Study of coexisting stimulated Raman and Brillouin scattering at relativistic laser power

Abstract

This paper presents a model to study the stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) simultaneously at relativistic laser power. At high intensity, the relativistic mass correction for the plasma electrons becomes significant and the plasma refractive index gets modified which leads to the relativistic self-focusing of the pump beam. This filamentation process affects the scattering processes (SRS and SBS) and at the same time the pump filamentation process also gets modified in the presence of the coexisting SRS and SBS due to the pump depletion. We have also demonstrated that the pump depletion and relativistic filamentation affects the back-reflectivity of scattered beams (SRS and SBS) significantly, for the coexistence case.

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

“…Stimulated Raman scattering (SRS) is an important parametric instability in plasmas. In stimulated Raman forward scattering (SRFS), a high phase velocity Langmuir wave is produced that can accelerate electrons to high energy [25][26][27][28][29][30][31][32][33][34][35]. In stimulated Raman backward scattering (SRBS), electron plasma wave (EPW) has smaller phase velocity and can cause bulk heating of electrons.…”

Study of crossed-beam energy transfer process with large crossing angle in three-dimension

“…If the beat wave driven by a couple of two beams satisfies the dispersion relation of the ion-acoustic waves, energy transfers between the crossed beams through a three-wave coupling process (McKinstrie et al, 1996). This phenomenon, which is commonly named crossed-beam energy transfer (CBET), is a very important process because of its influence on the capsule implosion symmetry (Kruer et al, 1996) and other laser-plasma interaction (LPI) instabilities, such as stimulated Raman scattering (SRS) and simulated Brillouin scattering (SBS) (Karttunen & Salomaa, 1992;Kline & Montgomery, 2005;Sharma et al, 2009Sharma et al, , 2012Huller & Porzio, 2010;Hao et al, 2012;Vyas et al, 2014). During the latest decades, many experimental works about CBET have been carried out on the Nova and the Omega laser facilities (Wharton et al, 1998;Kirkwood et al, 2002).…”