High order Brunel harmonics and supercontinuum formed by a weak optical pump in presence of a strong terahertz field

verfasst von

Ihar Babushkin, Ayhan Demircan, Uwe Morgner, A. Savel'Ev

Abstract

Brunel harmonics appear in the optical response of an atom in process of laser-induced ionization, when the electron leaves the atom and is accelerated in the strong optical field. In contrast to recollision-based harmonics, the Brunel mechanism does not require the electron returning to the core. Here we show that in the presence of a strong ionizing terahertz (THz) field, even a weak driving field at the optical frequencies allow for generating Brunel harmonics effectively. The strong ionizing THz pump suppresses recollisions, making Brunel dominant in a wide spectral range. High-order Brunel harmonics may form a coherent carrier-envelope-phase insensitive supercontinuum, compressible into an isolated pulse with the duration down to 100 attoseconds.

Organisationseinheit(en)

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

Externe Organisation(en)

Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI)
Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS)

Typ

Preprint

Publikationsdatum

10.05.2021

Publikationsstatus

Elektronisch veröffentlicht (E-Pub)

Elektronische Version(en)

http://de.arxiv.org/abs/2105.04627 (Zugang: Offen)