Three-half harmonic generation in laser-plasma interaction: Evidence for plasmon propagation |
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| Authors: | D Giulietti V Biancalana D Batani A Giulietti L Gizzi L Nocera E Schifano |
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| Institution: | (1) Istituto di Fisica Atomica e Molecolare, via del Giardino, 7-56100 Pisa, Italia;(2) Present address: Dipartimento di Fisica, Università di Pisa, Italia;(3) Present address: ICF group, Dipartimento di Fisica, Università Statale di Milano, Italia;(4) Present address: Blackett Laboratory, Imperial College, London, UK;(5) Present address: Ecole Polytechnique, LULI, Palaiseau, France |
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| Abstract: | Summary Side emitted 3ω/2 radiation was studied by interacting 1.064 μm laser light with plasmas obtained from exploding thin foils.
Both focusing (f/8) and collecting (f/7) optics were designed in order to reduce the instrumental bandwidth of the 3ω/2 spectrum. Time-resolved spectra and time-resolved
images were obtained and analysed. All the observed spectral features, including the substantial lack of a ?blue? component,
the amount of red shift and bandwidth, are consistent with the Karttunen theory of half-integer harmonics generated in plasmas.
This theory takes into account the propagation of ω/2 plasmons produced by ?two plasmon decay? and their coupling with laser
light. |
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| Keywords: | Plasma production and heating by laser beams |
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