Volume 126, Number 2, April 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 June 2019|
Terahertz spectroscopy from air plasmas created by two-color femtosecond laser pulses: The ALTESSE project
1 CEA, DAM, DIF - 91297 Arpajon, France
2 DTU Fotonik - Department of Photonics Engineering, Technical University of Denmark DK-2800 Kongens Lyngby, Denmark
3 Institut franco-allemand de recherches de Saint-Louis - 5 rue du Général Cassagnou, 68300 Saint-Louis, France
4 Institut Lumière Matière, UMR 5306 Université Lyon 1 - CNRS, Université de Lyon - 69622 Villeurbanne, France
5 Department of Physics, University of Gothenburg - SE-412 96 Göteborg, Sweden
Received: 9 April 2019
Accepted: 6 May 2019
Terahertz pulses are very popular because of their numerous applications, for example in security. Located between microwaves and optical waves in the electromagnetic spectrum, their spectral domain can now be exploited for molecular spectroscopy using terahertz emission from plasmas formed by femtosecond laser pulses ionizing gases such as air. Downconversion of broadband optical spectra in a plasma produces intense radiation suitable for the detection of suspect materials remotely. The different physical mechanisms involved to create terahertz radiation by laser-matter interaction are reviewed. The new potentialities offered by intense ultrafast lasers allow the acquisition of unique spectral signatures characterizing various materials.
PACS: 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression / 32.80.Fb – Photoionization of atoms and ions / 52.38.-r – Laser-plasma interactions
© EPLA, 2019
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