Fig. 1. The development path of holographic imaging， which is divided into 7 modules： digital holography， phase retrieval， holographic multiplexing， optical diffraction tomography， phase shifting interference， multi-modal and deep learning

Fig. 2. The basic principle of holographic imaging

Fig. 3. Phase-shifting holography

Fig. 4. Off-axis holography

Fig. 5. Off-axis holographic multiplexing imaging

Fig. 6. Digital holographic imaging based on phase retrieval

Fig. 7. Holographic imaging based on single sideband modulation

Fig. 8. Conceptual diagram of 2D synthetic aperture and 3D diffraction tomography

Fig. 9. Examples of quantitative phase images and diffraction tomography images