Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators  

作　　者：吴季 梁力 屠科锋 李锟影 王梓 吕国强 Ji Wu;Li Liang;Kefeng Tu;Kunying Li;Zi Wang;Guoqiang Lü(School of Instrumentation and Opto-Electronics Engineering,Hefei University of Technology,Hefei 230009,China;CASTECH Inc.,Fuzhou 350003,China;National Engineering Laboratory of Special Display Technology,National Key Laboratory of Advanced Display Technology,Academy of Photoelectric Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]School of Instrumentation and Opto-Electronics Engineering,Hefei University of Technology,Hefei 230009,China [2]CASTECH Inc.,Fuzhou 350003,China [3]National Engineering Laboratory of Special Display Technology,National Key Laboratory of Advanced Display Technology,Academy of Photoelectric Technology,Hefei University of Technology,Hefei 230009,China

出　　处：《Chinese Optics Letters》2023年第3期77-83,共7页中国光学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Nos.2021YFB3602500 and 2021YFB3602502)。

摘　　要：In an acousto-optic modulator,the electrode shape plays an important role in performance,since it affects the distribution of the acoustic field.The acousto-optic modulator based on the conventional rectangular electrode has the problems of low energy efficiency and small modulation bandwidth due to an imperfect acoustic field.In this paper,a new serrated periodic electrode has been proposed for using acousto-optic modulator transducers.The proposed electrode has the following advantages.By using serrated periodic electrodes to suppress the sidelobes,the collimation of the acoustic field in the direction perpendicular to the light incidence is improved.This makes the acousto-optic modulator have a stable diffraction efficiency fluctuation and high energy efficiency.In addition,the electrode has a large divergence angle in the direction of light incidence,so a large bandwidth can be obtained.The simulations and experiments demonstrate that the serrated periodic electrode has an increased bandwidth and high energy efficiency.

关 键 词：acousto-optic modulator serrated periodic electrode large bandwidth low power consumption 

分 类 号：TN65[电子电信—电路与系统]