic field play a crucial role to enhance the THz radiation generation.

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“…The relativistic factor  in Eq. (3) refers to the variation of the dielectric constant due to the increase in the electron mass at relativistic case is given by [36]…”

Section: Relativistic Self Focusing Of X-mode Laser Beammentioning

confidence: 99%

Study of Terahertz Generation in Magnetized Plasma Via Self Focused Ultra-Relativistic Laser Beam

Singh¹,

Hassan²,

Janabi³

et al. 2016

IOSR

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show abstract

“…where e, m 0 , and ω ce = eB 0 m 0 c are the electronic charge, rest mass of electron, and the electron-cyclotron frequency, respectively, and [20], the relativistic factor γ will be…”

Section: Relativistic Self-focusing Of the Laser Beammentioning

confidence: 99%

Terahertz generation by the high intense laser beam

et al. 2012

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The terahertz (THz) frequency radiation produced as a result of nonlinear interaction of high intense laser beam with low-density ripple in collisionless magnetoplasma has been studied under the paraxial ray approximation. The relativistic change of electron mass leads to self-focusing of laser beam when the initial power of laser beam is greater than its critical power. The self-focused laser beam couples with the pre-existing density ripple to produce a nonlinear current driving the THz radiation at different frequency. The applied magnetic field enhances the nonlinear coupling efficiency. Appropriate expressions for the beam width parameter of the laser beam and the electric vector of the THz wave have been evaluated. Theory and numerical simulations show that this THz source is capable of providing power of Giga watt level.

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“…Following Hassoon et al (2010), we obtain an equation including two terms of the dielectric constant, the linear and the nonlinear term where:…”

Section: Nonlinear Permittivity Tensormentioning

confidence: 99%

Relativistic self-focusing of super-Gaussian laser beam in plasma with transverse magneticfield

et al. 2012

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This paper presents an investigation of a self-consistent, theoretical model, which explains the ring formation in a superGaussian laser beam propagating in plasma with transverse magnetic field, characterized by relativistic nonlinearity. Higher order terms (up to r 4 ) in the expansion of the dielectric function and the eikonal have been taken into account. The condition for the formation of a dark and bright ring has been used to study focusing/defocusing of the beam. It is seen that inclusion of higher order terms does significantly affect the dependence of beam width parameter on the distance of propagation. Self-focusing of super-Gaussian beam is studied at various values of super-Gaussian coefficient, m and magnetic field. Further, we have studied some distinct features of critical power curves for varying values of magnetic field.

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Relativistic laser self-focusing in a plasma with transverse magnetic field

Cited by 23 publications

References 21 publications

Study of Terahertz Generation in Magnetized Plasma Via Self Focused Ultra-Relativistic Laser Beam

Study of Terahertz Generation in Magnetized Plasma Via Self Focused Ultra-Relativistic Laser Beam

Terahertz generation by the high intense laser beam

Relativistic self-focusing of super-Gaussian laser beam in plasma with transverse magneticfield

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