Relativistic longitudinal self-compression of ultra-intense Gaussian laser pulses in magnetized plasma

Abstract

This article presents a preliminary study of the longitudinal self-compression of ultra-intense Gaussian laser pulse in a magnetized plasma, when relativistic nonlinearity is active. This study has been carried out in 1D geometry under a nonlinear Schrodinger equation and higher-order paraxial (nonparaxial) approximation. The nonlinear differential equations for self-compression and self-focusing have been derived and solved by the analytical and numerical methods. The dielectric function and the eikonal have been expanded up to the fourth power of r (radial distance). The effect of initial parameters, namely incident laser intensity, magnetic field, and initial pulse duration on the compression of a relativistic Gaussian laser pulse have been explored. The results are compared with paraxial-ray approximation. It is found that the compression of pulse and pulse intensity of the compressed pulse is significantly enhanced in the nonparaxial region. It is observed that the compression of the high-intensity laser pulse depends on the intensity of laser beam (a0), magnetic field (ω c ), and initial pulse width (τ0). The preliminary results show that the pulse is more compressed by increasing the values of a0, ω c , and τ0.

Influence of non‐uniform magnetic field on relativistic q‐Gaussian laser pulses propagating in magnetized plasmas

“…In the recent years with the advent of high-power lasers, theoretical and experimental studies of the interaction of intense laser pulses with plasmas are active areas of research due to their applications in the fields of plasma wakefields, [1][2][3][4][5][6][7][8] Inertial Confinement Fusion (ICF), [9][10][11] fusion harmonics generation, [12,13] X-ray lasers, [14,15] and laser fusion. [16][17][18] In addition, the interaction of intense laser pulse with plasma can lead to a number of nonlinear effects including, self-focusing, [19][20][21][22][23][24][25] self-compression, [26][27][28] Raman and Brillouin scattering instabilities, [29] as well as modulational and filamentational instabilities. [30][31][32] As is well known, self-focusing is a non-linear optical phenomenon that can occur as a result of intensity-dependent refraction.…”

“…Purohit et al [ 26 ] presented a preliminary study of the longitudinal self‐compression of ultra‐intense Gaussian laser pulse in magnetized plasma when relativistic nonlinearity is active. It was understood that the compression of pulse and pulse intensity of the compressed pulse is significantly enhanced in the non‐paraxial region.…”