设计了一种四电极八边形结构的铌酸锂电光偏转器。仿真分析了四电极八边形结构和理想电极结构偏转器的电场分布特性,讨论了结构参数对偏转器电场分布、场强梯度和有效通光口径比的影响,并给出了四电极八边形偏转器结构参数的选取方法。仿真结果表明,在相同的晶体和施加电压下,近轴区域内四电极八边形结构与理想电极结构偏转器的电场分布一致,场强误差小于10%。根据分析结果,制备了八边形铌酸锂晶体电光偏转器。实验结果表明,该偏转器的偏转灵敏度为0.312 μrad/V,与理论计算结果(0.340 μrad/V)相吻合。

An octagonal structure lithium niobate electro-optic deflector with quadrupole electrodes is designed in this paper. The electric field distribution characteristics of the octagonal structural deflector with quadrupole electrodes and ideal electrode structure are simulated and analyzed. The influences of structural parameters on the electric field distribution, field intensity gradient, and effective aperture ratio of the deflector are discussed. The selection method of structural parameters of the quadrupole electrodes octagonal deflector is proposed. Simulation results show that, under the same crystal and applied voltage, the electric field distribution of the octagonal structural deflector with quadrupole electrodes and ideal electrode structure are consistent in the paraxial region, and the field intensity error is less than 10%. According to the analysis results, an octagonal lithium niobate crystal electro-optic deflector is designed and developed. Experimental results show that the deflection sensitivity of the deflector is 0.312 μrad/V, which is consistent with the theoretical value of 0.340 μrad/V.