Demonstration of nonperturbative and perturbative third-harmonic generation in MgO by altering the electronic structure

Mukhtar Hussain, Fernando Lima, Willem Boutu, Hamed Merdji, Marta Fajardo, and Gareth O. Williams
Phys. Rev. A 105, 053103 – Published 2 May 2022

Abstract

The surge of interest in nonperturbative high-harmonic generation in solids has been driven by the appeal of compact solid-state extreme ultraviolet sources and the prospect of untangling the material properties through high-harmonic generation response to strong fields. The traditional assumption is that the brighter, lower-order harmonics are purely perturbative in nature. However, the border between the perturbative and nonperturbative regimes often remains unclear. Here, we show that third-harmonic generation (THG) using 800-nm, 40-fs pulses displays a nonperturbative response in a wide-band-gap insulator MgO. Furthermore, we show that with the introduction of dopants, the nonperturbative THG reverts to the perturbative behavior. We attribute this to the blocking of intraband oscillations and the increased linear absorption pathways introduced by the dopant energy levels.

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  • Received 14 December 2021
  • Accepted 15 April 2022

DOI:https://doi.org/10.1103/PhysRevA.105.053103

©2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Mukhtar Hussain1,*, Fernando Lima1, Willem Boutu2, Hamed Merdji2, Marta Fajardo1, and Gareth O. Williams1,†

  • 1GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
  • 2LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France

  • *Also at Department of Physics, University of Central Florida, Florida 32816, USA; mukhtar.hussain@ucf.edu
  • gareth.williams@tecnico.ulisboa.pt

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Issue

Vol. 105, Iss. 5 — May 2022

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