Direct observation of stimulated-Brillouin-scattering detuning by a velocity gradient.

Journal article

We report the first direct evidence of detuning of stimulated Brillouin scattering (SBS) by a velocity gradient, which was achieved by directly measuring the frequency shift of the SBS-driven acoustic wave relative to the local resonant acoustic frequency. We show that in the expanding part of the plasma, ion-acoustic waves are driven off resonance which leads to the saturation of the SBS instability. These measurements are well reproduced by fluid simulations that include the measured flow.

Authors: Froula, D; Divol, L; MacKinnon, A; Gregori, G; Glenzer, S

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 90
• Issue: 15
• Pages: 155003
• Publication date: 2003-04-01
• DOI: 10.1103/physrevlett.90.155003
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English