High frequency Brillouin scattering in metals and gaseous plasmas
Spontaneous and stimulated Brillouin scattering are studied in metals and gaseous plasmas, for an incident laser frequencyω1 greater than the corresponding plasma frequencyωplin the medium. The calculation of threshold powers for the stimulated scattering in aluminium metal and non-degenerate Al-plasmas shows that their values become quite small asω1 approachesωplFor the case of backward wave scattering we also estimate the critical power above which a temporal instability sets in such media. It is argued that this instability may be one of the factors for anomalously large absorption of high power laser beams in laser-induced plasmas.
Volume 94, 2020
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