Observation of stimulated Raman scattering from 20-psec laser-produced plasmas
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Raman scattering spectra obtained with 20-psec 1.064-m laser pulses incident at 45°on nickel-foil targets show an intensity-dependent red shift relative to the subharmonic of the laser frequency. In conjunction with temperature data deduced from x-ray measurements, the results imply a change from the absolute to the convective instability with increasing intensity. The observation of Raman scattering is correlated with the appearance of a high-energy tail in the x-ray spectrum above 100 keV.
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Physical Review Letters