Ultrafast Science, Volume. 2, Issue 1, 9870325(2022)

Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments

Zhelin Zhang1,2,3, Jiayang Zhang2,3, Yanping Chen2,3、*, Tianhao Xia2,3, Linzheng Wang2,3, Bonan Han2,3, Feng He2,3, Zhengming Sheng1,2,3,4, and Jie Zhang1,2,3
Author Affiliations
  • 1Tsung-Dao lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Key Laboratory for Laser Plasmas (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • 4Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, UK
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    Terahertz radiation with a Bessel beam profile is demonstrated experimentally from a two-color laser filament in air, which is induced by tailored femtosecond laser pulses with an axicon. The temporal and spatial distributions of Bessel rings of the terahertz radiation are retrieved after being collected in the far field. A theoretical model is proposed, which suggests that such Bessel terahertz pulses are produced due to the combined effects of the inhomogeneous superluminal filament structure and the phase change of the two-color laser components inside the plasma channel. These two effects lead to wavefront crossover and constructive/destructive interference of terahertz radiation from different plasma sources along the laser filament, respectively. Compared with other methods, our technique can support the generation of Bessel pulses with broad spectral bandwidth. Such Bessel pulses can propagate to the far field without significant spatial spreading, which shall provide new opportunities for terahertz applications.

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    Zhelin Zhang, Jiayang Zhang, Yanping Chen, Tianhao Xia, Linzheng Wang, Bonan Han, Feng He, Zhengming Sheng, Jie Zhang. Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments[J]. Ultrafast Science, 2022, 2(1): 9870325

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    Paper Information

    Category: Research Articles

    Received: Dec. 14, 2021

    Accepted: Feb. 4, 2022

    Published Online: Sep. 28, 2023

    The Author Email: Chen Yanping (yanping.chen@sjtu.edu.cn)

    DOI:10.34133/2022/9870325

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