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Title: Numerical and experimental study of partial coherence for near-field and far-field ptychography
Authors: Xu, Wenhui
Ning, Shoucong 
Zhang, Fucai
Issue Date: 11-Nov-2021
Publisher: The Optical Society
Citation: Xu, Wenhui, Ning, Shoucong, Zhang, Fucai (2021-11-11). Numerical and experimental study of partial coherence for near-field and far-field ptychography. Optics Express 29 (24) : 40652-40667. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: High degree of coherence is essential in coherent diffraction imaging (CDI). The coherence requirement on the light source varies with the experimental configuration. As a scanning variant of CDI, ptychography has shown great potential for extensive applications. To determine the influence of partially temporal and spatial coherence on near- and far-field ptychography, we have performed a series of numerical simulations and visible light optical experiments. We demonstrated that the near-field is more robust to spatial and temporal decoherence than the far-field. In addition, the far-field is found to be more sensitive to spatial decoherence than to temporal decoherence. Our experiments also show that a known probe estimate with good spatial coherence enables the retrieval qualities to be enhanced dramatically and helps prevent falling into the local minimums in the reconstruction process. Our work would provide a valuable reference for implementing ptychography with sources of limited coherence. © 2021 Optica Publishing Group
Source Title: Optics Express
ISSN: 1094-4087
DOI: 10.1364/oe.445978
Rights: Attribution 4.0 International
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