中国物理B ›› 2019, Vol. 28 ›› Issue (12): 123301-123301.doi: 10.1088/1674-1056/ab54b1

所属专题： SPECIAL TOPIC — Strong-field atomic and molecular physics

• SPECIAL TOPIC—Strong-field atomic and molecular physics • 上一篇    下一篇

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

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)   

  1. 1 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;
    2 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    3 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • 收稿日期:2019-08-26 修回日期:2019-10-12 出版日期:2019-12-05 发布日期:2019-12-05
  • 通讯作者: Helong Li, Huailiang Xu E-mail:helongli@jlu.edu.cn;huailiang@jlu.edu.cn
  • 基金资助:
    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.

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

Siqi Wang(王思琪)1, Yao Fu(付尧)1, Danwen Yao(姚丹雯)1, Shanming Chen(陈善铭)1, Wei Zhang(张维)1, Helong Li(李贺龙)1,2, Huailiang Xu(徐淮良)1,3   

  1. 1 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;
    2 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    3 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • Received:2019-08-26 Revised:2019-10-12 Online:2019-12-05 Published:2019-12-05
  • Contact: Helong Li, Huailiang Xu E-mail:helongli@jlu.edu.cn;huailiang@jlu.edu.cn
  • Supported by:
    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.

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摘要： 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 X2Σg+-A2Πu transition.

关键词: air lasing, intense laser fields, nitrogen molecules

Abstract: 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 X2Σg+-A2Πu transition.

Key words: air lasing, intense laser fields, nitrogen molecules

中图分类号:  (Spectra induced by strong-field or attosecond laser irradiation)

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