Enhanced self-focusing of Laguerre-Gaussian laser beam in relativistic plasma under exponential plasma density transition

Kant, Niti; Thakur, Vishal

doi:10.1016/j.cjph.2021.01.003

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…The parameter ρ = r 0 ω/c represents the normalized spot, Ω = ω p0 /ω and P 0 = αE.E * represent other intensity parameters. A plasma density ramp, n(ξ) = n 0 exp(ξ/d) is considered to modify the equation ( 14) for an early self focusing [10]. A Gaussian density plasma was defined for a collision-less expansion [11].…”

Section: Self-focusing Of Lgl Beammentioning

confidence: 99%

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Self-focusing of low order LG laser beam in Gaussian plasma

Ghotra¹,

Singh²

2023

Laser Phys. Lett.

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Laguerre Gaussian (LG) laser beam propagations is presented to investigate the self-focusing in collision-less Gaussian plasma. This is by deriving the equations supporting self-focusing in plasma mediums by using WKB approximation. Additionally, a range of values of laser-plasma parameters which would fulfil these equations is considered. For the scenario of Gaussian and collision-less plasma, the study is contrasted. By utilizing a low order Laguerre Gaussian laser beam is more exciting as compare to using a Gaussian laser because it incorporates the propagation specific characters of Laguerre Gaussian Laser Beam. The observations are appeared in term of early self-focusing with LG laser beam. The investigation is expected to unfold the new and more effective scenario for self-focusing in plasma.

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Section: Self-focusing Of Lgl Beammentioning

confidence: 99%

“…This enables the particles of the plasma to move at relativistic speeds in dense plasma. In a recent study, self-focusing of LGL beams is enhanced by utilizing relativistic plasma under consideration of density transitions exponentially [10]. Plasma density transition can also be in terms of Gaussian density variations [11].…”

Section: Introductionmentioning

confidence: 99%

Self-focusing of low order LG laser beam in Gaussian plasma

Ghotra¹,

Singh²

2023

Laser Phys. Lett.

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“…In this work, we investigate the more fundamental processes of relativistic self-focusing and selfcompression of LG beams in dense plasma, where the nonlinear effects associated with ponderomotive force, relativistic electron mass increase, as well as electron plasma wave excitation and electron acceleration are involved. Self-focusing of LG beams has been studied previously both numerically and experimentally in Kerr media [19,20], with a key result being the filamentation of the beam based on the input power, and seeded by inhomogeneities in the beam or medium [21]. The physical principles of self compression of LG beams are essentially the same as self-compression for PG beams, however the altered transverse profile means the interaction proceeds quite differently.…”

Section: Introductionmentioning

confidence: 99%

Self-focusing, compression and collapse of ultrashort weakly-relativistic Laguerre–Gaussian lasers in near-critical plasma

Wilson

Sheng²,

McKenna³

et al. 2023

J. Phys. Commun.

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Simultaneous self-focusing and compression of ultrashort weakly-relativistic Laguerre-Gaussian laser pulses in dense plasma is investigated theoretically and numerically. A simple theoretical model is developed and used to identify parameter regimes of interest, and then three-dimensional particle-in-cell simulations are carried out to examine the physics in detail. Rapid self-focusing and compression are observed, leading to pulse collapse even for laser pulse energy at the ten millijoule level. Long-lived ring-shaped post-soliton structures are left at the location of the first collapse, and the residual laser energy is scattered into the plasma. Filamentation and re-focusing occur beyond this point, the structure of which depends on the beam parameters but is observed to be only weakly dependent upon the mode of the laser. Circularly-polarised light is found to produce particulary symmetric plasma density structures. In all cases, bursts of MeV electrons with thermal-like spectra are observed at points of collapse.

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Optical guiding of intense Hermite–Gaussian laser beam in preformed plasma channel and second harmonic generation

Wadhwa¹,

Singh²

2021

Opt Quant Electron

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This work presents the scheme of optical channeling of the intense Hermite Gaussian laser beam and second-harmonic generation in plasma having the preformed plasma channel, where relativistic nonlinearity is operative. Excitation of the electron plasma wave at the incident beam frequency leads its coupling with the latter produces the second harmonics of the beam. For the formulation of differential equations for the beam waists of the Hermite Gaussian laser beam propagating through the channel, the method of moments has been used. The solutions of the coupled differential equations are found using Runge Kutta fourth-order numerical method. Perturbation theory has been applied to find the equation governing the excitation of electron plasma wave and hence the source term for the second-harmonic yield. It has been observed that the preformed plasma channel helps to optically guide the laser beam and enhances the efficiency of second-harmonic generation of various modes of the Hermite Gaussian laser beam in plasma.

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Enhanced self-focusing of Laguerre-Gaussian laser beam in relativistic plasma under exponential plasma density transition

Cited by 14 publications

References 23 publications

Self-focusing of low order LG laser beam in Gaussian plasma

Self-focusing of low order LG laser beam in Gaussian plasma

Self-focusing, compression and collapse of ultrashort weakly-relativistic Laguerre–Gaussian lasers in near-critical plasma

Optical guiding of intense Hermite–Gaussian laser beam in preformed plasma channel and second harmonic generation

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