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(a) The experimental setup, and the digital camera captured images of (b) the side view of the filament in air, and (c) the far-field spatial pattern of the third harmonic. The inset in (a) shows the single-shot autocorrelation (SSA) signal of the IR pulse at .
Normalized far-field spectra (in log scale and normalized by maximum intensity of TH) of output TH pulse at the pump pulse energies of (a) , (b) , (c) , and (d) . The signal indicated by the dashed ring is the remaining SH of the pump wave from the OPA.
Comparison of the spectra (in log scale and normalized by maximum intensity of TH) between the on-axis TH emission and the conical TH emission at the pump pulse energy of . The reference spectrum is the cubic intensity of the input FW spectra with a threefold decrease in wavelength.
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