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

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 throughhigh-harmonic generation response to strong fields. The traditional assumption is...

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Bibliographic Details
Published in:Physical review. A 2022-05, Vol.105 (5), Article 053103
Main Authors: Hussain, Mukhtar, Lima, Fernando, Boutu, Willem, Merdji, Hamed, Fajardo, Marta, Williams, Gareth O.
Format: Article
Language:English
Subjects:
Chemical Physics
Chemical Sciences
Mechanics
Mechanics of materials
or physical chemistry
Physics
Theoretical and
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Summary: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 throughhigh-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 nonperturbativeregimes 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 blockingof intraband oscillations and the increased linear absorption pathways introduced by the dopant energy levels
ISSN:2469-9926
2469-9934
DOI:10.1103/PhysRevA.105.053103