Partlo W N, Oldham W G
Appl Opt. 1993 Jun 1;32(16):3009-14. doi: 10.1364/AO.32.003009.
A simple model for the scattering of coherent light through diffusers has been applied to a moving diffuser despeckler in order to estimate the scattering angles, speckle decorrelation length, and interaction between multiple diffusers. A Gaussian model for the diffuser thickness variations has been used to derive a relation between the scattering cone of a diffuser and its decorrelation properties. This model is equivalent to a randomized array of lenslets. The lenslet's thickness and diameter correspond to the characteristic heights and widths of the diffuser roughness. This model predicts that a decrease in the decorrelation distance for two closely spaced counterrotating diffusers is accompanied by an increase in their scattering cone. Simulation and experimental measurements have been used to verify the predictions of this model. Significant speckle decorrelation has been demonstrated for a nanosecondpulsed laser source by using moderate diffuser rotation speeds.
一个用于相干光通过散射体散射的简单模型已被应用于移动散射体去斑器，以估计散射角、散斑去相关长度以及多个散射体之间的相互作用。已使用散射体厚度变化的高斯模型来推导散射体的散射锥与其去相关特性之间的关系。该模型等同于一个随机排列的微透镜阵列。微透镜的厚度和直径对应于散射体粗糙度的特征高度和宽度。该模型预测，两个紧密间隔的反向旋转散射体的去相关距离减小会伴随着它们散射锥的增大。已使用模拟和实验测量来验证该模型的预测。通过使用适度的散射体旋转速度，已证明对于纳秒脉冲激光源有显著的散斑去相关。
