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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...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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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 |
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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 |
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