Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers

doi:10.1088/1674-1056/24/8/088703

Abstract Generation of intense broadband terahertz (THz) waves from gas plasma induced by tri-color ultrashort (fundamental (ω), second harmonic (2ω), and third harmonic (3ω)) laser pulses is theoretically investigated. Simulation results show that the 3ω laser pulse can greatly enhance or suppress the generation of THz wave at different values of relative phase (θ₃) between the 3ω and ω fields. Moreover, the polarities of the generated THz waves can be controlled by changing θ₃, with the relative phase θ₂ (between the 2ω and ω fields) fixed to be a certain value. All of our results show that θ₃ plays a key role in the generation process, which promises to control the intensity as well as the polarity of gas plasma-induced THz radiation.

Keywords: terahertz ultrashort laser photocurrent model plasma

Received: 08 November 2014
Revised: 15 January 2015
Accepted manuscript online:

PACS:	87.50.U-
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	78.20.Bh	(Theory, models, and numerical simulation)
	41.75.Jv	(Laser-driven acceleration?)

Fund: Project supported by the Wuhan Applied Basic Research Project, China (Grant No. 20140101010009), the National Natural Science Foundation of China (Grant Nos. 61177095, 61475054, and 61405063), the Natural Science Foundation of Hubei Province, China (Grant Nos. 2012FFA074 and 2013BAA002), the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2013KXYQ004, 2014ZZGH021, and 2014QN023), and the Technology Innovation Foundation from Innovation Institute of Huazhong University of Science and Technology, China (Grant No. CXY13Q015).

Corresponding Authors: Wang Ke-Jia
E-mail: wkjtode@sina.com

Cite this article:

Wang Cheng-Liang (王成亮), Yang Zhen-Gang (杨振刚), Liu Jin-Song (刘劲松), Wang Sheng-Lie (汪盛烈), Wang Ke-Jia (王可嘉) Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers 2015 Chin. Phys. B 24 088703

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Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers

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