Rapid convergence laminated imaging device capable of synchronously collecting double defocus diffraction patterns

Abstract

The invention discloses a rapid convergence laminated imaging device capable of synchronously collecting double defocus diffraction patterns, which comprises a light source, a focusing lens, a sampleand a beam splitter prism which are arranged in sequence, wherein light emitted by the light source passes through the focusing lens to form a focused light beam, after the focused light beam acts with the sample, the focused light beam is divided into a transmission part and a reflection part through the beam splitter prism, a first CCD and a second CCD are respectively placed at different positions of the transmission light path and the reflection light path away from the focus of the focused light beam, the first CCD is placed in front of the focus point, and the second CCD is placed behindthe focus point. According to the invention, the focusing lens, the beam splitter prism and the two CCDs are utilized to synchronously acquire a plurality of images with a plurality of defocusing amounts, the acquired image information is substituted into a light intensity transmission equation to obtain complex amplitude information of the CCD surface, and the information is utilized to construct a reasonable initial guessing value of an object to be measured, and the initial guessing value is substituted into a laminated imaging algorithm, so that the iteration time can be greatly shortened.

Description

technical field [0001] The invention relates to a fast convergence lamination imaging device, in particular to a rapid convergence lamination imaging device for synchronously collecting double defocus diffraction patterns. Background technique [0002] In order to obtain the phase information of the object and expand the application of coherent diffraction imaging technology, the Rodenburg team at the University of Sheffield proposed the stacked imaging method (PIE) in 2004. This method uses a two-dimensional moving illumination probe to overlap and scan the sample. Redundancy of adjacent scans and alternate projection iterations enable large field of view imaging of the sample. Compared with the traditional coherent diffraction imaging technology, this method has faster convergence speed, larger imaging field of view, and stronger robustness. [0003] In order to further improve the convergence speed of stack imaging and shorten its iterative calculation time, domestic and...

AI Technical Summary

Problems solved by technology

Another category is to construct reasonable initial guesses and probes. For example, in the article Single-shot ptychographic iterative engine based on chromatic aberrations published by Jiantai Dou et al. in 2019, the spectral synthesis method was used to construct reasonable initial guesses to achieve Fast convergence of the algorithm, but this method is only suitable for RGB and multi-wavelength lighting

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