Observation of Forward Raman Scattering in Laser-Produced Plasmas

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Abstract
We report the first observation of up-shifted scattered light from Raman forward scattering. Computer simulations show this scattering to be a characteristic signature of that instability. The up- and down-shifted spectra are in good agreement with the interpretation of anti-Stokes and Stokes waves, respectively. We have correlated the observations of both the up-shifted and down-shifted forward spectra with the theoretically expected superhot electrons. The experiments used the Nova laser facility to irradiate thin CH targets with 1-nsec pulses of 0.53-μm light.