Self-focusing/Defocusing of Hermite-Sinh-Gaussian Laser Beam in Underdense Inhomogeneous Plasmas

Abstract

The self-focusing/defocusing of Hermite-sinh-Gaussian (HshG) laser beam in underdense inhomogeneous plasmas is studied by using higher-order approximation theory. It is found that Hermite mode index and the fluctuation of the periodic plasma density have a significant effect on the dielectric constant and laser beam self-focusing/self-defocusing. With the increase of mode index, the high-order HshG laser beam is beneficial to suppress self-focusing and enhance self-defocusing. In addition, the effects of decentered parameters, beam intensity, and plasma non-uniformity on self-focusing/self-defocusing are discussed.

Electron acceleration influenced by sinh-Gaussian laser pulses in a prepared ion channel

“…Figure 1 reflects the intensity distribution, spatial distribution of the axial and transverse electric field for a shG laser beam in terms of decentred parameter. It is demonstrated that the decentered parameter clearly affects beam width [29].…”

Self-focusing of a q-gaussian laser beam under the influence of an exponential plasma density ramp in plasma

“…Due to a wide range of potential applications, including laser-driven acceleration, x-ray lasers, harmonic generation, etc, the self-focusing of a powerful laser beam has drawn tremendous interest in the last few decades [1][2][3][4][5][6]. The propagation of powerful laser pulses > I W c m 10 17 2 ( ) / in extremely dense plasmas has seen a sudden spike in demand as a result of the rapid igniter concept for inertial confinement fusion [7].…”

“…When a laser beam interacts with plasma, the plasma dielectric constant is adjusted, allowing the electron an oscillatory velocity [11]. Due to the significance of these applications, the non-linear phenomenon (selffocusing) has been explored by various researchers [3,6,7,[10][11][12][13][14][15][16][17][18]. In addition to that Studying the self-focusing of q-Gaussian beams is important for optimizing the design and performance of high-power laser systems, as well as for developing more efficient and effective laser-plasma interaction systems.…”

“…2 They noticed that intense minimal ray self-convergence affects the formation of ring-shaped laser intensity profiles in a very brief Rayleigh length [17]. Sharma et al [6] later used a similar method to explore the thermal self-focusing of the laser in collisional plasma beyond the near-axis approximation. They claim that the self-focusing range improves with laser power.…”