Ultrabroad terahertz spectrum generation from an air-based filament plasma

V. A. Andreeva, O. G. Kosareva, N. A. Panov, D. E. Shipilo, P. M. Solyankin, M. N. Esaulkov, P. González De Alaiza Martínez, A. P. Shkurinov, V. A. Makarov, L. Bergé, S. L. Chin

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140 Scopus citations

Abstract

We have solved the long-standing problem of the mechanism of terahertz (THz) generation by a two-color filament in air and found that both neutrals and plasma contribute to the radiation. We reveal that the contribution from neutrals by four-wave mixing is much weaker and higher in frequency than the distinctive plasma lower-frequency contribution. The former is in the forward direction while the latter is in a cone and reveals an abrupt down-shift to the plasma frequency. Ring-shaped spatial distributions of the THz radiation are shown to be of universal nature and they occur in both collimated and focusing propagation geometries. Experimental measurements of the frequency-angular spectrum generated by 130-fs laser pulses agree with numerical simulations based on a unidirectional pulse propagation model.

Original languageEnglish (US)
Article number063902
JournalPhysical review letters
Volume116
Issue number6
DOIs
StatePublished - Feb 11 2016

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