Journal Article

PUBDB-2021-04227

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase retrieval framework for direct reconstruction of the projected refractive index applied to ptychography and holography

Wittwer, F. (Corresponding author)DESY* ; Hagemann, J.DESY* ; Flenner, S.Extern*HZG* ; Brueckner, D. B.DESY* ; Schroer, C. (Last author)XFEL.EU*DESY*

2022
OSA Washington, DC

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Please use a persistent id in citations: doi:10.1364/OPTICA.447021  doi:10.3204/PUBDB-2021-04227

Abstract: The interaction of an object with a coherent probe often encodes its properties in a complex-valued function, which is then detected in an intensity-only measurement. Phase retrieval methods commonly infer this complex-valued function from the intensity. However, the decoding of the object from the complex-valued function often involves some ambiguity in the phase, e.g., when the phase shift in the object exceeds 2𝜋. Here, we present a phase retrieval framework to directly recover the amplitude and phase of the object. This refractive framework is straightforward to integrate into existing algorithms. As examples, we introduce refractive algorithms for ptychography and near-field holography and demonstrate this method using measured data.

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Contributing Institute(s):

1. FS-PETRA (FS-PETRA)
2. PETRA-S (FS-PETRA-S)
3. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. SFB 986 Z02 - Multiskalige Analyse von Strukturen und Prozessen mit Synchrotronstrahlung und Neutronen (Z02) (221133217) (221133217)

Experiment(s):

1. PETRA Beamline P05 (PETRA III)
2. PETRA Beamline P06 (PETRA III)

Appears in the scientific report 2022

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