Lasing without population inversion in N2+ | Zendy

A. Mysyrowicz | Zendy; Rostyslav Danylo | Zendy; Aurélien Houard | Zendy; V. T. Tikhonchuk | Zendy; X. Zhang | Zendy; Zhiyuan Fan | Zendy; Qingqing Liang | Zendy; Sixuan Zhuang | Zendy; Luqi Yuan | Zendy; Y. Liu | Zendy

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Lasing without population inversion in N2+

Author(s) -

A. Mysyrowicz,

Rostyslav Danylo,

Aurélien Houard,

V. T. Tikhonchuk,

X. Zhang,

Zhiyuan Fan,

Qingqing Liang,

Sixuan Zhuang,

Luqi Yuan,

Y. Liu

Publication year - 2019

Publication title -

apl photonics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.094

H-Index - 34

ISSN - 2378-0967

DOI - 10.1063/1.5116898

Subject(s) - population inversion , lasing threshold , excited state , laser , physics , population , plasma , atomic physics , ground state , coupling (piping) , inversion (geology) , optics , materials science , quantum mechanics , paleontology , demography , structural basin , sociology , metallurgy , biology

We experimentally demonstrate the existence of long-lived coherent polarizations coupling simultaneously ground state X (X2Σg+) to excited states A (A2Πu) and B (B2Σu+) of N2+ 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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