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Abstract
A novel non-iterative phase retrieval method is proposed and demonstrated with a proof-of-principle experiment. The method uses a fixed specially designed mask and through-focus intensity measurements. It is demonstrated that this method is robust to spatial partial coherence in the illumination, making it suitable for coherent diffractive imaging using spatially partially coherent light, as well as for coherence characterization.
Highlights
Coherent Diffractive Imaging (CDI) has emerged as a popular method for lensless imaging and phase imaging
Several reconstruction schemes have been developed, and these can be divided in two categories: iterative reconstruction algorithms, and non-iterative methods
The most basic iterative reconstruction algorithms use a single far-field intensity measurement and a support constraint that assumes we know the shape of the object a priori
Summary
Coherent Diffractive Imaging (CDI) has emerged as a popular method for lensless imaging and phase imaging. In CDI, one illuminates a thin sample with coherent light, and one or multiple intensity patterns of the diffracted transmitted field are measured (for example in the far field) With this set of intensity measurements, the complex-valued transmission function of the sample is reconstructed. The most basic iterative reconstruction algorithms use a single far-field intensity measurement and a support constraint that assumes we know the shape of the object a priori. Examples of such algorithms are the Error Reduction and Hybrid Input-Output algorithms [1, 2]. Another method is to take set of through-focus intensity measurements and reconstruct the object from these patterns [4]
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