Abstract
After a brief review of stimulated Raman scattering and two-plasmon decay, which dominate the physics of laser–plasma interactions at and below the quarter-critical density, we summarize some of the principal characteristics of emission from targets at half-harmonics of the laser frequency. Two mechanisms in particular are thought to contribute to the emission; Raman conversion and the direct linear conversion of plasmons generated by two-plasmon decay. Both processes are reviewed and the implications of each for the emission spectra examined.The effect of strong self-generated magnetic fields on harmonic generation is considered briefly and attention is drawn to ways in which the coincidence of interactions in the underdense plasma may influence their basic characteristics. A finite-amplitude ion wave, for example, modifies the spectrum of Raman scattered light, including significant frequency splitting.
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