Two-dimensional feature extraction and beam fanning suppression using acousto-optics

Poon, Ting‐Chung; Banerjee, Partha P.

doi:10.1117/12.447618

SPIE Proceedings

2001

DOI: 10.1117/12.447618

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Two-dimensional feature extraction and beam fanning suppression using acousto-optics

Ting‐Chung Poon

Partha P. Banerjee

Abstract: We review the role of acousto-optic (AO) Bragg modulators in spatial filtering. For lowpass spatial filtering, we use the Bragg-scattered beam, whereas for highpass filtering, we employ the forward-scattered beam. Using the forward-scatterd beam results in cross-derivative operation applications when two orthogonally oriented AO Bragg modulators are used. Using the Bragg-scattered beam, we propose suppression of beam fanning countered in nonlinear optics. In most cases our theory is verified by experimental re… Show more

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Optical image processing by means of acousto-optic spatial filtration

Balakshy¹,

Voloshinov²,

Babkina³

et al. 2005

Journal of Modern Optics

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Results are presented of a theoretical and experimental study of a new method of optical image processing based on two-dimensional acoustooptic filtration of the spatial spectrum of images. Most attention is concentrated on the analysis of the acousto-optic cell transfer function form and its dependence on crystal cut, geometry of acousto-optic interaction and ultrasound frequency. Results of computer simulation of acousto-optic spatial filtering are illustrated by the example of an object in the form of an amplitude grating. Experiments investigating the transfer functions of acousto-optic cells with collinear and tangential geometry of acousto-optic interaction are described. Acousto-optic image processing is demonstrated experimentally using the example of the edge enhancement effect for some elementary images. IntroductionAt the present time, acousto-optic (AO) methods of light beam regulation find wide applications in many areas of science and technology. Numerous investigations have proved the high efficiency of AO regulation of amplitude, frequency, phase and polarization of optical waves [1][2][3]. Due to the high speed of operation, reliability and simplicity of design, AO devices, such as modulators, deflectors and filters, have become common instruments in every laboratory.However, the potential of acousto-optics is not limited to the applications mentioned. The AO interaction effect makes it possible to control the structure of an optical beam passing through an AO cell. This peculiarity represents a basis for AO processing of images. The possibility of the application of AO interaction to optical image structure control was first pointed out in 1984 [4]. It has been proved that the AO cell operates as a filter of spatial frequencies with respect to the input optical signal (optical image). The transfer function of the spatial filter reflects selective properties of the AO interaction. The particular form of the transfer function depends on the structure of the acoustic field in the cell and on the AO interaction geometry. It has been shown that with the help of the AO cell, classic types of image processing can be fulfilled, including differentiation and integration of images as well as visualization of phase objects [5][6][7]. In comparison with other known methods of image processing [8-10], the AO method possesses a number of advantages. AO spatial filters are not sensitive to the position they are installed in in an optical system; they do not require precise adjustment and additional optics for Fourier spectrum formation; the devices are capable of processing both

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Optical image processing by means of acousto-optic spatial filtration

Balakshy¹,

Voloshinov²,

Babkina³

et al. 2005

Journal of Modern Optics

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Acousto-optic image processing

Balakshy

Kostyuk

2008

Appl. Opt.

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Acousto-optic processing of images is based on the angular selectivity of acousto-optic interaction resulting in spatial filtration of the image spectrum. We present recent theoretical and experimental investigations carried out in this field. Much attention is given to the analysis of the acousto-optic cell transfer function form depending on the crystal cut, the geometry of acousto-optic interaction, and the ultrasound frequency. Computer simulation results of the two-dimensional acousto-optic spatial filtration of some elementary images are presented. A new method of phase object visualization is suggested and examined that makes it possible to separate amplitude and phase information contained in an optical image. The potentialities of the acousto-optic image processing are experimentally demonstrated by examples of edge enhancement and optical wavefront visualization effects.

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Acousto-optic visualization of optical wavefronts [Invited]

Balakshy

2018

Appl. Opt.

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The paper presents a short survey on theoretical and experimental investigations of an acousto-optic (AO) method of optical wavefront visualization proposed and developed at Moscow State University. The method is based on angular selectivity of Bragg diffraction. It is shown that distribution of light intensity in the visualized image is proportional to the phase gradient in the AO interaction plane. Spatial resolution and contrast of the visualized image are determined primarily by the divergence angle of the acoustic beam. Most attention in the paper is concentrated on the problem of AO visualization of two-dimensional phase objects. The important advantage of the AO method consists of the possibility of optical field phase-structure registration in the presence of amplitude modulation of the initial optical field. Examples of computer simulations as well as some experimental results are presented for illustration of the potentialities of this method.

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Two-dimensional feature extraction and beam fanning suppression using acousto-optics

Cited by 3 publications

References 2 publications

Optical image processing by means of acousto-optic spatial filtration

Optical image processing by means of acousto-optic spatial filtration

Acousto-optic image processing

Acousto-optic visualization of optical wavefronts [Invited]

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