Experiments examining nonlinear scattering mechanisms of high intensity (2 ×{} 10¹⁸ W/cm²) laser light in underdense plasmas were performed. Redshifted second harmonic emission at 45^∘{} from the directly backscatterd direction was observed from field ionized plasmas having electron densities ranging up to 10¹⁹ cm^-3. This result is consistent with the doubling of stimulated Raman scattered light from large plasma electron density gradients produced by ponderomotive cavitation.
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Krushelnick et al. (1995) studied this question.
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