Abstract
In the conventional methods of multi-distance phase retrieval, the diffraction intensity patterns are recorded at equal intervals, which can induce slow convergence or stagnation in the subsequent reconstruction process. To solve this problem, a measurement method with unequal intervals is proposed in this paper. The interval spacings between adjacent measurement planes are decreased gradually. A large gap accelerates retrieval progress, and a short span helps to recover detailed information. The proposed approach makes full use of the available measured dataset and simultaneously generates variations in diversity amplitude, which is a crucial issue for the techniques of multi-image phase retrieval. Both computational simulations and experiments are performed. The results demonstrate that this method can improve the convergence speed by 2 to 3 times and enhance the quality of reconstruction results in comparison to that of the conventional methods.
Highlights
IntroductionImage sensors are sensitive to the wavefield intensity. they cannot obtain phase distribution, which is more important in the imaging of some transparent samples
Speaking, image sensors are sensitive to the wavefield intensity
To avoid a complicated experimental setup and redundant noise generated from the modulations, a single-beam multiple-intensity reconstruction (SBMIR) algorithm has been proposed [19,20]
Summary
Image sensors are sensitive to the wavefield intensity. they cannot obtain phase distribution, which is more important in the imaging of some transparent samples. To avoid a complicated experimental setup and redundant noise generated from the modulations, a single-beam multiple-intensity reconstruction (SBMIR) algorithm has been proposed [19,20]. This technique exploits multiple diffractive patterns which are successively measured at diverse distances downstream of the illuminated sample with the same interval step. One of the extended techniques is that which enhances the phase retrieval by means of establishing an intermediate virtual plane between the object plane and the initially measured plane [33] Another method has been proposed to propagate the wavefront in an unordered sequence [34]. The reconstruction error caused by the change in insufficient intensity using the equal interval measurements can be promptly corrected through the unequal interval algorithm
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