Article Dans Une Revue Journal of the European Optical Society : Rapid publications Année : 2024

Frequency-resolved measurement of two-color air plasma terahertz emission

Eiji Hase
Takeshi Yasui

Résumé

We investigated the far-field terahertz beam profile generated from an air plasma induced by two-color femtosecond laser pulses. Under our experimental conditions (filament length shorter than the dephasing length between the two-color pulses), using electro-optic sampling in both ZnTe (0.2–2.2 THz) and GaP (0.4–6.8 THz) crystals, and ultra-broadband ABCD technique (1–17.5 THz), we determined that the THz beam exhibits a unimodal beam pattern below 4 THz and a conical one above 6 THz. This experimental finding is consistent with theoretical studies based on the unidirectional pulse propagation equation, which predict the transition of THz emission from a flat-top profile to a conical one due to the destructive interference of THz waves emitted from the plasma filament. Our results also underscore the importance of accounting for experimental artifacts, such as photo-excited losses in silicon resulting in on-axis THz absorption along with the influence of drilled mirrors, in characterizing the complex spatial and frequency-dependent behavior of two-color plasma-induced terahertz emission.

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Dates et versions

hal-04807606 , version 1 (27-11-2024)

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Eiji Hase, Jérôme Degert, Eric Freysz, Takeshi Yasui, Emmanuel Abraham. Frequency-resolved measurement of two-color air plasma terahertz emission. Journal of the European Optical Society : Rapid publications, 2024, 20 (2), pp.39. ⟨10.1051/jeos/2024042⟩. ⟨hal-04807606⟩
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