Abstract
Measurements are reported of short-pulse (100 psec), 1.06-\ensuremath{\mu}m laser backscatter from a high-pressure nitrogen gas target. Spectral measurements clearly show the expected Brillouin red shift. The backscatter fraction saturated at \ensuremath{\sim}40% at 2\ifmmode\times\else\texttimes\fi{}${10}^{15}$ W/${\mathrm{cm}}^{2}$ and what appears to be multiple Brillouin scattering in a long-gradient-length plasma is observed.
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