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Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air
- Ultrafast Science Vol. 2, Issue 6, (2022)
- Affiliations：
a Institute of Modern Optics, Nankai University, Tianjin 300350, Chinab Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, Chinac Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, Chinad Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japane Peking University Yangtze Delta Institute of Optoelectronics, Nantong, 226010 Jiangsu, Chinaf Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu,China,30010
- Author bio：
- Funds：This study was supported by the National Key R&DProgram of China (2018YFB0504400), the National NaturalScience Foundation of China (12061131010 and 12074198),the Russian Science Foundation (21-49-00023), and theNatural Science Foundation of Tianjin Municipality(20JCYBJCO1040).
DOI：10.34133/2022/9853053
CLC：Published：2022，
- Accepted：
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Zhiqiang Yu, Lu Sun, Nan Zhang, Jianxin Wang, Pengfei Qi, Lanjun Guo, Quan Sun, Weiwei Liu, and Hiroaki Misawa. 2022: Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air. 超快科学, 2022(6).
Zhiqiang Yu, Lu Sun, Nan Zhang, Jianxin Wang, Pengfei Qi, Lanjun Guo, Quan Sun, Weiwei Liu, and Hiroaki Misawa. 2022: Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air. Ultrafast Science, 2022(6).
Zhiqiang Yu, Lu Sun, Nan Zhang, Jianxin Wang, Pengfei Qi, Lanjun Guo, Quan Sun, Weiwei Liu, and Hiroaki Misawa. 2022: Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air. 超快科学, 2022(6). DOI： 10.34133/2022/9853053
Zhiqiang Yu, Lu Sun, Nan Zhang, Jianxin Wang, Pengfei Qi, Lanjun Guo, Quan Sun, Weiwei Liu, and Hiroaki Misawa. 2022: Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air. Ultrafast Science, 2022(6). DOI： 10.34133/2022/9853053
摘要
The THz generation efficiency and the plasma density generated by a filament in air have been found anti-correlated when pumped by 800 nm+1600 nm two-color laser field. The plasma density near zero delay of two laser pulses has a minimum value
which is opposite to the trend of THz generation efficiency and contradicts common sense. The lower plasma density cannot be explained by the static tunneling model according to the conventional photocurrent model
but it might be attributed to the electron trapping by the excited states of nitrogen molecule. The present work also clarifies the dominant role of the drifting velocity accelerated by the two-color laser field during the THz pulse generation process. The results promote our understanding on the optimization of the THz generation efficiency by the two-color laser filamentation.
Abstract
The THz generation efficiency and the plasma density generated by a filament in air have been found anti-correlated when pumped by 800 nm+1600 nm two-color laser field. The plasma density near zero delay of two laser pulses has a minimum value
which is opposite to the trend of THz generation efficiency and contradicts common sense. The lower plasma density cannot be explained by the static tunneling model according to the conventional photocurrent model
but it might be attributed to the electron trapping by the excited states of nitrogen molecule. The present work also clarifies the dominant role of the drifting velocity accelerated by the two-color laser field during the THz pulse generation process. The results promote our understanding on the optimization of the THz generation efficiency by the two-color laser filamentation.
关键词
Terahertzfilamentplasma densityelectron trapping
Keywords
Terahertzfilamentplasma densityelectron trapping
references
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