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We report on the investigation on harmonic-seeded remote laser emissions at391 nm wavelength from strong-field ionized nitrogen molecules in threedifferent gas mixtures, i.e., N2-Ar, N2-Xe and N2-Ne. We observed a decrease inthe remote laser intensity in the N2-Xe mixture because of the decreasedclamped intensity in the filament; whereas in the N2-Ne mixture, the remotelaser intensity slightly increases because of the increased clamped intensitywithin the filament. Remarkably, although the clamped intensity in the filamentremains nearly unchanged in the N2-Ar mixture because of the similar ionizationpotentials of N2 and Ar, a significant enhancement of the lasing emission isrealized in the N2-Ar mixture. The enhancement is attributed to the strongerthird harmonic seed, and longer gain medium due to the extended filament.

Harmonic-seeded remote laser emissions in N2-Ar, N2-Xe and N2-Ne mixtures: a comparative study