Springer Online Journal Archives 1860-2000
Abstract The frequency bands of acoustooptic devices can be extended appreciably by using multielement transducers in the form of multielement chains with variable parameters such as the grating step, phase shift per cell, piezolayer thickness, cell impedance, and electrode length of a single element. When the optimum law of variation of the parameters along the transducer length has been found, the law of variation of the angle of inclination of the acoustic wavefront can be accurately matched with the law of variation of the Bragg condition with frequency, which can increase the working frequency band of an acoustooptic device (in particular, a deflector) while maintaining a high diffraction efficiency. In the present paper a relationship obtained earlier to determine the frequency dependence of the structure step, which ensures accurate self-tuning to the Bragg angle, and also a solution of the dispersion equation obtained for one variant of a multielement structure are used to analyze the frequency dependence of the length of isolated electrodes, which determines the inductance of the element, and also the impedance of isolated cells contained in the multielement structure.
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