Research on scanning infrared digital holography with large field of view

Due to the development of infrared holography, an efficient infrared imaging method with a large field of view and high resolution is urgently needed. Because of the limitation of detector size, the traditional holographic imaging method can not achieve large area hologram acquisition. In this paper, the infrared in-line digital holography system is presented with a light source of 1550 nm laser. A large field of view and high-resolution holographic imaging is realized via scanning. The sample is moved in X and Y directions by using a two-dimensional electric translation table. When the sample is photographed, the S-type scanning method is adopted to take several holograms. Then the hologram is reconstructed iteratively by MATLAB software, and then all holograms are spliced in order. The infrared digital holograms of simple objects and mineral slices were taken by the imaging system. The experimental results show that scanning infrared digital holography can effectively achieve high-resolution imaging with a large field of view. It can be used in large-scale scene imaging in the future and has good prospects for development in the fields of medicine, petroleum geological exploration and so on.