Decay instability of X-mode laser into upper hybrid and electron Bernstein waves in a plasma

Babu, Sanjay; Jeet, Ram; Kumar, Arvind; Kumar, Asheel; Varma, Ashish

doi:10.1007/s11082-022-04090-z

Cited by 11 publications

(1 citation statement)

References 45 publications

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“…The nonlinear interaction of laser beams with plasma as well as nanoclustered plasma is a fascinating research field due to its several applications, such as anomalous absorption [1], parametric decay process [2][3][4][5], harmonic generation [6,7], charged particle acceleration [8,9], terahertz radiation generation [10] electron heating [11][12][13] and soft x-ray generation [14]. Plasma is a good candidate as an interacting medium and promises large current generation via laser interaction.…”

Section: Introductionmentioning

confidence: 99%

Electron Bernstein wave aided Hermite cosh-Gaussian laser beam absorption in collisional plasma

Varma¹,

Mishra²,

Kumar³

et al. 2023

Laser Phys. Lett.

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In this paper, we theoretically study the electron Bernstein wave aided Hermite-Cosh-Gaussian laser beam absorption in collisional plasma with a static magnetic field. This laser beam may have the potential to couple the pre-existing electron Bernstein wave with the coupled wave frequency ω 1 = ω + ω 0 and wave number k 1 = k + k 0 where ω and ω 0 are the electron Bernstein wave and laser beam frequencies, respectively, and k and k 0 are the electron Bernstein wave and laser beam wave numbers, respectively. The plasma electron oscillatory velocities associated with the coupled wave mode produce the linear and nonlinear current density. An expression for the nonlinear absorption coefficient of an electron Bernstein wave aided Hermite cosh-Gaussian laser beam is analytically derived and more concisely discussed via different relative graphs. The graphical results promise that the absorption coefficient is strongly dependent on Hermite mode index m, beam decentered parameter d associated with the cosh term, laser beam width, laser beam frequency, electron Bernstein wave frequency, electron cyclotron frequency, electron thermal velocity and collisional frequency. Nonlinear coupling, collision phenomena and laser beam decentered parameter (very sensitive parameter) play an important role in absorption processes. The association of a very small electron Bernstein wave frequency with the laser beam causes too much of an increase in the absorption coefficient compared to only the laser beam. This efficient nonlinear absorption process may be applicable to plasma electron heating and the harmonic generation process.

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