Plasma line emission is observed in simulations of dense plasma irradiated by moderately intense light pulses of duration some tens of femtoseconds, and its scaling with density and with laser intensity is studied. Plasma emission is recorded both during the pulse where it is observed against the background spectrum of harmonics of the laser frequency as well as postpulse. Harmonics of the plasma line up to the fifth have been observed. An unexpected feature present in most of the reflected light spectra appears on the blue side of the plasma line with a central frequency omega approximately 1.5omega(p).

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The nonlinear interaction of three and four waves in a warm magnetized plasma is studied using the Lagrangian formalism. General expressions for the coupling coefficients are obtained in each case. Coupled-mode equations describing four-wave interactions have been derived and solved. The extension of the theory to the interaction of random phase waves and weak inhomogeneity is also discussed.