Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response
Difference-frequency generation is a well-known method of obtaining IR and THz radiation. It has many practical applications, such as sensing, optical metrology, diagnostics, detection and identification of substances, etc. One of the generation methods is based on the three-wave interaction in a me...
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MDPI AG
2022-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/8/3891 |
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| author | Vyacheslav A. Trofimov Dmitry M. Kharitonov Mikhail V. Fedotov Yongqiang Yang |
| author_facet | Vyacheslav A. Trofimov Dmitry M. Kharitonov Mikhail V. Fedotov Yongqiang Yang |
| author_sort | Vyacheslav A. Trofimov |
| collection | DOAJ |
| description | Difference-frequency generation is a well-known method of obtaining IR and THz radiation. It has many practical applications, such as sensing, optical metrology, diagnostics, detection and identification of substances, etc. One of the generation methods is based on the three-wave interaction in a medium with second-order nonlinear susceptibility. In this study, we investigated a special case of the frequency down-conversion into IR and THz ranges of the frequencies: the frequencies of interacting waves were multiple. We analyzed theoretically two cases of three-wave interactions: amplification of the infrared (or THz) radiation (incident weak intensity of a wave at this frequency) and a wave generation with the difference-frequency (incident zero-value intensity at this frequency). The amplification efficiency could achieve 75% and the maximal frequency conversion efficiency is about 25%. The computer simulation results made for the femtosecond pulse interaction in a crystal with the wavelength 4, 10, and 24 μm demonstrates applicability of such a scheme for the frequency down-conversion. This scheme of the THz radiation generation is a perspective tool for its application in the screening system for the detection and identification of substances. |
| first_indexed | 2024-03-09T11:12:17Z |
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| id | doaj.art-b172c90f18594a6d807e7fd659cef3b6 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T11:12:17Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-b172c90f18594a6d807e7fd659cef3b62023-12-01T00:40:58ZengMDPI AGApplied Sciences2076-34172022-04-01128389110.3390/app12083891Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear ResponseVyacheslav A. Trofimov0Dmitry M. Kharitonov1Mikhail V. Fedotov2Yongqiang Yang3School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, ChinaFaculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskye Gory, Moscow 119992, RussiaFaculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskye Gory, Moscow 119992, RussiaSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, ChinaDifference-frequency generation is a well-known method of obtaining IR and THz radiation. It has many practical applications, such as sensing, optical metrology, diagnostics, detection and identification of substances, etc. One of the generation methods is based on the three-wave interaction in a medium with second-order nonlinear susceptibility. In this study, we investigated a special case of the frequency down-conversion into IR and THz ranges of the frequencies: the frequencies of interacting waves were multiple. We analyzed theoretically two cases of three-wave interactions: amplification of the infrared (or THz) radiation (incident weak intensity of a wave at this frequency) and a wave generation with the difference-frequency (incident zero-value intensity at this frequency). The amplification efficiency could achieve 75% and the maximal frequency conversion efficiency is about 25%. The computer simulation results made for the femtosecond pulse interaction in a crystal with the wavelength 4, 10, and 24 μm demonstrates applicability of such a scheme for the frequency down-conversion. This scheme of the THz radiation generation is a perspective tool for its application in the screening system for the detection and identification of substances.https://www.mdpi.com/2076-3417/12/8/3891frequency down-conversioncascading processesinfrared opticsterahertz optics |
| spellingShingle | Vyacheslav A. Trofimov Dmitry M. Kharitonov Mikhail V. Fedotov Yongqiang Yang Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response Applied Sciences frequency down-conversion cascading processes infrared optics terahertz optics |
| title | Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response |
| title_full | Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response |
| title_fullStr | Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response |
| title_full_unstemmed | Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response |
| title_short | Frequency Down-Conversion of Optical Pulse to the Far Infrared and THz Frequency Ranges Due to the Cascading Process in a Medium with a Quadratic Nonlinear Response |
| title_sort | frequency down conversion of optical pulse to the far infrared and thz frequency ranges due to the cascading process in a medium with a quadratic nonlinear response |
| topic | frequency down-conversion cascading processes infrared optics terahertz optics |
| url | https://www.mdpi.com/2076-3417/12/8/3891 |
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