# Burst behavior due to quasimode excited by stimulated Brillouin scattering in high-intensity laser-plasma interaction

## TL;DR

This paper explains the low-frequency burst behavior of stimulated Brillouin scattering (SBS) in high-intensity laser-plasma interactions by analyzing the excitation of a quasimode and its competition with ion-acoustic waves, revealing a key saturation mechanism.

## Contribution

It introduces the concept of a quasimode excited by SBS and demonstrates its role in the burst behavior and saturation mechanism in multi-ion species plasmas.

## Key findings

- Quasimode excitation leads to burst behavior in SBS.
- Competition between quasimode and ion-acoustic waves affects SBS saturation.
- The results clarify the mechanism behind low-frequency SBS bursts.

## Abstract

The strong-coupling mode, called quasimode, will be excited by stimulated Brillouin scattering (SBS) in high-intensity laser-plasma interaction. And SBS of quasimode will compete with SBS of fast mode (or slow mode) in multi-ion species plasmas, thus leading to a low-frequency burst behavior of SBS reflectivity. The competition of quasimode and ion-acoustic wave (IAW) is an important saturation mechanism of SBS in high-intensity laser-plasma interaction. These results give a clear explanation to the low-frequency periodic burst behavior of SBS and should be considered as a saturation mechanism of SBS in high-intensity laser-plasma interaction.