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JOURNALS // Optics and Spectroscopy // Archive

Optics and Spectroscopy, 2023 Volume 131, Issue 8, Pages 1122–1127 (Mi os1425)

Fiber and integrated optics

Process in multimode fiber optical vortices and the study features of the interference of their excitation

A. A. Makovetskii, A. A. Zamyatin

Kotelnikov Institute of Radioengineering and Electronics, Fryazino Branch, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia

Abstract: Experiments on excitation of meridional rays and optical vortices in short silica-polymer optical fibers were carried out using a laser ($\lambda$ = 532 nm) and lenses with different numerical aperture values. For research, we have drawn out samples of optical fibers with a core diameter of 200–800 $\mu$ microns and a reflective shell made of various polymers. In experiments, under different excitation conditions, radiation intensity distributions were recorded at the output end of the optical fiber (in the near field) and in the far field. Caustic control allowed to excite different groups of optical vortices in and observe various topologies of intermode interference, including spiral structures. A qualitative analysis of the experimental results was carried out.

Keywords: multimode optical fiber, radiation intensity distributions in near and far fields, optical vortices, caustics, intermode interference.

Received: 16.12.2022
Revised: 10.05.2023
Accepted: 10.05.2023

DOI: 10.61011/OS.2023.08.56305.4454-23



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