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 (${z}$-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 ${z}$-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.

中文翻译：

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通过光学相干因子进行单次表面3D成像

我们报告单次三维（3D）地形成像方法，光学相干因子（OCF）成像，该方法使用光学相干性作为对比机制来获取物体的表面高度（$ {z} $-方向）信息。4-f成像系统记录从物体表面反射的光场。成像系统的照明来自激光源，其光学相干长度可与光学系统的景深（DoF）相媲美。离轴全息记录用于从干涉条纹中检索相干因子，然后将其转换为$ {z} $方向信息。在此实验中，我们验证了我们的3D成像结果，并将其与轴向扫描全场光学相干断层扫描图像进行了比较。我们还分析了OCF的对比度机制，并显示了它能够使用相同的成像设置提供常规相干成像和非相干成像方面的其他信息。这种单次计算有效的方法在工业质量控制检查中可能具有潜在的应用。