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

doi:10.1088/1674-1056/25/4/044209

中国物理B ›› 2016, Vol. 25 ›› Issue (4): 44209-044209.doi: 10.1088/1674-1056/25/4/044209

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

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)

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

收稿日期:2015-10-20 修回日期:2015-11-27 出版日期:2016-04-05 发布日期:2016-04-05
通讯作者: He-Ping Zeng E-mail:hpzeng@phy.ecnu.edu.cn
基金资助:
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).

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

Received:2015-10-20 Revised:2015-11-27 Online:2016-04-05 Published:2016-04-05
Contact: He-Ping Zeng E-mail:hpzeng@phy.ecnu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: terahertz generation, laser filament

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.

Key words: terahertz generation, laser filament

中图分类号: (Nonlinear optics)

42.65.-k

52.38.-r (Laser-plasma interactions) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)

李敏, 李安原, 何泊衢, 袁帅, 曾和平. Modulation of terahertz generation in dual-color filaments by an external electric field and preformed plasma[J]. 中国物理B, 2016, 25(4): 44209-044209.

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[J]. Chin. Phys. B, 2016, 25(4): 44209-044209.

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

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

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