Issue |
EPL
Volume 143, Number 1, July 2023
|
|
---|---|---|
Article Number | 10001 | |
Number of page(s) | 7 | |
Section | General physics | |
DOI | https://doi.org/10.1209/0295-5075/acdc4c | |
Published online | 27 June 2023 |
Remote terahertz spectroscopy from extended two-color plasma filaments: The ALTESSE 2 project
1 DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
2 Institut Lumière Matière, UMR 5306 Université Lyon 1, CNRS, Université de Lyon - 69622 Villeurbanne, France
3 Amplitude, Cité de la Photonique - 11 Avenue de la Canteranne, 33600 Pessac, France
4 CEA, DAM, DIF - 91297 Arpajon, France
5 Université Paris-Saclay, CEA, LMCE - 91680 Bruyères-le-Châtel, France
(a) E-mail: luc.berge@cea.fr (corresponding author)
Received: 1 April 2023
Accepted: 7 June 2023
Coherent time-domain spectroscopy (TDS) using terahertz radiation is valuable for fundamental science, security, and medical applications. This study investigates the performance of air-biased coherent detection terahertz spectroscopy (ABCD-THz) when an extended plasma filament is created in the air over long distances. We report on the latest results obtained within the follow-up of the ALTESSE project (Bergé L. et al., EPL, 126 (2019) 24001) whose objective is to measure a set of spectral signatures characterizing suspicious materials over meter-long distances. As one of the most critical steps towards routinely applying this technique, we verified the feasibility of a remote THz time-domain spectroscopy by loosely focusing two-color ultrashort laser pulses at more than 3 meters from the laser source. The absorption spectra of amino acids and explosives analyzed in such a filamentation geometry are compared with those obtained using a standard ABCD scheme where the plasma is generated at much shorter distances of .
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