Opt Lett. 2020 Apr 1;45(7):1734-1737. doi: 10.1364/OL.384551.
We report a single-shot three-dimensional (3D) topographical imaging method, optical coherence factor (OCF) imaging, which uses optical coherence as the contrast mechanism to acquire the surface height (${z}$z-direction) information of an object. A 4-f imaging system records the light field reflected from the surface of the object. The illumination of the imaging system comes from a laser source with the optical coherence length comparable to the depth of field (DoF) of the optical system. Off-axis holographic recording is used to retrieve the coherence factor from the interference fringes, which is then converted to ${z}$z-direction information. In this experiment, we validate our 3D imaging results comparing them to axial scanning full-field optical coherence tomography images. We also analyze the contrast mechanism of OCF and show that it is able to provide additional information over conventional coherent and incoherent imaging using the same imaging setup. This single-shot computationally efficient method may have potential applications in industrial quality control inspection.
我们报告了一种单次拍摄的三维（3D）地形成像方法，即光学相干因子（OCF）成像，它利用光学相干作为对比机制来获取物体表面高度（${z}$ 方向）的信息。一个 4-f 成像系统记录从物体表面反射的光场。成像系统的照明来自于一个具有与光学系统景深（DoF）相当的光学相干长度的激光源。离轴全息记录用于从干涉条纹中提取相干因子，然后将其转换为 ${z}$ 方向信息。在这个实验中，我们通过与轴向扫描全场光学相干断层扫描图像进行比较，验证了我们的 3D 成像结果。我们还分析了 OCF 的对比机制，并表明它能够在使用相同成像装置的情况下，提供比传统相干和非相干成像更多的信息。这种单次拍摄、计算效率高的方法在工业质量控制检测中可能具有潜在的应用。
