Increasing the upper-limit intensity in relativistic and ponderomotive self-focusing by using plasma with a linear electron temperature ramp

Bokaei, B.; Niknam, A. R.; Milani, M. R. Jafari

doi:10.1088/0963-0252/23/6/064011

Cited by 11 publications

(4 citation statements)

References 33 publications

(47 reference statements)

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“…Moreover, this treatment introduces a turning point for laser intensity value (here 3 × 10 15 W/cm 2 ) where the self-compression is observed to the maximum extent. Both specific range and the turning point for laser intensity are observed, in similarity with previous analyses [25,37] performed for the self-focusing process. Physically, this behaviour may be linked with depletion of the electron density in the axial region, so that the larger or smaller gradient of dielectric permittivity (∇𝜀 ∝ 𝜀 𝜏 ), which is responsible for the pulse compression, is obtained.…”

Section: (B)supporting

confidence: 87%

“…[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%

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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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Section: (B)supporting

confidence: 87%

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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“…Thus we think that the deformations in Figs. 5(ii) and 5(iii) may be caused by the modulational instability. Moreover, the fact that the increase of L with ω > 3.83 displayed in Figs.…”

Section: Propagation Dynamics and Stability Of Em Solitary Wave By Pi...mentioning

confidence: 99%

“…The nonlinear interaction between an intense electromagnetic (EM) pulse and plasmas is of great interest in various fundamental research and technological applications, including harmonic generation, [1][2][3] self-focusing, [4][5][6] wakefield generation, [7,8] relativistic optical guiding, [9][10][11] x-ray, [12] laser pulse frequency shifting, [13] pulse compression, [14] relativistic EM soliton propagation. [15][16][17][18][19] Among spectacular phenomena in nonlinear interactions, relativistic EM solitary waves have attracted a great deal of attention in a fundamental point of view, also due to their possible applications in inertial confinement fusion and the charged particle acceleration.…”

Section: Introductionmentioning

confidence: 99%

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Tang¹,

Liu²,

Hong³

et al. 2021

Chinese Phys. B

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By one-dimensional particle-in-cell (PIC) simulations, the propagation and stability of relativistic electromagnetic (EM) solitary waves as well as modulational instability of plane EM waves are studied in uniform cold electron-ion plasmas. The investigation not only confirms the solitary wave motion characteristics and modulational instability theory, but more importantly, gives the following findings. For a simulation with the plasma density 1023 m−3 and the dimensionless vector potential amplitude 0.18, it is found that the EM solitary wave can stably propagate when the carrier wave frequency is smaller than 3.83 times of the plasma frequency. While for the carrier wave frequency larger than that, it can excite a very weak Langmuir oscillation, which is an order of magnitude smaller than the transverse electron momentum and may in turn modulate the EM solitary wave and cause the modulational instability, so that the solitary wave begins to deform after a long enough distance propagation. The stable propagation distance before an obvious observation of instability increases (decreases) with the increase of the carrier wave frequency (vector potential amplitude). The study on the plane EM wave shows that a modulational instability may occur and its wavenumber is approximately equal to the modulational wavenumber by Langmuir oscillation and is independent of the carrier wave frequency and the vector potential amplitude. This reveals the role of the Langmuir oscillation excitation in the inducement of modulational instability and also proves the modulational instability of EM solitary wave.

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Self focusing and axial phase modulation of laser beams carrying orbital angular momentum in collisionless plasmas

Gupta

2021

Opt Quant Electron

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Increasing the upper-limit intensity in relativistic and ponderomotive self-focusing by using plasma with a linear electron temperature ramp

Cited by 11 publications

References 33 publications

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

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

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Self focusing and axial phase modulation of laser beams carrying orbital angular momentum in collisionless plasmas

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