Propagation of terahertz wave inside femtosecond laser filament in air

被引：47
|
作者：
Zhao, Jiayu [1 ]
Zhang, Yizhu [2 ]
Wang, Zhi [1 ]
Chu, Wei [3 ]
Zeng, Bin [3 ]
Liu, Weiwei [1 ]
Cheng, Ya [3 ]
Xu, Zhizhan [3 ]
机构：
[1] Nankai Univ, Key Lab Opt Informat Sci & Technol, Inst Modern Opt, Minist Educ, Tianjin 300071, Peoples R China
[2] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China
来源：
LASER PHYSICS LETTERS | 2014年 / 11卷 / 09期
基金：
中国国家自然科学基金;
关键词：
propagation; terahertz wave; femtosecond laser; plasma filament; refractive index; phase shift; INTENSITY; SPECTROSCOPY; EMISSION; PHASE;
D O I：
10.1088/1612-2011/11/9/095302
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Terahertz (THz) generation in femtosecond laser filament has recently been found to greatly expand THz applications in atmospheric remote sensing. In this article, by investigating the THz waveform emitted from different length of filaments, the refractive index of the THz wave has been found to be smaller than the unity within the filament region. It indicates that the THz pulse may propagate inside the filament though the diameter of the filament is much smaller than the wavelength of the THz wave. The hypothesis is supported by further numerical simulation, which considers the radially non-uniform plasma density distribution of the filament.
引用
收藏
页数：6
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