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中文摘要：
推导出寄居于高斯光束中的光涡旋偶极子经过半屏衍射后的解析传输公式．利用所得公式对光涡旋偶极子经半屏衍射后的演化做了详细研究．结果表明，与自由空间中光涡旋偶极子演化相比较，衍射场中会出现多对光涡旋偶极子，湮没方式与离轴量有关．随离轴参数的变化，偶极子出现不同的演化特性，但在演化过程中，拓扑电荷守恒．
英文摘要：
The analytical expression for the propagation of an optical vortex dipole （OVD） nested in a Gaussian beam diffracted by a half screen is derived and used to study the evolution of the diffracted OVD. It is shown that Compared with the case of the OVD evolution in free space, multi-pairs of the OVD may take place in the diffracted field, and the annihilation fashion depends on the off-axis displacement. A variety of the evolution behaviors of OVDs appear by varying the off-axis parameter, but the topological charge is conserved in the evolution process.
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