Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation

doi:10.1088/1674-1056/27/5/054101

Abstract Femtosecond laser filamentation is a method of generating terahertz, which has wide application in terahertz sub-wavelength resolution imaging. In this paper, the plasma filament formed by femtosecond laser focusing was terminated with an alumina ceramics at different positions and the influence of the cutting off position of the plasma filament on the terahertz wave was studied. The results showed that the terahertz amplitude increases as the position approaches the end of the filament gradually. The stability of amplitude and peak frequency of the terahertz generated by the filament formed by two-color femtosecond laser via a lens with a longer focal length is lower than that through a lens with a shorter focal length, especially the terahertz amplitude at the end of the filament. The study will be helpful for future researchers in the field of THz sub-wavelength imaging utilizing femtosecond laser filament.

Keywords: terahertz laser filament

Received: 20 December 2017
Revised: 27 January 2018
Accepted manuscript online:

PACS:	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	52.38.Hb	(Self-focussing, channeling, and filamentation in plasmas)

Fund: Project supported by the National Defense Basic Scientific Research Program of China (Grant No.Z202013T001) and Postgraduate Innovation Fund Project by Southwest University of Science and Technology,China (Grant No.16ycx104).

Corresponding Authors: Li-Ping Shang
E-mail: shangliping@swust.edu.cn

Cite this article:

Zhan-Qiang Xue(薛占强), Li-Ping Shang(尚丽平), Hu Deng(邓琥), Qian-Cheng Zhang(张前成), Quan-Cheng Liu(刘泉澄), Wei-Wei Qu(屈薇薇), Zhan-Feng Li(李占锋), Shun-Li Wang(王顺利) Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation 2018 Chin. Phys. B 27 054101

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Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation

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