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Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation

Infrared and THz optics has many promising practical applications such as in spectroscopy, diagnostic, optical metrology, sensing, and many others. Due to limited number of IR radiation sources, the frequency down-conversion processes are widely used for obtaining infrared radiation. Among them, the...

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Autores principales: Trofimov, Vyacheslav A., Kharitonov, Dmitry M., Fedotov, Mikhail V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9565718/
https://www.ncbi.nlm.nih.gov/pubmed/36240171
http://dx.doi.org/10.1371/journal.pone.0268228
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author Trofimov, Vyacheslav A.
Kharitonov, Dmitry M.
Fedotov, Mikhail V.
author_facet Trofimov, Vyacheslav A.
Kharitonov, Dmitry M.
Fedotov, Mikhail V.
author_sort Trofimov, Vyacheslav A.
collection PubMed
description Infrared and THz optics has many promising practical applications such as in spectroscopy, diagnostic, optical metrology, sensing, and many others. Due to limited number of IR radiation sources, the frequency down-conversion processes are widely used for obtaining infrared radiation. Among them, the most applicable method is a generation of wave with difference frequency under the three-waves interaction in a medium with quadratic nonlinear response. Below we propose a new effective tool for three times decreasing frequency of the incident pulse based on three-waves interaction in a medium with the quadratic susceptibility. At such interaction, a medium’s response inherent cubic non-linearity appears due to so-called cascading SHG. The frequency down-conversion process possesses two stable modes. This is shown using multi-scale method. For each of the modes, the analytical solution is developed in the framework of the long pulse duration approximation without using the pump energy non-depletion approximation. The computer simulation results confirm those of analytical analysis. We show that the conversion efficiency of the incidentpump pulse energy achieves about 70%, if the low frequency wave incident intensity equals zero, or almost 100%, if the incident intensity of the low frequency wave is non-zero. The developed theoretical approach may be applied to other processes of the frequency down-conversion.
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spelling pubmed-95657182022-10-15 Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation Trofimov, Vyacheslav A. Kharitonov, Dmitry M. Fedotov, Mikhail V. PLoS One Research Article Infrared and THz optics has many promising practical applications such as in spectroscopy, diagnostic, optical metrology, sensing, and many others. Due to limited number of IR radiation sources, the frequency down-conversion processes are widely used for obtaining infrared radiation. Among them, the most applicable method is a generation of wave with difference frequency under the three-waves interaction in a medium with quadratic nonlinear response. Below we propose a new effective tool for three times decreasing frequency of the incident pulse based on three-waves interaction in a medium with the quadratic susceptibility. At such interaction, a medium’s response inherent cubic non-linearity appears due to so-called cascading SHG. The frequency down-conversion process possesses two stable modes. This is shown using multi-scale method. For each of the modes, the analytical solution is developed in the framework of the long pulse duration approximation without using the pump energy non-depletion approximation. The computer simulation results confirm those of analytical analysis. We show that the conversion efficiency of the incidentpump pulse energy achieves about 70%, if the low frequency wave incident intensity equals zero, or almost 100%, if the incident intensity of the low frequency wave is non-zero. The developed theoretical approach may be applied to other processes of the frequency down-conversion. Public Library of Science 2022-10-14 /pmc/articles/PMC9565718/ /pubmed/36240171 http://dx.doi.org/10.1371/journal.pone.0268228 Text en © 2022 Trofimov et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Trofimov, Vyacheslav A.
Kharitonov, Dmitry M.
Fedotov, Mikhail V.
Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title_full Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title_fullStr Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title_full_unstemmed Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title_short Frequency down-conversion based on optical cascading process—New effective way for generation of far infrared or THz radiation
title_sort frequency down-conversion based on optical cascading process—new effective way for generation of far infrared or thz radiation
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9565718/
https://www.ncbi.nlm.nih.gov/pubmed/36240171
http://dx.doi.org/10.1371/journal.pone.0268228
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