Weakly relativistic and ponderomotive effects on self-focusing and self-compression of laser pulses in near critical plasmas

Bokaei, B.; Niknam, A. R.

doi:10.1063/1.4898057

Cited by 18 publications

(6 citation statements)

References 35 publications

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“…Hence, after a certain laser intensity threshold (upper-limit), the beam starts to defocus. [37] By compressing the laser pulse, the laser intensity goes up and reaches the upper-limit, as a result the beam diverges. This is due to the fact that the magnetic field modifies the refractive index of plasma to intensify the nonlinear effects.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…[11−16] The effect of selfcompression mechanism on the self-focusing of a Gaussian laser beam in an unmagnetized plasma has already been investigated by Bokaei and Niknam. [17] They have shown in their work that in the presence of ponderomotive nonlinearity the self-focusing mechanism is obstructed by the self-compression one. Shibu et al [14] have investigated the self-compression of Gaussian laser beam due to the relativistic mass nonlinearity and have observed that the self-focusing mechanism interferes strongly with the non-linear self-compression process.…”

Section: Introductionmentioning

confidence: 99%

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Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

Vij¹,

Aggarwal²

2018

Commun. Theor. Phys.

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This paper presents an investigation of self-focusing of a quadruple Gaussian laser beam in collisionless magnetized plasma. The nonlinearity due to ponderomotive force which arises on account of nonuniform intensity distribution of the laser beam is considered. The nonlinear partial differential equation governing the evaluation of complex envelope in the slowly varying envelope approximation is solved using a paraxial formalism. The self-focusing mechanism in magnetized plasma, in the presence of self-compression mechanism will be analyzed in contrast to the case in which it is absent. It can be observed that, in case of ponderomotive nonlinearity, the self-compression mechanism obstructs the pulse self-focusing above a certain intensity value. The effect of an external magnetic field is to generate pulses with smaller spot size and shorter compression length. The lateral separation parameter and the initial intensity of the laser beam play a crucial role on focusing and compression parameters. Also, the three-dimensional analysis of pulse propagation is presented by coupling the self-focusing equation with the self-compression one.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

Vij¹,

Aggarwal²

2018

Commun. Theor. Phys.

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“…(22)- (24). The parameters of the laser pulse and plasma are chosen as below, a 0 ¼ 0.1, s 0 ¼ 100 fs, n 0 ¼ 3 Â 10 21 cm À3 , and x ¼ 5 Â 10 15 rad s À1 .…”

Section: Numerical Investigationmentioning

confidence: 99%

Relativistic laser pulse compression in magnetized plasmas

et al. 2015

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The self-compression of a weak relativistic Gaussian laser pulse propagating in a magnetized plasma is investigated. The nonlinear Schrödinger equation, which describes the laser pulse amplitude evolution, is deduced and solved numerically. The pulse compression is observed in the cases of both left- and right-hand circular polarized lasers. It is found that the compressed velocity is increased for the left-hand circular polarized laser fields, while decreased for the right-hand ones, which is reinforced as the enhancement of the external magnetic field. We find a 100 fs left-hand circular polarized laser pulse is compressed in a magnetized (1757 T) plasma medium by more than ten times. The results in this paper indicate the possibility of generating particularly intense and short pulses.

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“…[18,19] Numerous efforts have been done on the high-intensity laser beam evolution in the plasma. [20][21][22][23][24][25][26][27][28][29] The electromagnetic filamentation instability in the magnetized plasmas taking into account the relativistic electron mass variation and magnetic field perturbations has been studied by Shukla et al [20] Shibu et al have investigated the compression possibility of the laser pulse in a relativistic plasma and observed that the nonlinear self-focusing interferes with the self-compression mechanism. [15] Brandi et al [21] studied the propagation of high-intensity short laser beams in an inhomogeneous plasma.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal dynamics of circularly polarized Gaussian laser pulse in a magnetized plasma

Milani

2022

Contributions to Plasma Physics

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Spatiotemporal evolution of intense circularly polarized Gaussian laser pulse propagating in plasma is investigated. Self-focusing and self-compression properties of the laser pulse are studied, taking into account the ponderomotive nonlinearity, magnetic field, and state of wave polarization effects. The coupled differential equations governing the beam width (in space) and pulse length (in time) parameters are obtained via paraxial ray and Wentze−Kramers−Brillouin approximations and solved numerically. Numerical simulation showed that the pulse is compressed (in time and space) to a significant extent at a different normalized distance due to the effect of the nonlinearity of the medium. It is shown that for the right-hand circularly polarized laser, the strength of both self-focusing and self-compression of the laser pulse along the propagation direction is increased by increasing the value of the magnetic field, and consequently, the normalized intensity of the pulse is enhanced as it propagates through the plasma. In the case of a left-hand circularly polarized laser, an increase in the magnetic field causes a decrease in the strength of both self-focusing and self-compression of the laser pulse, especially in the higher values. To analyse the evolution of the laser spot size, a three-dimensional view of the normalized laser intensity at different points of the distance of propagation has also been plotted. Moreover, the results indicate a specific laser intensity range with a "saturation point" where the compression process reaches its maximum value, and outside of this range, it vanishes.

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Weakly relativistic and ponderomotive effects on self-focusing and self-compression of laser pulses in near critical plasmas

Cited by 18 publications

References 35 publications

Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

Relativistic laser pulse compression in magnetized plasmas

Spatiotemporal dynamics of circularly polarized Gaussian laser pulse in a magnetized plasma

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