Journal
OPTICS LETTERS
Volume 48, Issue 12, Pages 3147-3150Publisher
Optica Publishing Group
DOI: 10.1364/OL.488971
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The terahertz radiation emitted by a biased air-based femtosecond filament has a different shape and frequency spectrum compared to the unbiased single-color and two-color schemes. The on-axis THz angular distribution at 0.5-1 THz transforms from a flat-top to a ring-shaped one at 10 THz when generated by a 15-kV/cm-biased filament in air produced by a 740-nm, 1.8-mJ, 90-fs pulse.
The terahertz (THz) radiation emitted by an air-based femtosecond filament biased by a static electric field is known to have on-axis shape and relatively low frequency spectrum in contrast to the unbiased single-color and two-color schemes. Here, we measure the THz emission of a 15-kV/cm-biased filament in air produced by a 740-nm, 1.8-mJ, 90-fs pulse and demonstrate that a flat-top on-axis THz angular distribution of the emission at 0.5-1 THz transforms into a contrast ring-shaped one at 10 THz. (c) 2023 Optica Publishing Group
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