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本文将综述以Mason等效电路为基础的计算声光器件中压电换能器频率响应的理论,它对于声光器件中换能器的设计和性能测试是极重要的.本文将应用此理论对目前最重要的两种声光器件(36°Y切LN/PM和X切LN/TeO_2)以及各种镀层材料和厚度计算换能器捐耗TL随相对频率f/f_0的变化关系,由此可确定各镀层的厚度和器件的换能器带宽.本文还给出这两种器件的电输入阻抗Z_1在阻抗园图上随f/f_0变化的轨迹,它可作为器件性能测试的理论依据.
In this paper, the theory of calculating the frequency response of a piezoelectric transducer in an acousto-optical device based on the Mason equivalent circuit is reviewed, which is very important for the design and performance testing of the transducer in the acousto-optic device. For the two most important acousto-optic devices (36 ° Y-cut LN / PM and X-cut LN / TeO_2) and the variation of the donor TL for various coating materials and thickness calculations with the relative frequency f / f_0, This can determine the thickness of each coating and the transducer bandwidth of the device.This paper also gives the impedance of these two devices with the input impedance Z_1 in the impedance map with f / f_0 trajectory, which can be used as a theoretical basis for device performance testing .