Abstract

ONDARZA, R.. Third harmonic conversion efficiency from laser-dense plasma interactions. Rev. mex. fis. [online]. 2005, vol.51, n.4, pp.415-419. ISSN 0035-001X.

A perturbative nonlinear procedure is used to account for the conversion efficiency of the third harmonic reflected from a dense plasma illuminated by a short laser pulse. It is found that the power ratio of the third harmonic to that of the fundamental is given by P₃/P₀ ~ α⁴₀ (ω₀/ω_p)², where a₀ is the amplitude of the incident wave, and ω₀and ω_p are the optical and plasma frequency, respectively. This power ratio was found to be in agreement with particle-in-cell (PIC) simulations. Furthermore, the model presented here predicts a resonant enhancement around a density four times critical. This effect is captured as well by numerical simulations, and proved to be a distinctive feature in the radiation spectra.

Keywords : Laser-plasma interaction; high harmonic generation.

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