We present the simultaneous study of laser-induced plasma emission spectroscopy and high-order harmonic generation (HHG) from laser-ablated graphite plume. Time resolved evolution of carbon species in the ablation plume is investigated, revealing a clear abundance of C 2 molecules under conditions optimal for graphite HHG. We also compare the high-order harmonic spectra with the photoionization cross-section of C 2 molecules, which shows good agreement between the two. Our observations provide strong evidence that C 2 molecules contribute to intense graphite HHG. Furthermore, properties of C 2 molecules are investigated at different time periods of plasma evolution, and we identify the laser-ablation conditions for optimum harmonics yield.
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Fareed et al. (2016) studied this question.
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