Why do terahertz waves generated from long two-color filament always peak at around 1THz?

Xiaomin Qu; Xing Xu; Jing Lou; Mingxin Gao; Yifei Feng; Ziyi Zhang; Yindong Huang

doi:10.1117/12.2685581

26 November 2023 Why do terahertz waves generated from long two-color filament always peak at around 1THz?

Xiaomin Qu, Xing Xu, Jing Lou, Mingxin Gao, Yifei Feng, Ziyi Zhang, Yindong Huang

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 1277603 (2023) https://doi.org/10.1117/12.2685581
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Two-color laser induced filament can emit coherent broadband terahertz (THz) radiation. Surprisingly, when using a relative long focal length of lens to generate a long plasma filament, the THz wave frequency of the radiation will peak at around 1 THz. This can be found in the measurements by using different methods, such as the electro-optic sampling, fluorescence, air-biased coherent detection and interferometer method, however this phenomenon and its underlying reason have never been discussed before. In this paper, the observed THz peak frequency from the long filament can be interpreted by the phase match between the femtosecond laser and the generated THz emissions. These findings gain more insights into the generation mechanism of THz wave, and can help to boost the THz emission yield and tune the central frequency of THz emissions by manipulating the plasma.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaomin Qu, Xing Xu, Jing Lou, Mingxin Gao, Yifei Feng, Ziyi Zhang, and Yindong Huang "Why do terahertz waves generated from long two-color filament always peak at around 1THz?", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 1277603 (26 November 2023); https://doi.org/10.1117/12.2685581

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