Coherent subterahertz radiation from femtosecond infrared filaments in air

We report on what is believed to be the first observation of coherent subterahertz (sub-THz) emission from a 1-m string in the atmosphere. The sub-THz pulse emitted by the filamentary structure from an intense IR femtosecond laser pulse is detected perpendicularly to the laser propagation axis by us...

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Bibliographic Details
Published in:Optics letters 2002-11, Vol.27 (21), p.1944-1946
Main Authors: Tzortzakis, S, Méchain, G, Patalano, G, André, Y-B, Prade, B, Franco, M, Mysyrowicz, A, Munier, J-M, Gheudin, M, Beaudin, G, Encrenaz, P
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary:We report on what is believed to be the first observation of coherent subterahertz (sub-THz) emission from a 1-m string in the atmosphere. The sub-THz pulse emitted by the filamentary structure from an intense IR femtosecond laser pulse is detected perpendicularly to the laser propagation axis by use of two heterodyne detectors at 94+/-1 and 118+/-1GHz . We describe the characteristics of this emission and show evidence of constructive interference between two separate strings.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.27.001944