Abstract
Keywords
1 Introduction
Backward stimulated Brillouin scattering (SBS), a three-wave interaction process where an incident electromagnetic wave (EMW) decays into a backscattered EMW and a forward propagating ion-acoustic wave (IAW), leads to a great energy loss of the incident laser and is detrimental in inertial confinement fusion (ICF)[
Besides SBS in ICF, the mechanism of SBS in the strong-coupling regime can also be applied to Brillouin amplification[
Many mechanisms for the saturation of SBS have been proposed, including frequency detuning due to particle trapping[
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In this paper, we report the first demonstration that the strong-coupling mode or quasimode is excited by SBS and coexists and competes with the IAW in high-intensity laser–plasma interactions. The competition between SBS of the IAW and SBS of the quasimode leads to a low-frequency burst behavior of SBS reflectivity and decreases the total SBS reflectivity. Therefore, competition between the quasimode and the IAW excited by SBS is an important saturation mechanism of SBS in high-intensity laser–plasma interactions.
2 Theoretical analysis
The wave number of the IAW excited by backward SBS can be calculated by
When strong pump light interacts with plasmas, the strong-coupling mode is generated, which grows with time and is not damped, and is called the quasimode. The strong-coupling regime of SBS is characterized by
Under the condition
3 Numerical simulation
A one dimension in space and one dimension in velocity (1D1V) Vlasov–Maxwell code[
Figure
Theory | Simulation | ||
---|---|---|---|
Mode | |||
Fast mode | 2.7 | 0.9973 | 0.9972 |
Slow mode | 1.9 | 0.9981 | |
Quasimode | 3.8 | 0.9962 | 0.9966 |
Table 1. Frequencies of different modes and the corresponding scattered light. The conditions are
Figure
Figure
The burst period of SBS reflectivity
However, for C plasmas, the Landau damping of the IAW is very low and the gain of the SBS is very high in the condition
Figure
Although the strong damping condition in C plasmas or
4 Discussion
In our work,
In real experiments, other physical processes, such as filamentation instability[
5 Summary
In conclusion, the quasimode is excited by SBS in high-intensity laser–plasma interactions, which competes with the IAW excited by SBS. The competition between SBS of the quasimode and SBS of the fast mode in
References
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