High-resolution optical scanning holographic slice imaging method based on variable pupils

Abstract

The invention discloses a high-resolution optical scanning holographic slice imaging method based on variable pupils, belongs to the field of optical scanning and mainly solves problems of large out-of-focus noises existing when images of any two-dimensional slice are reconstructed in the prior art. According to the method, a two-dimensional scanning mirror is used for controlling deflection of a first Fresnel zone plate so as to achieve primary two-dimensional scanning of an object to be detected to obtain a first matrix equation; after a second pupil is deflected, the two-dimensional scanning mirror controls deflection of a second Fresnel zone plate so as to achieve secondary two-dimensional scanning of the object to be detected to obtain a second matrix equation; and the two matrix equations are combined, and a conjugate gradient algorithm is introduced to achieve slice imaging. According to the high-resolution optical scanning holographic slice imaging method based on the variable pupils, by means of the technical scheme, high-accuracy slice imaging is achieved, the out-of-focus noises are greatly reduced, and the method is applicable to each optical field for acquiring slice imaging.

Description

technical field [0001] The invention belongs to the field of optical scanning, and in particular relates to a high-resolution optical scanning holographic slice imaging method based on a variable pupil. Background technique [0002] Optical scanning holography, referred to as OSH, is a non-traditional imaging technology based on Fresnel zone plate scanning, which achieves high-resolution three-dimensional imaging of targets through two-dimensional optical scanning. It is used in biomedical imaging and fluorescent object imaging. , 3D holographic television system and optical remote sensing and other fields have broad application prospects. [0003] The two-dimensional hologram obtained by optical scanning holography technology contains the complete three-dimensional information of the object. Therefore, an important analysis and processing step of the object hologram in optical scanning holography technology is the slice imaging of the object, that is, any two-dimensional se...

AI Technical Summary

Problems solved by technology

[0006] The document 'Depth resolution enhancement in optical scanning holography with a dual-wavelength laser source' proposes a method to improve the axial resolution of slice imaging by using a dual-wavelength laser. It uses lasers with output wavelengths of 632nm and 543nm to obtain two sets of Object hologram, which in turn increases the axial resolution to about 2.5 microns, but its practicality is greatly limited due to the large noise introduced by the two different wavelengths working simultaneously in the optical system

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