Coherent subterahertz radiation from femtosecond infrared filaments in air

Abstract : 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.
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https://hal-polytechnique.archives-ouvertes.fr/hal-00463674
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Submitted on : Sunday, March 14, 2010 - 1:59:44 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Stellios Tzortzakis, Grégoire Méchain, G. Patalano, Yves-Bernard André, Bernard Prade, et al.. Coherent subterahertz radiation from femtosecond infrared filaments in air. Optics Letters, Optical Society of America, 2002, 27 (21), pp.1944-1946. ⟨10.1364/OL.27.001944⟩. ⟨hal-00463674⟩

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