Terahertz radiation generation by three-color laser pulses in air filament

authored by

V. Vaičaitis, O. Balachninaite, Uwe Morgner, Ihar Babushkin

Abstract

We demonstrated terahertz (THz) radiation generated from a three-color laser-excited filament in air for a wide tuning range and various wavelength ratios of the pump laser pulses. As a pump source, the radiation of the femtosecond Ti:sapphire laser and infrared output of the optical parametric generator were used. It was found that the spectrum of generated THz pulses spans up to 50 THz, while the overall THz generation efficiency is of an order of magnitude larger than the one produced by two-color pulses in an analogous configuration. Our results support the idea that three-color pulses are more suitable for broadband THz generation, since the corresponding waveforms can produce faster free electrons in larger quantities. We have found that the conversion efficiency is significantly limited due to intensity clamping. The spectral broadening of THz radiation is explained by aperiodicity of ionization events in time.

Organisation(s)

Institute of Quantum Optics
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines

External Organisation(s)

Vilnius University

Type

Article

Journal

Journal of Applied Physics

Volume

125

ISSN

0021-8979

Publication date

07.05.2019

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Physics and Astronomy

Electronic version(s)

https://zenodo.org/record/2669475#.Y2OoqIQxlPY (Access: Open)
https://doi.org/10.1063/1.5078683 (Access: Closed)