【作者】 梁华伟；

【导师】 石顺祥；

【作者基本信息】 西安电子科技大学 ， 物理电子学， 2006， 硕士

【摘要】 光学相控阵扫描技术是一种无惯性、高分辨率、易于程序控制的光束扫描技术。光波导阵列电光扫描器是一种新型的光学相控阵,与其它扫描器件相比,它具有扫描速度快、驱动电压低、扫描范围大等优点。本论文根据实际工作的需要,对光波导阵列电光扫描器进行了理论和实验研究,在前期研究的基础上,主要进行了以下研究工作：1.从光栅衍射原理和晶体电光效应原理出发,研究了光波导阵列电光扫描器的工作原理、工作特性和馈电方案。2.利用光波导模式理论分析了光波导中光场的模式特性,并研究了光波导效应对辐射特性的影响。3.采用有限差分光束传输法(FD-BPM)深入系统地研究了波导耦合对光波导阵列的传输特性、辐射特性和扫描特性的影响。并根据实际应用的需要,进一步研究了光波导阵列结构的优化设计。4.对十层GaAs\AlGaAs光波导阵列电光扫描器进行了实验,实现了低驱动电压、大范围光束扫描,最大光束偏转角为13.6°。实验中出现了一些与理论上有明显差别的现象,在此对其进行了分析讨论,并提出了改进建议。更多还原

【Abstract】 Optical phased arrays provide an elegant means for the inertialess, high-resolution random-access beam scanning. Optical waveguide array electro-optic scanners are a novel kind of optical phased arrays. Compared with other scanners, these scanners are of the advantage of quick, wide-angle scanning but requiring low drive voltage. According to the practical demand, theoretical and experimental characteristics of the optical waveguide array electro-optic scanners are studied. The main study work is as follow:Firstly, based on the theory of optical grating and the principle of electro-optic effect of crystal, the operating principle, the operating characteristics and the priciple of electrical feedback of the optical waveguide array electro-optical scanners are discussed.Secondly, based on the optical waveguide mode theory, the mode characteristics of beam in optical waveguide and the effect of optical waveguide characteristics on far-field pattern are investigated.Thirdly, the effects of the mutual coupling among waveguides on propagating, radiating and scanning characteristics of optical waveguide arrays are studied in detail. What is more, the optimal stucture of optical waveguide arrays is discussed.Finally, a 10-element optical AIGaAs-based waveguide array electro-optic scanner is used in our experiment. The wide-angle scanning (13.6°) requiring low driving voltage (<10V) is realized. However, the performance of the scanner is not as good as the expected from theoretical principle. Some unwilling phenomenons in experiment is analyzed and some advice for improving this performance is provided.更多还原