Observation of the optical X2Σg+-A2Πu coupling in N2+ lasing induced by intense laser field

doi:10.1088/1674-1056/ab54b1

Abstract We propose a simple pump-coupling-seed scheme to examine the optical X²Σ_g⁺-A²Π_u coupling in N₂⁺ lasing. We produce the N₂⁺ lasing at 391 nm, corresponding to the B²Σ_u⁺(v'=0)-X²Σ_g⁺(v=0) transition, by externally seeding the N₂⁺ gain medium prepared by irradiation of N₂ with an intense pump pulse. We then adopt a weak coupling pulse in between the pump and seed pulses, and show that the intensity of the 391-nm lasing can be efficiently modulated by varying the polarization direction of the coupling pulse with respect to that of the pump pulse. It is found that when the polarization directions of the pump and coupling pulses are perpendicular, the 391-nm lasing intensity is more sensitive to the coupling laser energy, which reflects the inherent nature of the perpendicular X²Σ_g⁺-A²Π_u transition.

Keywords: air lasing intense laser fields nitrogen molecules

Received: 26 August 2019
Revised: 12 October 2019
Accepted manuscript online:

PACS:

33.20.Xx

(Spectra induced by strong-field or attosecond laser irradiation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61625501, 11904121, and 61427816), the Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM), China, the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT), China (Grant No. 2017TD-21), and Fundamental Research Funds for the Central Universities of China.

Corresponding Authors: Helong Li, Huailiang Xu
E-mail: helongli@jlu.edu.cn;huailiang@jlu.edu.cn

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Siqi Wang(王思琪), Yao Fu(付尧), Danwen Yao(姚丹雯), Shanming Chen(陈善铭), Wei Zhang(张维), Helong Li(李贺龙), Huailiang Xu(徐淮良) Observation of the optical X²Σ_g⁺-A²Π_u coupling in N₂⁺ lasing induced by intense laser field 2019 Chin. Phys. B 28 123301

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[1]	Air lasing: Phenomena and mechanisms Helong Li(李贺龙), Danwen Yao(姚丹雯), Siqi Wang(王思琪), Yao Fu(付尧), Huailiang Xu(徐淮良). Chin. Phys. B, 2019, 28(11): 114204.

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Observation of the optical X2Σg+-A2Πu coupling in N2+ lasing induced by intense laser field

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Observation of the optical X²Σ_g⁺-A²Π_u coupling in N₂⁺ lasing induced by intense laser field