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Analytic dual-wavelength phase recovery method

A phase recovery and dual-wavelength technology, applied in the field of analytical dual-wavelength phase recovery, can solve problems such as redundancy and high data, and achieve the effect of avoiding convergence stagnation

Pending Publication Date: 2022-02-25
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the existing iterative phase recovery algorithm that requires a large amount of intensity data to improve the convergence performance, resulting in high data redundancy, and to provide an analytical dual-wavelength phase recovery method

Method used

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Embodiment Construction

[0074] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0075] An analytical dual-wavelength phase retrieval method based on a dual-wavelength imaging system such as figure 1 As shown, the dual-wavelength imaging system includes a second light source 2, a second polarizer 4, an imaging objective lens, a CCD image sensor 10, and a first light source 1, a first polarizer 3, and a beam combiner arranged in sequence along the direction of the main optical path. 5. Beam expansion and wave surface shaping device 6 and beam splitter 7; the laser wavelengths of the first light source 1 and the second light source 2 are 550nm and 760nm respectively, and the laser light of the second light source 2 enters the beam combiner 5 through the second polarizer 4 Then exit along the main optical path; the outgoing light of the beam splitter 7 includes the first outgoing light that is vertically incident on the sampl...

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Abstract

The invention relates to coherent diffraction imaging, in particular to an analytic dual-wavelength phase recovery method, which is used for solving the defect of high data redundancy caused by the fact that an existing iterative phase recovery algorithm needs a large amount of intensity data in order to improve convergence performance. According to the analytic dual-wavelength phase recovery method, an iterative optimization algorithm is not used any more, but an analytic solution of the phase is obtained in a mode of solving a high-order equation set, and the problems of non-uniqueness, convergence stagnation and the like of an iterative algorithm solution are avoided.

Description

technical field [0001] The invention relates to coherent diffraction imaging, in particular to an analytical dual-wavelength phase recovery method. Background technique [0002] Coherent Diffraction Imaging (CDI) is a lens-free imaging method that records intensity information and reconstructs samples using phase recovery technology. It has developed rapidly in recent years and is widely used in nanoscale biological material structure measurement, integrated circuit chip Non-destructive measurement of structure and surface topography and other fields (Science, 2015, 348, 530–535; Optica, 2015, 3, 827–835). [0003] Phase recovery technology is the core technology of CDI, including direct phase recovery algorithm and iterative phase recovery algorithm; TIE (Transport Intensity Equation) method is a typical direct phase recovery algorithm, which obtains the phase information of the object through the intensity change along the optical axis , but in the TIE method under cohere...

Claims

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Application Information

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IPC IPC(8): G06T11/00G06F17/16
CPCG06T11/003G06F17/16
Inventor 李拓张朵董军雷文秀
Owner XIAN UNIV OF POSTS & TELECOMM
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