Optical scanning holography

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

Compared with the traditional digital holographic recording technology, OSH has some unique advantages. Firstly, OSH does not depend 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. Furthermore, OSH can operate in coherent or non-coherent mode. For incoherent mode, the phase information of the target is lost, but the three-dimensional information is still stored. Therefore, in the field of biological detection, incoherent OSH can be used to obtain fluorescence holograms. In addition, by adjusting the functional form of the pupil in the OSH device, the obtained hologram and the interference fringes applied to OSH can be modified, which is called pupil project or PSF project. Using pupil engineering, we can encode, encrypt, identify and filter the hologram in real time in the process of obtaining the hologram. Moreover, using OSH can realize super-resolution and fault reconstruction. OSH also has many applications in 3D display and storage.