Acousto-optical spatial frequency filter with minimal acoustic power consumption

Kotov, V.M., Averin, S.V., Belousova, A.S., Karachevtseva, M.V., Bulyuk A.N., Voronko, A.I.

For Russian citation (Opticheskii Zhurnal):

Котов В.М., Аверин С.В., Белоусова А.С., Карачевцева М.В., Булюк А.Н., Воронко А.И. Акустооптический фильтр пространственных частот с минимальным потреблением акустической мощности // Оптический журнал. 2025. Т. 92. № 6. С. 87–96. http://doi.org/10.17586/1023-5086-2025-92-06-87-96

Kotov V.M., Averin S.V., Belousova A.S., Karachevtseva M.V., Bulyuk A.N., Voronko A.I. Acousto-optical spatial frequency filter with minimal acoustic power consumption [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 6. P. 87–96. http://doi.org/10.17586/1023-5086-2025-92-06-87-96

For citation (Journal of Optical Technology):

Abstract:

Subject of the study. The energy capabilities of acousto-optic tangent geometry Bragg diffraction for two-dimensional optical Fourier processing of optical images are investigated. Aim of study. To develop an acousto-optic spatial frequency filter made of paratellurite TeO₂ crystal that provides maximum resolution with minimum acoustic power consumption. Method. The method is based on the use of unique properties of paratellurite crystal, in particular, the anomalously low acoustic wave velocity. To increase the resolution, Bragg diffraction at a very low frequency is used. It turned out that diffraction at the minimum frequency is tangent geometry one. This makes it possible to best perform two-dimensional filtering of images during their optical Fourier processing. Thus, two goals are achieved simultaneously — maximum increase in the filter resolution and provision of the best conditions for two-dimensional image processing. Main results. An experimental model of the acousto-optic spatial frequency filter based on a paratellurite crystal has been developed and created, intended for two-dimensional processing of images transferred at a light wavelength of 633 nm. A two-dimensional image contour in the first diffraction order at a sound frequency of 9.9 MHz has been experimentally obtained. Practical significance. The developed filter allows processing two-dimensional images at a minimum sound frequency with minimally consumed acoustic power, while in combination with tangent geometry acousto-optic diffraction it becomes possible to perform operations on two-dimensional images with maximum resolution.

Keywords:

acousto-optic diffraction, Bragg regime, spatial frequency filter, two-dimensional optical image processing

Acknowledgements:

the work was carried out within the framework of the State assignment of the V.A. Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences № 075-00395-24-03 and № 075-00395-25-00

OCIS codes: 070.1060, 070.2615, 070.6110

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