Fullerenes: The attractive medium for harmonic generation

We review the results of systematic experimental studies of high-order harmonic generation (HHG) in C₆₀-rich laser-produced plasma under different plasma conditions and laser parameters. The morphology of fullerene clusters before and after ablation is analyzed to define the optimal conditions of excitation of C₆₀-containing targets. The enhancement of HHG efficiency in C₆₀-rich plasmas by using the two-color pump technique is discussed. The conversion efficiency for the odd and even harmonics in the vicinity of surface plasmon resonance of the C₆₀-containing plasma (40–70 nm) was estimated to be in the range of 10⁻⁴.