Cargando…

Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

The generation of high order harmonics from femtosecond mid-IR laser pulses in ZnO has shown great potential to reveal new insight into the ultrafast electron dynamics on a few femtosecond timescale. In this work we report on the experimental investigation of photoluminescence and high-order harmoni...

Descripción completa

Detalles Bibliográficos
Autores principales: Hollinger, Richard, Herrmann, Paul, Korolev, Viacheslav, Zapf, Maximilian, Shumakova, Valentina, Röder, Robert, Uschmann, Ingo, Pugžlys, Audrius, Baltuška, Andrius, Zürch, Michael, Ronning, Carsten, Spielmann, Christian, Kartashov, Daniil
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7822178/
https://www.ncbi.nlm.nih.gov/pubmed/33375116
http://dx.doi.org/10.3390/nano11010004
_version_ 1783639573242314752
author Hollinger, Richard
Herrmann, Paul
Korolev, Viacheslav
Zapf, Maximilian
Shumakova, Valentina
Röder, Robert
Uschmann, Ingo
Pugžlys, Audrius
Baltuška, Andrius
Zürch, Michael
Ronning, Carsten
Spielmann, Christian
Kartashov, Daniil
author_facet Hollinger, Richard
Herrmann, Paul
Korolev, Viacheslav
Zapf, Maximilian
Shumakova, Valentina
Röder, Robert
Uschmann, Ingo
Pugžlys, Audrius
Baltuška, Andrius
Zürch, Michael
Ronning, Carsten
Spielmann, Christian
Kartashov, Daniil
author_sort Hollinger, Richard
collection PubMed
description The generation of high order harmonics from femtosecond mid-IR laser pulses in ZnO has shown great potential to reveal new insight into the ultrafast electron dynamics on a few femtosecond timescale. In this work we report on the experimental investigation of photoluminescence and high-order harmonic generation (HHG) in a ZnO single crystal and polycrystalline thin film irradiated with intense femtosecond mid-IR laser pulses. The ellipticity dependence of the HHG process is experimentally studied up to the 17th harmonic order for various driving laser wavelengths in the spectral range 3–4 µm. Interband Zener tunneling is found to exhibit a significant excitation efficiency drop for circularly polarized strong-field pump pulses. For higher harmonics with energies larger than the bandgap, the measured ellipticity dependence can be quantitatively described by numerical simulations based on the density matrix equations. The ellipticity dependence of the below and above ZnO band gap harmonics as a function of the laser wavelength provides an efficient method for distinguishing the dominant HHG mechanism for different harmonic orders.
format Online
Article
Text
id pubmed-7822178
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-78221782021-01-23 Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO Hollinger, Richard Herrmann, Paul Korolev, Viacheslav Zapf, Maximilian Shumakova, Valentina Röder, Robert Uschmann, Ingo Pugžlys, Audrius Baltuška, Andrius Zürch, Michael Ronning, Carsten Spielmann, Christian Kartashov, Daniil Nanomaterials (Basel) Article The generation of high order harmonics from femtosecond mid-IR laser pulses in ZnO has shown great potential to reveal new insight into the ultrafast electron dynamics on a few femtosecond timescale. In this work we report on the experimental investigation of photoluminescence and high-order harmonic generation (HHG) in a ZnO single crystal and polycrystalline thin film irradiated with intense femtosecond mid-IR laser pulses. The ellipticity dependence of the HHG process is experimentally studied up to the 17th harmonic order for various driving laser wavelengths in the spectral range 3–4 µm. Interband Zener tunneling is found to exhibit a significant excitation efficiency drop for circularly polarized strong-field pump pulses. For higher harmonics with energies larger than the bandgap, the measured ellipticity dependence can be quantitatively described by numerical simulations based on the density matrix equations. The ellipticity dependence of the below and above ZnO band gap harmonics as a function of the laser wavelength provides an efficient method for distinguishing the dominant HHG mechanism for different harmonic orders. MDPI 2020-12-22 /pmc/articles/PMC7822178/ /pubmed/33375116 http://dx.doi.org/10.3390/nano11010004 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hollinger, Richard
Herrmann, Paul
Korolev, Viacheslav
Zapf, Maximilian
Shumakova, Valentina
Röder, Robert
Uschmann, Ingo
Pugžlys, Audrius
Baltuška, Andrius
Zürch, Michael
Ronning, Carsten
Spielmann, Christian
Kartashov, Daniil
Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title_full Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title_fullStr Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title_full_unstemmed Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title_short Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO
title_sort polarization dependent excitation and high harmonic generation from intense mid-ir laser pulses in zno
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7822178/
https://www.ncbi.nlm.nih.gov/pubmed/33375116
http://dx.doi.org/10.3390/nano11010004
work_keys_str_mv AT hollingerrichard polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT herrmannpaul polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT korolevviacheslav polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT zapfmaximilian polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT shumakovavalentina polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT roderrobert polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT uschmanningo polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT pugzlysaudrius polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT baltuskaandrius polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT zurchmichael polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT ronningcarsten polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT spielmannchristian polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno
AT kartashovdaniil polarizationdependentexcitationandhighharmonicgenerationfromintensemidirlaserpulsesinzno