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Accelerating ptychographic reconstructions using spectral initializations

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Document pages: 7 pages

Abstract: Ptychography is a promising phase retrieval technique for label-freequantitative phase imaging. Recent advances in phase retrieval algorithmswitnessed the development of spectral methods, in order to accelerate gradientdescent algorithms. Using spectral initializations on experimental data, forthe first time we report three times faster ptychographic reconstructions thanwith a standard gradient descent algorithm and improved resilience to noise.Coming at no additional computational cost compared to gradient-descent-basedalgorithms, spectral methods have the potential to be implemented inlarge-scale iterative ptychographic algorithms.

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