Spatiotemporal instabilities of terahertz OAM beams from air plasma via chirping a few-cycle vortex pump field

Wang, Honggeng; Xu, Shixiang; Chen, Yueyue; Shen, Baifei

doi:10.1007/s12596-021-00814-8

J Opt

2022

DOI: 10.1007/s12596-021-00814-8

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Spatiotemporal instabilities of terahertz OAM beams from air plasma via chirping a few-cycle vortex pump field

Honggeng Wang

Shixiang Xu

Yueyue Chen

et al.

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Cited by 2 publications

References 34 publications

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Generation and periodic evolution of third harmonics carrying transverse orbital angular momentum in air-plasma filaments

Wang,

Chen,

Zhang

et al. 2023

Opt. Express

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Spatiotemporal optical vortex (STOV) pulses, possessing inherent transverse orbital angular momentum (OAM) and exhibiting phase singularity and intensity null in the spatiotemporal (ST) domain, have received increasing attention in recent years. Here, we investigate theoretically the third harmonic generation and evolution properties of STOV pulses via the interaction of 800-nm-STOV pulses with air-plasma filaments. We show that beautiful third harmonic STOV pulses are generated at a propagation distance of several millimeters. During further propagation, the ST intensity profiles of the third harmonics undergo variations in a periodic way, leading to the distortion and subsequent restoration to the initial ring pattern. The periodic evolution is a result of the interference effects between the third harmonics generated with different phases. Consequently, the evolution period is roughly twice the dephasing length of the third harmonics. Meanwhile, additional singularities emerge in the intensity patterns due to destructive interference occurring at specific dephasing lengths for the specific frequency components. The high-frequency components experience destructive interference earlier than the low-frequency components during each evolution period because the dephasing length decreases with frequency. This results in the sequentially appearance of the additional singularities from top to bottom in the ST intensity patterns. The proposed scheme demonstrates a way for higher-order STOV generation and manipulation in air-plasma filaments, which can be of interest for experiments related to vortex light science.

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Generation and periodic evolution of third harmonics carrying transverse orbital angular momentum in air-plasma filaments

Wang,

Chen,

Zhang

et al. 2023

Opt. Express

View full text Add to dashboard Cite

show abstract

Design of broadband terahertz vector and vortex beams: I. Review of materials and components

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

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In this paper, we review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency range. The particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz pulses. We review the available materials and components, analyse proposed and potentially possible solutions for broadband terahertz vortex and vector beam shaping, compare all developed approaches, and put forward a unified concept for constructing passive shapers of such beams from the existing component base.

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Spatiotemporal instabilities of terahertz OAM beams from air plasma via chirping a few-cycle vortex pump field

Cited by 2 publications

References 34 publications

Generation and periodic evolution of third harmonics carrying transverse orbital angular momentum in air-plasma filaments

Generation and periodic evolution of third harmonics carrying transverse orbital angular momentum in air-plasma filaments

Design of broadband terahertz vector and vortex beams: I. Review of materials and components

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