Abstract

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.

© 2023 Optica Publishing Group

Flat-top THz directional diagram of a DC-biased filament

I. A. Nikolaeva, D. E. Shipilo, D. V. Pushkarev, G. E. Rizaev, D. V. Mokrousova, A. V. Koribut, Y. V. Grudtsyn, N. A. Panov, L. V. Seleznev, W. Liu, A. A. Ionin, and O. G. Kosareva
Opt. Lett. 46(21) 5497-5500 (2021)

Balance of emission from THz sources in DC-biased and unbiased filaments in air

D. E. Shipilo, I. A. Nikolaeva, D. V. Pushkarev, G. E. Rizaev, D. V. Mokrousova, A. V. Koribut, Ya. V. Grudtsyn, N. A. Panov, L. V. Seleznev, W. Liu, A. A. Ionin, and O. G. Kosareva
Opt. Express 29(25) 40687-40698 (2021)

Coherent generation and control of tunable narrowband THz radiation from a laser-induced air-plasma filament

Xiaoyue Zhou, Yuchen Lin, Yi Chan, Fu Deng, and Jingdi Zhang
Opt. Lett. 48(11) 2881-2884 (2023)

Terahertz emission pattern from a single-color filament plasma

Georgy E. Rizaev, Leonid V. Seleznev, Daria V. Mokrousova, Dmitrii V. Pushkarev, and Andrey A. Ionin
Opt. Lett. 47(22) 5917-5920 (2022)

Conical versus Gaussian terahertz emission from two-color laser-induced air plasma filaments

Christian Buhl Sørensen, Léo Guiramand, Jérôme Degert, Marc Tondusson, Esben Skovsen, Eric Freysz, and Emmanuel Abraham
Opt. Lett. 45(7) 2132-2135 (2020)