Resent research on high-order harmonic generation in laser-produced
plasmas is reviewed. We analyze the conditions for the generation of
harmonics (up to the 101st order, . ~ 7.9 nm) in the propagation of
laser radiation through a weakly-ionized plasma prepared by irradiating
the surfaces of different targets with a laser prepulse. First
experiments on attosecond pulse generation from plasma plumes are
presented. We discuss the findings of investigations into the resonance
intensity enhancement of individual harmonics in a number of plasma
formations, which have demonstrated a substantial increase in the
conversion efficiency in the plateau region of the harmonic distribution
(in particular, of the 13th harmonic in indium plasmas with the
efficiency 10-4). We review the results of investigations of harmonic
generation in nanoparticle-containing plasmas (metallic clusters,
fullerenes, nanotubes). Different techniques for increasing the
intensity and order of the generated harmonics are discussed. Future
perspectives are analyzed as well. Among them are: (a) high-power
harmonics from nanoclusters at 1 kHz pulse repetition rates, (b)
few-cycle pump-induced harmonics, (c) molecular orientation in plasma
plumes, (d) attosecond experiments, (e) plasma manipulations, (e)
carbon-containing plasma: perspectives of application for plasma HHG,
(f) long-wavelength femtosecond pump.
PPT slides and other material here
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