Remote terahertz spectroscopy from extended two-color plasma filaments: The ALTESSE 2 project

Talbi, Abderazek; Zhou, Binbin; Jepsen, Peter Uhd; Skupin, Stefan; Courjaud, Antoine; Bergé, Luc

doi:10.1209/0295-5075/acdc4c

Cited by 3 publications

(1 citation statement)

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Section: £îëâðëç ôäñìôõä åâêñäñì ôóçAeþ ðâ òâóâïçõóþ õçóâåçóùçäñåñ ëê...unclassified

Generation of terahertz radiation in the plasma of optical gas breakdown

Ushakov,

Chizhov,

Bukin

et al. 2023

Usp. Fiz. Nauk

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The paper presents the current state of research on the generation of terahertz radiation in the optical breakdown of gases by laser radiation, consisting of the fundamental and second harmonics of femtosecond laser radiation. We consider the main approaches to describing the generation of terahertz radiation. The inêuence of the focusing mode, spatial and temporal modulation, changes in the wavelength, and polarization state of the pump radiation is shown. Also considered is the inêuence of the properties of the medium into which laser radiation is focused.

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Section: £îëâðëç ôäñìôõä åâêñäñì ôóçAeþ ðâ òâóâïçõóþ õçóâåçóùçäñåñ ëê...unclassified

Generation of terahertz radiation in the plasma of optical gas breakdown

Ushakov,

Chizhov,

Bukin

et al. 2023

Usp. Fiz. Nauk

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Waveshape of terahertz radiation produced by two-color laser-induced air plasmas

Stathopulos,

Skupin,

Zhou

et al. 2024

Phys. Rev. Research

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The spatial and spectral distributions of terahertz (THz) pulses emitted by two-color air plasmas are theoretically investigated for focused laser pulses and in the filamentation regime. We derive a so-called conical emission model, which, like the one proposed by You [], involves phase matching between laser harmonics along the plasma channel, the plasma density and length, and the emitted frequency as key parameters. Our augmented model, however, treats envelope effects and accounts for transverse variations of both plasma- and Kerr-driven potential THz emitters. We highlight the importance of the characteristic spatiospectral distributions of these two conversion mechanisms in the expression of the angular radiated power. The results of our model are successfully compared with data provided by a comprehensive, fully space- and time-resolved unidirectional solver. Importantly, these numerical simulations clear up the effective plasma length along which THz emission develops, compared with the dephasing length over which the laser fundamental and second harmonic shift out-of-phase. The impact of common optical aberrations, such as sphericity, astigmatism, and coma, on the THz generation is also investigated. Aberrations are shown to generally decrease the laser-to-THz conversion efficiency and potentially induce spatial asymmetries and narrowing of the THz spectra. Published by the American Physical Society 2024

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