Abstract
Thin plastic foils have been irradiated at 1.064 μm laser wavelength and an intensity up to 5x 1013 W/cm2. The plasma produced became underdense during the laser pulse and electron temperatures of several hundred eV’s were obtained. Second harmonic and three-halves harmonic emission have been studied perpendicularly to the laser beam axis. Time resolved imaging and spectroscopy gave us novel information on the physical mechanisms involved in these processes. The 2ω line was found to be red shifted consistently with the frequency sum between the incident laser light and the Brillouin backscattered radiation. Such an effect was already postulated to explain second harmonic side emission from filaments occurring in an underdense corona. However the occurrence of frequency sum in a plasma was demonstrated for the first time in our experiment. 3ω/2 spectra showed an intense broadband red-shifted component and a very faint blue component. The analysis of spectral features of 3ω/2 light, in terms of coupling between laser light and electron waves generated by Two Plasmon Decay (TPD) of the laser light itself, allowed us to conclude that the TPD plasmons propagate through the nc/4 layer before they couple.
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Giulietti, A. et al. (1991). Analysis of 2ω and 3ω/2 Spectra from Plasmas Produced by Irradiation of Thin Foil Targets. In: Hora, H., Miley, G.H. (eds) Laser Interaction and Related Plasma Phenomena. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3804-2_19
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DOI: https://doi.org/10.1007/978-1-4615-3804-2_19
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