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Article title CORRECTION OF THE AMPLITUDE-FREQUENCY CHARACTERISTIC OF AN ACOUSTOOPTICAL DEFLECTOR WITH A GAP PIEZO TRANSDUCER
Authors D. P. Volik
Section SECTION IV. RADIO ENGINEERING AND ACOUSTICS
Month, Year 02, 2018 @en
Index UDC 621.372
DOI 10.23683/2311-3103-2018-2-174-184
Abstract For an acousto-optic deflector of the microwave range of wavelengths in which ultrasound is excited from the surface of a piezoelectric crystal-lithium niobate by a gap piezoelectric transducer, the possibility of correcting the main parameters of its amplitude-frequency characteristic is analyzed. The control of the amplitude-frequency characteristic and, in particular, the widening of the band of operating frequencies, as well as the suppression of parasitic transmission bands, are carried out by forming the corresponding amplitude distribution of the electric and acoustic fields in the space between the planar electrodes. Several special cases of the distribution of the generated field, decreasing from the center to the edges in the direction of the incident light, of the electrodynamic ultrasound-exciting structure are analyzed according to the linear law, the cosine-on-pedestal law, and the Gauss"s law. For these distributions, the shapes of the amplitude-frequency characteristics and their differences from the traditional one, described by a function of the form [sin(x)/x]2, which is formed by a unapodized gap surface piezo transducer are analyzed. It shown is that the degree of suppression of parasitic transmission bands of an acousto-optic deflector can be of the order of (30–40) dB, with an increase in the band of operating frequencies for different distributions from 10 % to 30 %, accompanied by a slight decrease in diffraction efficiency. Proposed are the constructions of piezoelectric transducers that allow providing the investigated field distributions, the production of which can be realized by standard microelectronics methods widely used in the manufacture of devices on surface acoustic waves.

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Keywords Acoustooptical deflector; gap piezo transducer; surface excitation of ultrasound; lithium niobate; apodization; amplitude-frequency characteristic.
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