Stimulated Raman Scattering of X-Mode Laser in a Plasma Channel

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

doi:10.1155/2021/9919467

Cited by 9 publications

(2 citation statements)

References 47 publications

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“…In the perpendicular geometry, X-wave pump lasers undergo backscattering (Paknezhad 2016; Shi, Qin & Fisch 2017 a ), forward scattering (Hassoon, Salih & Tripathi 2009; Babu et al. 2021), second harmonics generation (Jha et al. 2007) and terahertz radiation generation (Varshney et al.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking magnetised three-wave coupling for laser backscattering: analytic solutions and kinetic simulations

Shi

2023

J. Plasma Phys.

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Understanding magnetised laser–plasma interactions is important for controlling magneto-inertial fusion experiments and developing magnetically assisted radiation and particle sources. For nanosecond pulses at non-relativistic intensities, interactions are dominated by coherent three-wave interactions, whose nonlinear coupling coefficients became known only recently when waves propagate at oblique angles with the magnetic field. In this paper, backscattering coupling coefficients predicted by warm-fluid theory are benchmarked using particle-in-cell simulations in one spatial dimension, and excellent agreements are found for a wide range of plasma temperatures, magnetic field strengths and laser propagation angles, when the interactions are mediated by electron-dominant hybrid waves. Systematic comparisons between theory and simulations are made possible by a rigorous protocol. On the theory side, the initial boundary value problem of linearised three-wave equations is solved, and the transient-time solutions allow the effects of growth and damping to be distinguished. On the simulation side, parameters are carefully chosen and calibration runs are performed to ensure that comparisons are well controlled. Fitting simulation data to analytical solutions yields numerical growth rates that match theory predictions within error bars. Although warm-fluid theory is found to be valid for a wide parameter range, genuine kinetic effects have also been observed.

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Section: Introductionmentioning

confidence: 99%

Benchmarking magnetised three-wave coupling for laser backscattering: analytic solutions and kinetic simulations

Shi

2023

J. Plasma Phys.

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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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