Laser emission at 428 nm in N2+: Competition between two- and three-level amplification - Archive ouverte HAL
Article Dans Une Revue Applied Physics Letters Année : 2023

Laser emission at 428 nm in N2+: Competition between two- and three-level amplification

Résumé

Lasing of N2+ at 428 nm is studied as a function of the delay dt between two 800 nm ultrashort pumping pulses from a Ti:sapphire laser. This lasing corresponds to a population-inverted transition between levels B2Σ+u(0) and X2Σ+g(1) of a singly ionized nitrogen molecule. An important erasing of laser emission is observed under pumping with two consecutive pulses separated by large delays −20 ps < dt < +20 ps. From an analysis of the quenching results, we conclude that the mechanism of lasing corresponds to a coherent two-photon amplification scheme. Our results show that a two-photon process can dominate over a population-inverted one-photon amplification.
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Dates et versions

hal-04038170 , version 1 (20-03-2023)

Identifiants

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Rostyslav Danylo, Xiang Zhang, Anna Lisova, A. Houard, Yi Liu, et al.. Laser emission at 428 nm in N2+: Competition between two- and three-level amplification. Applied Physics Letters, 2023, 122 (11), pp.111109. ⟨10.1063/5.0132475⟩. ⟨hal-04038170⟩
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