Frequency-resolved characterization of broadband two-color air-plasma terahertz beam profiles

Mattias Rasmussen, Olivér Nagy, Stefan Skupin, Alexandre Stathopulos , Luc Berge, Peter Uhd Jepsen, Binbin Zhou

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The frequency-resolved terahertz (THz) beam profile characteristics of a two-color air-plasma THz source were investigated in the broadband frequency range (1-15 THz). The
frequency resolution is achieved by combining THz waveform measurements and the knife-edge technique. Our results show that the THz focal spot size is strongly frequency dependent. This has important implications on nonlinear THz spectroscopy applications where accurate knowledge of the applied THz electrical field strength onto the sample is important. In addition, the transition between the solid and hollow beam profile of the air-plasma THz beam was carefully identified. Far from the focus, the features across the 1-15 THz range have also been carefully examined, revealing the characteristic conical emission patterns at all frequencies.
Original languageEnglish
Article number9287
JournalOptics Express
Issue number6
Number of pages12
Publication statusPublished - 2023


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