Abstract
Observations of stimulated Raman backscatter in an underdense hydrogen plasma are reported. The wavelength shift associated with the backscattered Raman component is consistent with a plasma with the measured electron density. The Raman backscatter is seen to decrease below detectable levels when the incident C${\mathrm{O}}_{2}$-laser intensity is attenuated approximately 50%, consistent with theoretical intensity thresholds of the Raman process.
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