Effects of frequency-modulated pump on stimulated Brillouin scattering in inhomogeneous plasmas

Abstract The effects of a frequency-modulated pump on stimulated Brillouin scattering (SBS) in a flowing plasma are investigated by theoretical analysis, three-wave simulations, and kinetic simulations. The resonance point of SBS oscillates in a certain spatial region with time when frequency modula...

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Bibliographic Details
Published in:Plasma physics and controlled fusion 2023-12, Vol.65 (12), p.125002
Main Authors: Chen, Y, Zheng, C Y, Liu, Z J, Cao, L H, Xiao, C Z
Format: Article
Language:English
Subjects:
frequency modulations
inhomogeneous plasmas
stimulated Brillouin scattering
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Summary:Abstract The effects of a frequency-modulated pump on stimulated Brillouin scattering (SBS) in a flowing plasma are investigated by theoretical analysis, three-wave simulations, and kinetic simulations. The resonance point of SBS oscillates in a certain spatial region with time when frequency modulations are applied. There exists a certain frequency modulation that causes the velocity of resonant points to be similar to the group velocity of the seed laser, which increases the SBS reflectivity. The SBS can also be suppressed by frequency modulation with larger bandwidth. In the kinetic simulations, the effects of the frequency-modulated pump on the reflectivity agree with our theoretical predictions. Multi-location autoresonance is also observed in the narrow-bandwidth frequency modulation case, which can also increase the SBS reflectivity. Our work provides a method for selecting the laser bandwidth to inhibit SBS in inhomogeneous plasmas.
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/ad02bd