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Paper detail

Terahertz Wave Guiding by Femtosecond Laser Filament in Air

Femtosecond laser filament generates strong terahertz (THz) pulse in air. In this paper, THz pulse waveform generated by femtosecond laser filament has been experimentally investigated as a function of the length of the filament. Superluminal propagation of THz pulse has been uncovered, indicating that the filament creates a THz waveguide in air. Numerical simulation has confirmed that the waveguide is formed because of the radially non-uniform refractive index distribution inside the filament. The underlying physical mechanisms and the control techniques of this type THz pulse generation method might be revisited based on our findings. It might also potentially open a new approach for long-distance propagation of THz wave in air.

preprint2013arXivOpen access
Jiayu ZhaoYizhu ZhangZhi WangWei ChuBin ZengYa ChengZhizhan XuWeiwei Liu
physics.optics
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Jiayu ZhaoYizhu ZhangZhi WangWei ChuBin ZengYa ChengZhizhan XuWeiwei Liu

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