为了发展性能优良的电光偏转器，采用傍轴近似分析了级联棱镜电光偏转器的折射率梯度等效表达式，总结出了不同几何结构电光偏转器的偏转角和偏转轨迹公式，在此基础上比较研究了4种不同几何结构电光偏转器的偏转特性和偏转轨迹，比较分析了梯形、喇叭形和抛物线形几何结构电光偏转器的偏转灵敏度，为较大角度电光偏转系统的设计提供了有意义的参考。

For the development of fine electro-optic deflectors, an equivalent expression of refractive index gradient in a deflector of cascade crystal prisms was analyzed under the condition of paraxial approximation. Equations of the deflection angle and ray trajectory of an electro-optic deflector with different geometric constructions were summarized and their deflection characteristics were studied by means of numerical analysis. Deflection sensitivities of trapezoidal, horn and parabola shaped deflectors were compared with each other. It is helpful for the design of electro-optic scanners with big deflection angles.