Self-focusing of super-Gaussian laser beam inmagnetized plasma under relativistic and ponderomotive regime

Gill, Tarsem Singh; Kaur, Ravinder; Mahajan, Ranju

doi:10.1016/j.ijleo.2015.05.031

Cited by 33 publications

(7 citation statements)

References 63 publications

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“…As a result, the magnetic field strengthens the self-focusing of the laser beam in the plasma [23]. The self-focusing of an intense laser beam into a magnetized plasma has been investigated in various studies with relativistic/ponderomotive nonlinearity, where various profiles of laser beams such as Gaussian [24], super Gaussian [25,26], hollow Gaussian [27], q-Gaussian [28], Hermite-Gaussian [30] etc. have been used.…”

Section: Introductionmentioning

confidence: 99%

Effect of an external magnetic field on the self-focusing of a cosh-Gaussian laser beam in plasma under the relativistic-ponderomotive effect

Purohit

2023

Opt Quant Electron

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This work presents an analytical and numerical study of the relativistic-ponderomotive effect on self-focusing of an intense cosh-Gaussian laser beam in a collisionless magnetized plasma by considering an external magnetic field in the direction of propagation of the laser beam. The nonlinear differential equation for the beam width parameter/intensity of a cosh-Gaussian laser beam in a magnetized plasma is obtained by Wentzel-Kramers-Brillouin (WKB) and paraxial-ray approximations. The self-focusing of the cosh-Gaussian beam at different values of the magnetic field parameter is investigated. The results have also been compared to relativistic nonlinearity.The results show that the self-focusing effect of cosh-Gaussian beam in magnetized plasma becomes stronger, when relativistic and ponderomotive nonlinearities acts together. In addition, the self-trapping of cosh-Gaussian beam in magnetized plasma has also been studied. Numerical results are presented for the well-established laser and plasma parameters.

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Section: Introductionmentioning

confidence: 99%

Effect of an external magnetic field on the self-focusing of a cosh-Gaussian laser beam in plasma under the relativistic-ponderomotive effect

Purohit

2023

Opt Quant Electron

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“…Nevertheless, various profiles of laser beams such as super Gaussian beams (Gill et al 2015), elliptic Gaussian beams (Gaur et al 2018), Hermite-Gaussian beams (Wadhwa and Singh 2020), hollow Gaussian beams (Purohit et al 2016), Hermite-cosh-Gaussian laser beams (Belafhal and Ibnchaikh 2000), and q-Gaussian beams (Yadav et al 2020) have been used in a few studies of self-focusing and plasma wave excitation. Such beams having different types of irradiance across their wavefront, which show different features in plasma.…”

Section: Introductionmentioning

confidence: 99%

Direct Electron Acceleration By An Intense Nonparaxial Cosh-Gaussian Laser Beam Driven Electron Plasma Wave in Plasma

Purohit

Gaur²,

Raizada³

et al. 2021

Preprint

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Excitation of electron plasma wave by an intense short laser pulse is relevant to electron acceleration process in laser plasma interactions. In this work, the self-focusing of an intense cosh-Gaussian laser beam in collissionless plasma have been studied in the non-paraxial region with relativistic and ponderomotive nonlinearities. Further, the effect of self-focusing of the cosh-Gaussian laser beam on the excitation of electron plasma wave and on subsequent electron acceleration has been investigated. Analytical expressions for the beam width parameter/intensity of cosh-Gaussian laser beam and the electron plasma wave have been established and solved numerically. The energy of the accelerated electrons has also been obtained. The strong self-focusing of the cosh-Gaussian laser beam in plasmas stimulates a large amplitude electron plasma wave, which further accelerates the electrons. The well-established laser and plasma parameters have been used in numerical computation. The results have been compared with paraxial ray approximation, Gaussian profile of laser beam and only with the relativistic nonlinearity. Numerical results suggest that the focusing of the cosh-Gaussian laser beam, the amplitude of electron plasma wave, and energy gain by electrons increases in non-paraxial region, when relativistic and ponderomotive nonlinearities are simultaneously operative. In addition, it has also been observed that the electron plasma wave is driven more efficiently by a cosh-Gaussian laser beam that accelerates plasma electrons to higher energies.

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“…Hence, propagation characteristics of such beams in linear as well as nonlinear media have been considered both theoretically and experimentally by many authors. Recently, other beam shapes such as q-Gaussian [17,18], super-Gaussian [19], Cosh-Gaussian [20] have drawn attention of several researchers. Analytical reports have been focused on the above-mentioned spatial fields and propagation characteristics, highlighting potential applications such as improved pump lasers with flat top beam shape for more efficient pumping.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear interaction of quadruple Gaussian laser beams with narrow band gap semiconductors

Gupta

Kumar

et al. 2021

J Opt

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This paper presents an investigation on nonlinear propagation of quadruple Gaussian (Q.G) laser beam in narrowband semiconductor (e.g., n-type InSb) plasmas. In the presence of laser beam, the electron fluid in the conduction band becomes relativistic that makes the medium highly nonlinear. As a result the laser beam gets self-focused. Following variational theory approach in W.K.B approximation the numerical solution of the nonlinear Schrodinger wave equation (NSWE) for the field of incident laser beam has been obtained. Particular emphasis is put on dynamical variations of beam spot size and longitudinal phase (Gouy phase). Self-trapping of the laser beam resulting from the dynamical balance between diffraction broadening and nonlinear refraction also has been investigated.

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Self-focusing of super-Gaussian laser beam inmagnetized plasma under relativistic and ponderomotive regime

Cited by 33 publications

References 63 publications

Effect of an external magnetic field on the self-focusing of a cosh-Gaussian laser beam in plasma under the relativistic-ponderomotive effect

Effect of an external magnetic field on the self-focusing of a cosh-Gaussian laser beam in plasma under the relativistic-ponderomotive effect

Direct Electron Acceleration By An Intense Nonparaxial Cosh-Gaussian Laser Beam Driven Electron Plasma Wave in Plasma

Nonlinear interaction of quadruple Gaussian laser beams with narrow band gap semiconductors

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