摘要
We propose a simple pump-coupling-seed scheme to examine the optical X^2Σg^+–A^2Πu coupling in N2^+ lasing. We produce the N2^+ lasing at 391 nm, corresponding to the B^2Σu^+(v = 0)–X^2Σg+(v = 0) transition, by externally seeding the N^2+ 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 X^2+Σg^–A^2Πu transition.
We propose a simple pump-coupling-seed scheme to examine the optical X2Σg+–A2Πu coupling in N2+ lasing. We produce the N2+ lasing at 391 nm, corresponding to the B2Σu+（v = 0）–X2Σg+（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 X2+Σg–A2Πu transition.
作者
Siqi Wang
Yao Fu
Danwen Yao
Shanming Chen
Wei Zhang
Helong Li
Huailiang Xu
王思琪;付尧;姚丹雯;陈善铭;张维;李贺龙;徐淮良(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China)
基金
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)
Fundamental Research Funds for the Central Universities of China
