Self-interference digital holography enables holographic recording of object illuminated with spatially incoherent light. While Fresnel incoherent correlation holography (FINCH) has great potential in super-resolution microscopic imaging, structured illumination can be implemented simultaneously to further improve the imaging resolution. In this paper, the imaging characteristics of FINCH with structured illumination are investigated in detail. The basic principle of FINCH with structured illumination is discussed. Effects of characteristics of structured light pattern, such as the period, orientation and modulation depth on lateral-resolution are investigated. The potential of structured illuminated FINCH in three-dimensional super-resolution imaging was demonstrated in the paper.
Compressive sensing has been successfully applied in digital holography (DH), which formulated holography as a compressive sensing problem, thus the reconstruction of hologram is inverted as the decompress and solving the minimization problem. The original information can be reconstructed accurately when the reconstruction conditions are guaranteed in different physical scheme and optical recording set-up. In this paper, the reconstruction conditions are investigated both theoretically and experimentally in near-field Fresnel propagation regime. The effect of recording distance on the physical properties of Fresnel wave propagation is demonstrated, and then show their effect on reconstructed image quality.
Incoherent digital holographic adaptive optics (IDHAO) is a new technology of wavefront sensing and correction. However, the process of the holographic wavefront sensing needs to record digital holograms of object and a guide star independently which reduces the speed of sensing. We present a method for enhancing the operation speed of the IDHAO in this paper. The effects of the size of guide star hologram and the minimum resolvable size of discrete object on compensation of wavefront aberration are discussed. We find that for a discrete object, the hologram of guide star can be extracted from the hologram of the incoherent object. The operation speed of IDHAO system can be enhanced for discrete object by this method. This study improves the potential applications of IDHAO in the field of astronomical observation and so on.