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

verfasst von

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.

Organisationseinheit(en)

Institut für Quantenoptik
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme

Externe Organisation(en)

Vilnius University

Typ

Artikel

Journal

Journal of Applied Physics

Band

125

ISSN

0021-8979

Publikationsdatum

07.05.2019

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Physik und Astronomie (insg.)

Elektronische Version(en)

https://zenodo.org/record/2669475#.Y2OoqIQxlPY (Zugang: Offen)
https://doi.org/10.1063/1.5078683 (Zugang: Geschlossen)