We develop an analytical model for the 3D spatial coherence function of speckle fields generated by scattering of vortex and perfect optical vortex beams. The model is general and describes the spatial coherence along both the transversal and the longitudinal directions. We found that, on propagation, the 3D spatial coherence evolves differently for the different types of initially structured beams, which may affect their use in a variety of sensing applications.

中文翻译：

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涡旋结构光束产生的随机场中的 3D 强度相关性

我们开发了由涡旋和完美光学涡旋光束散射产生的散斑场的 3D 空间相干函数的分析模型。该模型是通用的，描述了沿横向和纵向的空间相干性。我们发现，在传播过程中，不同类型的初始结构光束的 3D 空间相干性演变不同，这可能会影响它们在各种传感应用中的使用。