Acoustic impact on the Bessel light beams propagation in scattering media

Beliy, V.N., Kazak, N.S., Ropot, P.I., Khilo, N.A.

For Russian citation (Opticheskii Zhurnal):

Белый В.Н., Казак С.Н., Ропот П.И., Хило Н.А. Акустическое воздействие на распространение бесселевых световых пучков в рассеивающих средах // Оптический журнал. 2024. T. 91. № 7. С. 5–12. http://doi.org/10.17586/1023-5086-2024-91-07-5-12

Belyi V.N., Kazak N.S., Ropot P.I., Khilo N.A. Acoustic impact on the Bessel light beams propagation in scattering media [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 7. P. 5–12. http://doi.org/10.17586/1023-5086-2024-91-07-5-12

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Propagation of Bessel light beams in scattering media in conditions of acoustic interaction. Aim of study. Investigation of the speckle contrast reduction (“enlightment” of a scattering medium) in Bessel light beams propagation through a scattering medium by means of acoustic impact on this medium. Method. Suppression of speckle-structure by creating many statistically independent field realizations due to acoustic influence on scattering media. Main results. The influence of the properties of a scattering medium and the parameters of acoustic impact on the effect of speckle contrast reduction is investigated. The theoretical substantiation of the effect manifestation is proposed. It is based on the presence in the field of a Bessel light beam propagating in a scattering medium, a coherent component and additive noise. The coherent component occurs is caused by the self-reconstruction effect of the Bessel light beam. It is shown that the reduction of a speckle-structure is achieved via the acoustic impact, which maximize the number of statistically independent realizations of the speckle-field during image recording interval. In this way, it is demonstrated that both pulse or continuous acoustic impact can be an effective method for suppressing a noise component in a Bessel light beam. The article presents the results of an experimental study of the enlightment effect under conditions of Bessel light beams propagation in liquid scattering media. Practical significance. The observed effect of acoustically induced speckle contrast reduction in scattering media is of practical interest for transmitting optical images through them, for increasing the depth of tomographic vision, as well as for optical communication in free space.

Keywords:

Bessel light beam, axicon, acoustic impact, speckle contrast reduction

OCIS codes: 100.0100, 260.0260, 290.0290

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