Abstract
The study examines aspects of the generation of the second optical harmonic in the centrosymmetric antiferromagnet NiO when exposed to narrowband terahertz pulses with an electric field strength on the order of 1 MV/cm. It was found that when exposed to terahertz pulses with a frequency of 1 THz, which corresponds to the antiferromagnetic resonance frequency of NiO, a significant decrease in the intensity of the second harmonic is observed versus exposure to pulses with a frequency of 1.5 THz. It is shown that the observed decrease in the intensity of second harmonic generation can be explained by multipath interference during the propagation of a narrowband terahertz pulse in a thin sample.
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ACKNOWLEDGMENTS
The experiments were carried out on the unique terawatt chromium–forsterite laser system (TCF “LTFC”) at the collective use center “Laser Femtosecond Complex” of the Joint Institute for High Temperatures of the Russian Academy of Sciences.
Funding
The study was carried out within the framework of the scientific program of the National Center for Physics and Mathematics (project “High Energy Densities Physics”) and with the support of the Ministry of Science and Higher Education of the Russian Federation (state task no. 075-01129-23-00).
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Chefonov, O.V., Ovchinnikov, A.V. & Agranat, M.B. Generation of the Second Optical Harmonic under the Action of Narrowband Terahertz Pulses in the Antiferromagnet NiO. High Temp 61, 846–851 (2023). https://doi.org/10.1134/S0018151X23060147
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DOI: https://doi.org/10.1134/S0018151X23060147