Relativistic self-focusing of Laguerre-Gaussian beam in an underdense plasma

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

“…With Gaussian density plasma, the self-focusing is appeared to occur earlier than collision-less plasma. Laguerre-Gaussian laser beam in plasma self-focusing ( f 0 = 0.20) was observed in a collisional-less plasma [8]. However, in our situation, a Gaussian plasma density is introduced to analyze the self-focusing.…”

“…It is inferred equation ( 17) that as P 0 is increased, the beam radius falls quickly until it reaches a definite value, after which the beam radius saturates for high values of P 0 irrespective of Ω. Furthermore, one can see in a plasma of Ω = 0.04, the beams can propagate relativistically, while in a plasma of Ω = 0.1, the radius remains relatively small for the critical condition to be met [8].…”

“…of the plasma, speed of particles of plasma and the interaction between the particles of the plasma [6,7]. The concept of relativistic self-focusing with the Laguerre-Gaussian laser (LGL) beam has been studied in collision-less plasma [8].…”

Investigating pair-production by Breit–Wheeler process in a collisional plasma

“…Till now, up to ∼ 10 25−28 W cm − 2 level laser pulses are not available, but a high-energy electron can experience such huge field while interacting with strong and intense laser pulses. Intense laser beams while propagating in plasma create an ion channel with the transverse focusing field that increases the emittance of the radiated beam [21,22]. During laserplasma interaction, the quiver electrons get accelerated up to relativistic energies over a short distance either by wakefield or by the direct ultra-intense electromagnetic field [23][24][25][26][27].…”