Application

Vortex phenomena are seen in life, such as bathtub vortices that occur when draining water, wake vortices that detach from ships as they travel, tornadoes, typhoons, and ocean circulation. Vortex light (carrying orbital angular momentum, OAM) was first discovered and applied mainly in the field of optics, i.e., the generation of vortex photons and vortex beams, and the concept of vortex beams was first proposed by Coullet et al. in 1989. In 1922, L. Allen et al. theoretically proved the existence of OAM in vortex beams, which pushed the field into the world's forefront.

With the development of three-dimensional display technology, the research of three-dimensional display technology is changing day by day, and people want to get a more realistic visual experience. As a true three-dimensional display technology, holographic display can provide all the depth information needed by the human eye to perceive three-dimensional objects, giving people a comfortable and realistic three-dimensional visual sense. Holographic technology has a wide range of applications in military, medical, commercial and other fields.

Digital holography has attracted much attention for its ability to image 3D scenes from a single viewpoint. Compared with direct imaging, digital holography is an indirect multi-step imaging process that includes optical recording of holograms and numerical computational reconstruction, providing a wide range of application scenarios for computational imaging methods including deep learning. In recent years, incoherent digital holography has attracted much attention due to its high imaging resolution, absence of scattering noise and edge effects, and low cost. Currently, incoherent holography has been applied to aperture imaging, super-resolution imaging, large depth-of-field imaging and lattice light sheet microimaging.