| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Dramatic Spectral Broadening of Ultrafast Laser Pulses in Molecular Nitrogen Ions |
| Jin-Ming Chen1,3,4, Jin-Ping Yao1**, Zhao-Xiang Liu1,3, Bo Xu1,3, Fang-Bo Zhang1,3, Yue-Xin Wan1,3, Wei Chu1, Zhen-Hua Wang2, Ling-Ling Qiao1, Ya Cheng1,2,5** |
1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062
3University of Chinese Academy of Sciences, Beijing 100049
4School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031
5Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006
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| Cite this article: |
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Jin-Ming Chen, Jin-Ping Yao, Zhao-Xiang Liu et al 2019 Chin. Phys. Lett. 36 104204 |
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Abstract We investigate nonlinear interaction of nitrogen molecules with a two-color laser field composed by an intense 800 nm laser pulse and a weak 400 nm laser pulse. It is demonstrated that the spectrum of 400 nm pulses is dramatically broadened when the two beams temporally overlap. In comparison, the spectral broadening in argon is less pronounced, although argon atoms and nitrogen molecules have comparable ionization potentials. We reveal that the dramatic spectral broadening originates from the greatly enhanced nonlinear optical effects in the near-resonant condition of interaction between the 400 nm pulses and the nitrogen molecular ions.
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Received: 12 August 2019
Published: 21 September 2019
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| PACS: |
42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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| Fund: Supported by the National Key Research and Development Program of China under Grant No 2018YFB0504400, the National Natural Science Foundation of China under Grant Nos 11822410, 11734009 and 61575211, the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No XDB16030300, the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant No QYZDJ-SSW-SLH010, the Key Project of the Shanghai Science and Technology Committee under Grant No 18DZ1112700, the Shanghai Rising-Star Program under Grant No 17QA1404600, and the Youth Innovation Promotion Association of the Chinese Academy of Sciences under Grant No 2018284. |
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