title: Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study.
abstract: We report on the investigation on harmonic-seeded remote laser emissions at 391 nm wavelength from strong-field ionized nitrogen molecules in three different gas mixtures, i.e., N₂-Ar, N₂-Xe and N₂-Ne. We observed a decrease in the remote laser intensity in the N₂-Xe mixture because of the decreased clamped intensity in the filament; whereas in the N₂-Ne mixture, the remote laser intensity slightly increases because of the increased clamped intensity within the filament. Remarkably, although the clamped intensity in the filament remains nearly unchanged in the N₂-Ar mixture because of the similar ionization potentials of N₂ and Ar, a significant enhancement of the lasing emission is realized in the N₂-Ar mixture. The enhancement is attributed to the stronger third harmonic seed, and longer gain medium due to the extended filament.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China.
authors.forename: Jielei
authors.initials: J
authors.lastname: Ni
authors.forename: Wei
authors.initials: W
authors.lastname: Chu
authors.forename: Haisu
authors.initials: H
authors.lastname: Zhang
authors.forename: Chenrui
authors.initials: C
authors.lastname: Jing
authors.forename: Jinping
authors.initials: J
authors.lastname: Yao
authors.forename: Huailiang
authors.initials: H
authors.lastname: Xu
authors.forename: Bin
authors.initials: B
authors.lastname: Zeng
authors.forename: Guihua
authors.initials: G
authors.lastname: Li
authors.forename: Chaojin
authors.initials: C
authors.lastname: Zhang
authors.forename: See Leang
authors.initials: SL
authors.lastname: Chin
authors.forename: Ya
authors.initials: Y
authors.lastname: Cheng
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu