The effect of speckle rotation at the interference of optical vortices and waveguide modes of an optical fiber

For Russian citation (Opticheskii Zhurnal):

Кизеветтер Д.В., Ильин Н.В. Эффект поворота спеклов при интерференции оптических вихрей и волноводных мод волоконного световода // Оптический журнал. 2024. Т. 91. № 8. С. 3–13. http://doi.org/10.17586/1023-5086-2024-91-08-3-13

Kiesewetter D.V., Ilyin N.V. The effect of speckle rotation at the interference of optical vortices and waveguide modes of an optical fiber [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 8. P. 3–13. http://doi.org/10.17586/1023-5086-2024-91-08-3-13

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Interference of waveguide modes and optical vortices in multimode optical fibers and free space, as well as speckle structures resulting from such interference. Aim of study. Creation of the simplest physical model to explain the effect of rotation of speckles formed by the outgoing radiation of a multimode fiber when moving the observation plane and estimation of speckle rotation parameters based on the experimental study. Method. Numerical simulation of the effect was performed in the approximation of linearly polarized mode groups for waveguide modes and optical vortices of a multimode optical fiber with a step index profile. For the experimental study, optical vortices and waveguide modes of the optical fiber were excited by an oblique focused laser beam shifted relative to the axis. The outgoing radiation was projected onto the photodetector matrix of
the camera. The intensity distribution of the outgoing radiation at different distance from the camera to the focusing lens were obtained. Main results. The effect of rotation of speckles resulting from interference of optical vortices and the main waveguide mode during longitudinal movement along the axis of the fiber is explained using the simplest physical model. It is shown that the obtained results of numerical simulation can be generalized to the more general case of interference of various waveguide
modes and vortices. The effect of rotation of speckles of radiation coming out of the optical fiber when moving the observation plane has been experimentally confirmed. The trajectory of the motion of the speckles when moving the observation plane near the lens focus was visualized and determined, and the rotation parameters were calculated. Practical significance. The results obtained in this work can be used to design fiber-optic sensors, in particular speckle interferometers.

Keywords:

fiber, optical vortex, speckle, interference, numerical modeling

OCIS codes: 060.2310, 120.6150

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