A Fresnel incoherent digital holographic single-exposure imaging method and system

Abstract

The invention provides a Fresnel incoherent digital holography single-exposure imaging method and system, including loading a spatial light modulator with a double-lens mode; loading a phase mask with a phase shift angle of 0° on the spatial light modulator; The image acquisition device records the 0° phase shift hologram; the 0° phase shift hologram H is used 1 The 120° phase-shift hologram H was constructed respectively 2 , 240° phase shift hologram H 3 , the complex-valued hologram H is obtained by superimposing the three phase-shift holograms; the complex-valued hologram is reproduced by the angular spectrum diffraction method in the computer. The present invention records a 0° hologram by loading a double-lens phase mask on the spatial light modulator, constructs 120° and 240° holograms by using the hologram, and removes the zero-order image and the conjugate through three-step phase shift interference technology The angular spectrum method is used to reconstruct the superimposed complex-valued hologram to obtain a reconstructed image. This method realizes the coaxial incoherent digital holography single-exposure imaging, which has the advantages of FINCH technology, and provides a strong guarantee for the real-time imaging of incoherent digital holography.

Description

technical field [0001] The invention belongs to the technical field of optical diffraction imaging and incoherent digital holography, and in particular relates to a Fresnel incoherent digital holographic single-exposure imaging method and system. Background technique [0002] In recent years, with the advancement of computers, high-resolution charge-coupled devices (CCDs) and spatial light modulators (SLMs), digital holography has developed rapidly. Limitations, play a unique advantage, the most striking technology is the SLM-based Fresnel Incoherent Correlation Holography (FINCH) proposed by Joseph Rosen et al. FINCH technology does not need to scan or move any optical devices during the recording process, and can quickly obtain the three-dimensional information of the object, realizing the incoherent digital holographic recording of the same path and coaxiality, which has strong stability and high resolution compared with traditional digital holographic imaging , Imaging ...

AI Technical Summary

Problems solved by technology

In 2018, Dong Liang et al. used a geometric phase lens instead of a spatial light modulator and combined it with a camera with a micro-polarizer array. Using parallel phase-shift digital holography technology, a hologram containing multiple phase-shift interference information can be obtained. Through The four-step phase-shift method obtains the composite hologram, and realizes the single-exposure recording of Fresnel incoherent coaxial digital holography. Although the optical path of this method is simple and compact, the reconstructed image quality of the obtained hologram is poor.

Images