Abstract
We analyze fullerenes as the medium for harmonic generation of ultrashort laser pulses. The harmonic yield from fullerene-rich plasma was about 25 times larger compared with those produced from a bulk carbon target. Enhancement of harmonic yield is observed near 20 eV, which is attributed to the influence of a broadband plasmon resonance of C60 on the nonlinear optical response of fullerene-rich plasma. The influence of phase modulation of the fundamental radiation in fullerene plasmas on the spectral properties of harmonics has been analyzed. We also discuss the results of experimental and theoretical studies of high-order harmonic generation (HHG) in plasmas containing fullerenes using pulses of different duration and wavelength. Finally, we analyze the HHG in ordinary buckyball C60, endohedral In@C60 fullerene, and endohedral Sb@C60 fullerene by means of time-dependent density functional theory.
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