A method for creating digital holograms of incoherent objects, dubbed Fresnel incoherent correlation holography (FINCH), creates holograms by a single-channel, on-axis, incoherent, self-referenced interferometer using white light as the source. FINCH can operate with a wide variety of light sources, and in principle could be made to work at any wavelength in the electromagnetic spectrum. Because of this flexibility, it can be used in high-resolution holographic applications that were not possible in the past because they were limited by the need for coherent laser light. The depth of the object points is encoded by the density of the rings such that points closer to the system project rings that are denser than those from distant points. As a result, the 3D information in the volume being imaged is recorded by the digital camera. Therefore, each plane in the image space reconstructed from the Fresnel hologram is in focus at a different axial distance.
|Number of pages||3|
|Specialist publication||Laser Focus World|
|State||Published - 1 Mar 2013|