Optical scanning holography

Optical scanning holography (OSH) is a unique digital holographic recording technology proposed by Poon and Korpel. In OSH, a structured beam is generated through interference, and the object to be measured is raster scanned with coherent stripes. At the same time, holographic data is acquired pixel by pixel. Holographic data can be displayed directly on real-time electronic devices, such as cathode ray tube (CRT) displays. Or the holographic data can be digitized and stored in the computer in the form of digital holograms.

OSH has some unique advantages compared with traditional digital holographic recording technology. First, OSH does not rely on the interference between the scattered light of the object and the reference light. Therefore OSH can be applied to the field of remote sensing. In addition, OSH can operate in coherent or non-coherent modes. For the non-coherent mode, the phase information of the target object is lost, but the three-dimensional information is still stored. Therefore, incoherent mode OSH can be used to obtain fluorescence holograms in the field of biological detection. Moreover, the acquired hologram and the interference fringes applied to the OSH can be modified by adjusting the functional form of the pupil in the OSH device - this is called pupil engineering, or PSF engineering. Using pupil engineering, hologram encoding, encryption, recognition, and filtering can be performed on-the-fly during the acquisition of holograms. Moreover, OSH can be used to achieve super-resolution and fault reconstruction. OSH also has many applications in three-dimensional display and storage.