A N Bulyuk

Acousto-optic spatial frequency filter with minimal acoustic power consumption

Vladimir M. Kotov, Stanislav V. Averin, Anastasia S. Belousova, Maria V. Karachevtseva et autres

Subject of study . The energy capabilities of acousto-optic Bragg diffraction in tangent geometry for the two-dimensional (2D) optical Fourier processing of optical images are investigated. Aim of study . The aim of this study is to develop an acousto-optic spatial frequency …

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Differentiation and Integration of Images in Different Channels Using One Acousto-Optic Filter

Vladimir M. Kotov, Stanislav V. Averin, А. А. Зенкина, А. С. Белоусова et autres

Abstract We report a theoretical and experimental investigation of two-dimensional Fourier processing of an image using two channels when the image is differentiated in one channel and integrated in the other. Both operations are carried out by one acousto-optical (AO) spatial frequency …

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Amplitude Modulation of Two-Color Radiation at Double Sound Frequency

Vladimir M. Kotov, A N Bulyuk

Abstract For amplitude modulation of two-color optical radiation at a double sound frequency, it is proposed to use a device consisting of two identical acousto-optic (AO) cells operating at the same sound frequency and providing Bragg matching of two optical beams with …

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Pulse modulation of multicolored radiation of an argon laser

Vladimir M. Kotov, Stanislav V. Averin, A N Bulyuk, Alexander I. Voronko et autres

A method for calculating the parameters of a pulsed acousto-optic modulator of multicolored laser radiation is developed. The parameters make it possible to determine the optimal conditions for the modulation of a specified light spectrum at the maximum sound frequency. The method …

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Acousto-optic diffraction of multicolour Ar-laser radiation in crystalline quartz

Vladimir M. Kotov, Stanislav V. Averin, Alexander I. Voronko, Petr I. Kuznetsov et autres

We have studied acousto-optic Bragg diffraction of multicolour radiation, generated by an Ar laser in the blue-green region of the spectrum, on an acoustic wave propagating in crystalline quartz. It is shown that crystalline quartz significantly exceeds commonly used paratellurite in terms …

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Two-dimensional image edge enhancement by two-phonon Bragg diffraction

Vladimir M. Kotov, Gennady N. Shkerdin, A N Bulyuk

A model of acousto-optic interaction is developed for describing two-phonon Bragg diffraction in a gyrotropic single TeO 2 crystal, which makes allowance for ellipticity of crystal optical eigenwaves. Formation of a two-dimensional edge of an image in the first diffraction order is …

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An acoustooptical frequency shifter of speckle-containing optical radiation

Vladimir M. Kotov, Gennady N. Shkerdin, A N Bulyuk

The fundamental possibility of using the acoustooptic (AO) Bragg diffraction in problems of a frequency shift of a speckle-containing optical field both with and without field filtering for removing fine-grain background has been demonstrated. Two regimes of anisotropic diffraction observed in a …

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Spatial filtering of images with the use of double Bragg diffraction

Vladimir M. Kotov, Gennady N. Shkerdin, D. G. Shkerdin, Е. В. Котов et autres

The influence of acousto-optical Bragg diffraction on image characteristics is investigated theoretically and experimentally. It is shown that the zeroth, first, and second diffraction orders act, respectively, as high-, intermediate-, and low-spatial-frequency filters.

Decrease in the contrast of the speckle of the optical field using Bragg diffraction of light by sound

Vladimir M. Kotov, Gennady N. Shkerdin, D. G. Shkerdin, A N Bulyuk et autres

To decrease the contrast of the speckle of the optical field formed at the output of a multimode optical fibre, it is proposed to use the acoustooptical Bragg diffraction providing a collinear propagation of beams having different polarisation and diffracted to the …

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Electro-optic modulation and frequency translation of light in a gyrotropic medium

A N Bulyuk

The solution of coupled-mode equations is obtained for a strong coupling and a short interaction length. It is used in an analysis of electro-optic modulation in a gyrotropic or optically active medium. The gyrotropy and electro-optic interaction make it possible to transform …

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Radio-frequency electrooptic modulation in optical fibers

A N Bulyuk

The electrooptic interaction in single-mode optical fibers with both linear and circular birefringe is analyzed. In most cases, a large interaction length imposes a limit on the modulation frequency. A circular birefringence in an optical fiber may lead to an effective coupling …

Faraday fiber-optic magnetic field sensor

С. Н. Антонов, A N Bulyuk, Vladimir M. Kotov

The configuration of a fiber-optic magnetic field sensor of the distributed type was investigated. A planar configuration of the sensitive element overcame the principal shortcomings of a cylindrical distribution of the fiber in a sensor: it made it possible to tune the …