Influence of tunnel ionization to third-harmonic generation of infrared femtosecond laser pulses in air

verfasst von

Viktorija Tamulienė, Greta Juškevičiūtė, Danas Buožius, Virgilijus Vaičaitis, Ihar Babushkin, Uwe Morgner

Abstract

Here we present an experimental as well as theoretical study of third-harmonic generation in tightly focused femtosecond filaments in air at the wavelength of 1.5μm. At low intensities, longitudinal phase matching is dominating in the formation of 3rd harmonics, whereas at higher intensities locked X-waves are formed. We provide the arguments that the X-wave formation is governed mainly by the tunnel-like ionization dynamics rather than by the multiphoton one. Despite of this fact, the impact of the ionization-induced nonlinearity is lower than the one from bound–bound transitions at all intensities.

Organisationseinheit(en)

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

Externe Organisation(en)

Vilnius University
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI)

Typ

Artikel

Journal

Scientific reports

Band

10

ISSN

2045-2322

Publikationsdatum

15.10.2020

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemein

Elektronische Version(en)

https://doi.org/10.1038/s41598-020-74263-x (Zugang: Offen)