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High-speed coherent diffraction imaging by varying curvature of illumination with a focus tunable lens
Author(s) -
Xiaoliang He,
Suhas P. Veetil,
Zhilong Jiang,
Yan Kong,
Shouyu Wang,
Cheng Liu
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.403147
Subject(s) - optics , wavefront , diffraction , lens (geology) , coherent diffraction imaging , focus (optics) , ptychography , curvature , phase retrieval , detector , translation (biology) , holography , physics , materials science , computer science , fourier transform , biochemistry , chemistry , geometry , mathematics , quantum mechanics , messenger rna , gene
A high-speed coherent diffraction imaging method is proposed by varying the curvature of illumination with a focus tunable lens. The imaging setup is free of conventional mechanical translation and takes only milliseconds to refocus by changing the electric signal applied on the lens. It is more compact and also an inexpensive alternative to coherent diffraction imaging with computerized translational stages. A detector that is kept at a fixed distance from the sample records diffraction patterns each time the spherical wavefront illuminations on the sample is changed with a control current. The complex wavefront of the object is then quantitatively recovered from the diffraction intensity measurements using an iterative phase retrieval algorithm. The feasibility of the proposed method is experimentally verified using various samples. Extremely short response time of the focus tunable lens makes the proposed method highly suitable for applications that requires high speed imaging.

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