High-order harmonics and supercontinua formed by a weak optical pump in the presence of an extreme terahertz field

verfasst von

I. Babushkin, A. Demircan, U. Morgner, A. Savel'Ev

Abstract

We show that in the presence of an extreme terahertz (THz) field an additional weak field in the optical frequency range can modulate ionization probability and thereby generate high-order harmonics. The extreme THz pump suppresses recollisions, thereby also fully suppressing the recollision-based harmonics. Nevertheless, high-order harmonics are effectively generated via an alternative mechanism, the so-called Brunel mechanism, based on ionization and subsequent acceleration in the driving field (but not on reabsorption). Using ab initio simulations for the hydrogen atom and short few-cycle optical driver, we show the appearance of a coherent carrier-envelope-phase-insensitive supercontinuum formed by such harmonics, compressible into an isolated pulse with 100-attosecond-scale duration.

Organisationseinheit(en)

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

Externe Organisation(en)

Lomonosov Moscow State University

Typ

Artikel

Journal

Physical Review A

Band

106

ISSN

2469-9926

Publikationsdatum

28.07.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atom- und Molekularphysik sowie Optik

Elektronische Version(en)

https://doi.org/10.48550/arXiv.2105.04627 (Zugang: Offen)
https://doi.org/10.1103/PhysRevA.106.013115 (Zugang: Geschlossen)