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Lasing without population inversion in N2+

Abstract : We experimentally demonstrate the existence of long-lived coherent polarizations coupling simultaneously ground state X (X 2 Σ + g) to excited states A (A 2 Πu) and B (B 2 Σ + u) of N + 2 inside a plasma created by a short intense laser pulse at 800 nm. This three-level V-scheme arrangement is responsible for a strong optical gain without population inversion at the B-X transition at 391.4 nm. Simulations based on Maxwell-Bloch equations reproduce well the kinetics and the pressure dependence of the gain.
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Submitted on : Friday, November 15, 2019 - 12:12:15 PM
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A. Mysyrowicz, Rostyslav Danylo, Aurélien Houard, V. Tikhonchuk, X. Zhang, et al.. Lasing without population inversion in N2+. APL Photonics, AIP Publishing LLC, 2019, 4, pp.110807. ⟨10.1063/1.5116898⟩. ⟨hal-02365149⟩

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