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ISSN: 1023-5086

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ISSN: 1023-5086

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Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2024-91-04-3-15

УДК: 535.015, 535.421

Identification of Hermite–Gaussian and Bessel modes of terahertz beam with diffractive optical elements

Osintseva N.D., Gerasimov V.V., Choporova Y.Y., Kukotenko V.D., Pavelyev V.S., Knyazev B.A.

Full text on elibrary.ru

For Russian citation (Opticheskii Zhurnal):

Осинцева Н.Д., Герасимов В.В., Чопорова Ю.Ю., Кукотенко В.Д., Павельев В.С., Князев Б.А. Идентификация эрмит-гауссовых и бесселевых мод терагерцового пучка с помощью дифракционных оптических элементов // Оптический журнал. 2024. Т. 91. № 4. С. 3–15. https://orcid.org/10.17586/1023-5086-2024-91-04-3-15

 

Osintseva N.D., Gerasimov V.V., Choporova Yu.Yu., Kukotenko V.D., Pavelyev V.S., Knyazev B.A. Identification of Hermite–Gaussian and Bessel modes of terahertz beam with diffractive optical elements [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 4. P. 3–15. http://doi.org/10.17586/1023-5086-2024-91-04-3-15

For citation (Journal of Optical Technology):
-
Abstract:

Subject of study. A technique for identifying Hermite–Gaussian and Bessel modes using diffractive optical elements has been investigated in a terahertz range. The aim of study is the development and testing of a method for identifying the mode composition of the terahertz radiation beam using binary phase diffraction optical elements for single-mode and multimode cases. Method. The proposed approach is based on the correlation filtering method. A beam with a high content of the mode under study was formed using the binary phase diffractive element, and then it illuminated the filter system consisting of the similar element and lens. If the modes, with which the forming and filtering elements were matched, a bright spot in the center, the so-called positive response, was observed. Otherwise, radially symmetrically located petals with a dark spot in the center were observed in the center, which corresponds to a negative response. Main results. The experimental results on identification of Hermite-Gaussian modes (with numbers (1, 0) and (0, 1)) and Bessel modes (with topological charge modulus
|l| = 1, 2, 3, 4) in the case of the single-mode beam are presented. For the case of the multimode beam, a combination of Bessel beams with topological charges –1 and –2 was formed. Practical significance. The wireless data transmission at terahertz frequencies (the target frequency range of the next generation of 6G communications) using multimode Bessel beams will allow to significantly increase the information density of transmitted data and to achieve speeds of the order of Tbit/s. The method described in the work can be used for decoding the signals transmitted in a multimode beam.

Keywords:

terahertz range, diffraction optics, phase axicon, beams Bessel, Hermite-Gauss beams, optical vortices

Acknowledgements:

the authors express their gratitude to G.N. Kulipanov and N.A. Vinokurov for supporting the work, the free electron laser team for ensuring stable operation of the installation and N.A. Nikolaev for useful recommendations and  assistance in reviewing the manuscript. The work was carried out at the shared research center “Siberian Synchrotron and Terahertz Radiation Center” on the basis of the unique scientific installation “Novosibirsk FEL” at the BINP SB RAS.

OCIS codes: 050.1380, 070.6110, 140.2600

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