Optical reconstruction of transparent objects with phase-only SLMs

Abstract

Three approaches for visualization of transparent micro-objects from holographic data using phase-only SLMs are described. The objects are silicon micro-lenses captured in the near infrared by means of digital holographic microscopy and a simulated weakly refracting 3D object with size in the micrometer range. In the first method, profilometric/tomographic data are retrieved from captured holograms and converted into a 3D point cloud which allows for computer generation of multi-view phase holograms using Rayleigh-Sommerfeld formulation. In the second method, the microlens is computationally placed in front of a textured object to simulat e the image of the textured data as seen through the lens. In the third method, direct optical reconstruction of the micrometer object through a digital lens by modifying the phase with the Gerchberg-Saxton algorithm is achieved.

3D Capture and 3D Contents Generation for Holographic Imaging

“…Thus the problem with optical reconstruction was solved. Introduction of a digital magnifying lens at the SLM plane enlarged the reconstructed object to 6 mm [31]. This gives about 240 times magnification in comparison with its original size.…”

“…holograms of weakly refracting transparent object with a size of 25 μm were recorded by a phase-shifting technique [31]. The object had refractive index variation from 1 to 1.004 but due to its small size it gave rise to a strong diffraction.…”