Bessel terahertz pulses from superluminal laser plasma filaments

Zhang, Zhelin and Zhang, Jiayang and Chen, Yanping and Xia, Tianhao and Wang, Linzheng and Han, Bonan and He, Feng and Sheng, Zhengming and Zhang, Jie (2022) Bessel terahertz pulses from superluminal laser plasma filaments. Ultrafast Science, 2022. 9870325. ISSN 2765-8791 (https://doi.org/10.34133/2022/9870325)

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Abstract

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.

  • Item type:Article
    ID code:83971
    Dates:
    Date
    Event
    2 March 2022
    Published
    4 February 2022
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:02 Feb 2023 09:15
    Last modified:25 Apr 2024 01:31
    URI:https://strathprints.strath.ac.uk/id/eprint/83971
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