Abstract
The calorimetric and spectral behavior of second-harmonic light emitted from CO2 laser-produced plasmas in backscatter and near the specular angle is difficult to reconcile with electron Langmuir-ion acoustic wave parametric decay. Resonance absorption and subsequent frequency doubling cannot be excluded, but any model including them is much more complicated than can be supported by the data. Rather, the observed small, angle-dependent frequency shifts of second harmonic light correlate with the frequency shifts of Brillouin scatter at those angles. This suggests that the frequency upconversion is done in regions of the plasma with strong ion acoustic density fluctuations, likely produced by Brillouin scatter.
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