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
Citation:
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
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
Citation:
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
a Institute of Modern Optics, Nankai University, Tianjin 300350, China
b Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, China
c Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, China
d Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan
e Peking University Yangtze Delta Institute of Optoelectronics, Nantong, 226010 Jiangsu, China
f Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, China
Funds:
This study was supported by the National Key R&D
Program of China (2018YFB0504400), the National Natural
Science Foundation of China (12061131010 and 12074198),
the Russian Science Foundation (21-49-00023), and the
Natural Science Foundation of Tianjin Municipality
(20JCYBJCO1040).
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.
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