Multi-voltage phase recovery device and method based on photorefractive effect

By using a multi-voltage phase recovery device and method based on photorefractive effect, diffraction intensity images under different voltage conditions are acquired at a fixed position using a photodetector. This solves the problems of mechanical displacement error and alignment error in the detection of phase defects in optical components, and achieves high-precision and fast phase recovery.

CN121829985APending Publication Date: 2026-04-10SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202511944692.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing technologies for detecting phase defects in optical components suffer from mechanical displacement and alignment errors, resulting in low detection accuracy and slow convergence speed.

Method used

A multi-voltage phase recovery device and method based on photorefractive effect is adopted. Diffraction intensity images under different voltage conditions are acquired at a fixed position using a photodetector. The amplitude and phase information of the sample are reconstructed using a nonlinear inversion algorithm to avoid mechanical displacement error and alignment error.

Benefits of technology

It achieves higher detection accuracy and faster convergence speed, avoids the influence of mechanical displacement error and alignment error, and improves the accuracy and efficiency of phase recovery.

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Abstract

A multi-voltage phase recovery device and method based on a photorefractive effect are characterized in that the photorefractive effect is utilized to replace a non-linear effect under a strong light condition, diffraction images after an optical system under different non-linear effect degrees are collected through a photoelectric detector, a reconstruction algorithm based on non-linear inversion is used, and a multi-voltage phase recovery model is obtained. Reconstructing amplitude and phase information of the sample to be measured; compared with a traditional linear multi-plane phase recovery method, the method has the advantages that the multiple diffraction images can be obtained only by changing the voltage without mechanical displacement, the axial mechanical displacement error and the transverse alignment error of the multiple images can be avoided, and therefore the precision is higher, and the convergence speed is higher.
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