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Article

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

1
Institute of Optics and Quantum Electronics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
2
Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
3
Institute for Solid State Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
4
Institute for Photonics, Technical University Vienna, Gußhausstrasse. 25-29, 1040 Vienna, Austria
5
Fritz Haber Institute, Faradayway 4-6, 14195 Berlin, Germany
6
Department of Chemistry, University of California Berkeley, 237B Hildebrand Hall, Berkeley, CA 94720, USA
7
Lawrence Berkeley National Laboratory, Materials Sciences Division, Berkeley, CA 94720, USA
8
Abbe Center of Photonics, Friedrich Schiller University, Jena, Albert Einstein Straße 6, 07745 Jena, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2021, 11(1), 4; https://doi.org/10.3390/nano11010004
Received: 20 November 2020 / Revised: 15 December 2020 / Accepted: 15 December 2020 / Published: 22 December 2020
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. View Full-Text
Keywords: high harmonic generation (HHG); ZnO; thin film; ellipticity dependence; tunneling excitation high harmonic generation (HHG); ZnO; thin film; ellipticity dependence; tunneling excitation
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MDPI and ACS Style

Hollinger, R.; Herrmann, P.; Korolev, V.; Zapf, M.; Shumakova, V.; Röder, R.; Uschmann, I.; Pugžlys, A.; Baltuška, A.; Zürch, M.; Ronning, C.; Spielmann, C.; Kartashov, D. Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO. Nanomaterials 2021, 11, 4. https://doi.org/10.3390/nano11010004

AMA Style

Hollinger R, Herrmann P, Korolev V, Zapf M, Shumakova V, Röder R, Uschmann I, Pugžlys A, Baltuška A, Zürch M, Ronning C, Spielmann C, Kartashov D. Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO. Nanomaterials. 2021; 11(1):4. https://doi.org/10.3390/nano11010004

Chicago/Turabian Style

Hollinger, Richard, Paul Herrmann, Viacheslav Korolev, Maximilian Zapf, Valentina Shumakova, Robert Röder, Ingo Uschmann, Audrius Pugžlys, Andrius Baltuška, Michael Zürch, Carsten Ronning, Christian Spielmann, and Daniil Kartashov. 2021. "Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO" Nanomaterials 11, no. 1: 4. https://doi.org/10.3390/nano11010004

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