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

被引：0
|
作者：
Xue, Zhan-Qiang [1 ]
Shang, Li-Ping [1 ,2 ]
Deng, Hu [1 ]
Zhang, Qian-Cheng [1 ]
Liu, Quan-Cheng [1 ]
Qu, Wei-Wei [1 ]
Li, Zhan-Feng [3 ]
Wang, Shun-Li [1 ]
机构：
[1] Southwest Univ Sci & Technol, Coll Informat Engineer, Mianyang 621010, Peoples R China
[2] Robot Technol Used Special Environm Key Lab Sichu, Mianyang 621010, Peoples R China
[3] Southwest Univ Sci & Technol, Coll Mfg Sci & Engn, Mianyang 621010, Peoples R China
来源：
CHINESE PHYSICS B | 2018年 / 27卷 / 05期
关键词：
terahertz; laser filament; SUPERCONTINUUM GENERATION; CONICAL EMISSION;
D O I：
10.1088/1674-1056/27/5/054101
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Femtosecond laser filamentation is a method of generating terahertz, which has wide application in terahertz subwavelength 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.
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页数：4
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