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Recorded third harmonic spectra across the pump-probe time zero in (a) argon and (b) , both at 600 Torr.
Photodiode signal measuring relative THG average power in Ar (red), (black), (blue, dot dash), and (red, dashed) with a focal length of 30 cm and probe and pump pulse energies of 140 and , respectively. The relative THG over a range of pressure is shown both (a) without and (b) with the pump pulse.
(a) THG conversion enhancement for Ne (blue), Ar (red), (black), (blue, dot dash), and (red, dashed) with 30 cm focal mirror and probe and pump pulse energies of 140 and , respectively. (b) Maximum enhancement observed for argon with a focal length of 50 cm and the pulse energies given for (a).
Gases used in the experiment with their respective ionization potential in eV. The enhancement quoted is the peak enhancement found in the pressure scans with 30 and 50 cm focal length mirrors and 140 mW probe power.
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