Strong self-focusing of an intense cosh-Gaussian laser beam in magnetized plasma under relativistic effect

Purohit, Gunjan; Raizada, Amita

doi:10.1007/s12596-022-01043-3

Cited by 3 publications

(1 citation statement)

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“…Furthermore, the effect of beating of two cosh-Gaussian laser beams on the excitation of UHW and electron acceleration have been investigated. Cosh-Gaussian laser beams ((decentered Gaussian beams)) are taken in this study because they have higher power and earlier focusing ability than Gaussian beams [29][30][31][32][33][34]. These beams can be produced in the laboratory by the superposition of two diffracted Gaussian laser beams having the same spot size and being in phase with each other [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effect of mutual interaction of two cosh-Gaussian laser beams on upper hybrid wave excitation and subsequent electron acceleration

Purohit

2024

Phys. Scr.

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This paper presents the excitation of an upper hybrid wave by resonant excitation of two intense cosh-Gaussian laser beams of frequencies ω1 and ω2 in a collisionless plasma. The excited upper hybrid wave is used for electron acceleration which accelerates the electrons towards higher energy. The acceleration of electrons through an excited upper hybrid wave has also been studied. This study has been analysed using the Wentzel Kramers Brillouin (WKB) and paraxial-ray approximation, where relativistic and ponderomotive nonlinearities are employed together. Analytical expressions for the beam width/intensity of the cosh-Gaussian laser beams, the electric field/power of the excited upper hybrid wave and the electron acceleration have been derived, which have been solved numerically for an established set of laser and plasma parameters. The results are also compared to relativistic nonlinearity. It has been observed that the mutual interaction of two cosh-Gaussian laser beams at a difference frequency significantly affects the self-focusing of each beam, leading to an increase in the amplitude/power of the upper hybrid wave as well as energy gain by the electrons. The effect of the magnetic field (ωc) and decentered parameter (b) on the power of the excited upper hybrid wave and the energy gain by the electrons are also explored. The results show that the power of upper hybrid wave and the energy gain by the electrons increase at higher values of b and ωc.

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