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Chin. Phys. B, 2016, Vol. 25(4): 044209    DOI: 10.1088/1674-1056/25/4/044209

Modulation of terahertz generation in dual-color filaments by an external electric field and preformed plasma

Min Li(李敏)1, An-Yuan Li(李安原)1, Bo-Qu He(何泊衢)2, Shuai Yuan(袁帅)1, He-Ping Zeng(曾和平)1,2
1 Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Abstract  Terahertz generation driven by dual-color filaments in air is demonstrated to be remarkably enhanced by applying an external electric field to the filaments. As terahertz generation is sensitive to the dual-color phase difference, a preformed plasma is verified efficiently in modulating terahertz radiation from linear to elliptical polarization. In the presence of preformed plasma, a dual-color filament generates terahertz pulses of elliptical polarization and the corresponding ellipse rotates regularly with the change of the preformed plasma density. The observed terahertz modulation with the external electric field and the preformed plasma provides a simple way to estimate the plasma density and evaluate the photocurrent dynamics of the dual-color filaments. It provides further experimental evidence of the photo-current model in governing the dual-color filament driven terahertz generation processes.
Keywords:  terahertz generation      laser filament  
Received:  20 October 2015      Revised:  27 November 2015      Accepted manuscript online: 
PACS:  42.65.-k (Nonlinear optics)  
  52.38.-r (Laser-plasma interactions)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
Fund: Project supported by the National Key Scientific Instrument Project, China (Grant No. 2012YQ150092), the National Basic Research Program of China (Grant No. 2011CB808105), the National Natural Science Foundation of China (Grant No. 11434005), the China Postdoctoral Science Foundation (Grant No. 2014M560348), and the Fund from the Shanghai Municipal Science and Technology Commission, China (Grant No. 14JC1401600).
Corresponding Authors:  He-Ping Zeng     E-mail:

Cite this article: 

Min Li(李敏), An-Yuan Li(李安原), Bo-Qu He(何泊衢), Shuai Yuan(袁帅), He-Ping Zeng(曾和平) Modulation of terahertz generation in dual-color filaments by an external electric field and preformed plasma 2016 Chin. Phys. B 25 044209

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