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We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.
Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm–1.71 μm wavelengths. By driving plasma of reduced size (∼200μm) with 1.71μm laser, we could extend the cutoff to ∼70eV, while reducing the peak intensity by only ∼31%.
We perform spectroscopic characterization of graphite plasma to study the species responsible for high-order harmonics generation. We observed that visible region contains vibrational transitions of C2 and C3 molecules. Under the same conditions, we found shorter delays are favorable for intense HHG.
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