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Eschen W, Liu C, Penagos Molina DS, Klas R, Limpert J, Rothhardt J. High-speed and wide-field nanoscale table-top ptychographic EUV imaging and beam characterization with a sCMOS detector. OPTICS EXPRESS 2023; 31:14212-14224. [PMID: 37157290 DOI: 10.1364/oe.485779] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We present high-speed and wide-field EUV ptychography at 13.5 nm wavelength using a table-top high-order harmonic source. Compared to previous measurements, the total measurement time is significantly reduced by up to a factor of five by employing a scientific complementary metal oxide semiconductor (sCMOS) detector that is combined with an optimized multilayer mirror configuration. The fast frame rate of the sCMOS detector enables wide-field imaging with a field of view of 100 µm × 100 µm with an imaging speed of 4.6 Mpix/h. Furthermore, fast EUV wavefront characterization is employed using a combination of the sCMOS detector with orthogonal probe relaxation.
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Kharitonov K, Mehrjoo M, Ruiz-Lopez M, Keitel B, Kreis S, Gang SG, Pan R, Marras A, Correa J, Wunderer CB, Plönjes E. Single-shot ptychography at a soft X-ray free-electron laser. Sci Rep 2022; 12:14430. [PMID: 36002577 PMCID: PMC9402553 DOI: 10.1038/s41598-022-18605-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 08/16/2022] [Indexed: 11/05/2022] Open
Abstract
In this work, single-shot ptychography was adapted to the XUV range and, as a proof of concept, performed at the free-electron laser FLASH at DESY to obtain a high-resolution reconstruction of a test sample. Ptychography is a coherent diffraction imaging technique capable of imaging extended samples with diffraction-limited resolution. However, its scanning nature makes ptychography time-consuming and also prevents its application for mapping of dynamical processes. Single-shot ptychography can be realized by collecting the diffraction patterns of multiple overlapping beams in one shot and, in recent years, several concepts based on two con-focal lenses were employed in the visible regime. Unfortunately, this approach cannot be extended straightforwardly to X-ray wavelengths due to the use of refractive optics. Here, a novel single-shot ptychography setup utilizes a combination of X-ray focusing optics with a two-dimensional beam-splitting diffraction grating. It facilitates single-shot imaging of extended samples at X-ray wavelengths.
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Affiliation(s)
- Konstantin Kharitonov
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Masoud Mehrjoo
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Mabel Ruiz-Lopez
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Barbara Keitel
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Svea Kreis
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Seung-gi Gang
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Rui Pan
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Alessandro Marras
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Jonathan Correa
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Cornelia B. Wunderer
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Elke Plönjes
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
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Deng J, Yao Y, Jiang Y, Chen S, Mooney TM, Klug JA, Marin FS, Roehrig C, Yue K, Preissner C, Cai Z, Lai B, Vogt S. High-resolution ptychographic imaging enabled by high-speed multi-pass scanning. OPTICS EXPRESS 2022; 30:26027-26042. [PMID: 36236801 DOI: 10.1364/oe.460232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 06/18/2022] [Indexed: 06/16/2023]
Abstract
As a coherent diffraction imaging technique, ptychography provides high-spatial resolution beyond Rayleigh's criterion of the focusing optics, but it is also sensitively affected by the decoherence coming from the spatial and temporal variations in the experiment. Here we show that high-speed ptychographic data acquisition with short exposure can effectively reduce the impact from experimental variations. To reach a cumulative dose required for a given resolution, we further demonstrate that a continuous multi-pass scan via high-speed ptychography can achieve high-resolution imaging. This low-dose scan strategy is shown to be more dose-efficient, and has potential for radiation-sensitive sample studies and time-resolved imaging.
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Levitan A, Comin R. Error metrics for partially coherent wave fields. OPTICS LETTERS 2022; 47:2322-2325. [PMID: 35486790 DOI: 10.1364/ol.455955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
Lensless imaging methods that account for partial coherence have become very common in the past decade. However, there are no metrics in use for comparing partially coherent light fields, despite the widespread use of such metrics to compare fully coherent objects and wave fields. Here, we show how reformulating the mean squared error and Fourier ring correlation in terms of quantum state fidelity naturally generalizes them to partially coherent wave fields. These results fill an important gap in the lensless imaging literature and will enable quantitative assessments of the reliability and resolution of reconstructed partially coherent wave fields.
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Abstract
Abstract
Methods of coherent X-ray diffraction imaging of the spatial structure of noncrystalline objects and nanocrystals (nanostructures) are considered. Particular attention is paid to the methods of scanning-based coherent diffraction imaging (ptychography), visualization based on coherent surface scattering with application of correlation spectroscopy approaches, and specific features of visualization using X-ray free-electron laser radiation. The corresponding data in the literature are analyzed to demonstrate the state of the art of the methods of coherent diffraction imaging and fields of their application.
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Kharitonov K, Mehrjoo M, Ruiz-Lopez M, Keitel B, Kreis S, Seyrich M, Pop M, Plönjes E. Flexible ptychography platform to expand the potential of imaging at free electron lasers. OPTICS EXPRESS 2021; 29:22345-22365. [PMID: 34266001 DOI: 10.1364/oe.426931] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 06/20/2021] [Indexed: 06/13/2023]
Abstract
Ptychography, a scanning coherent diffraction imaging method, can produce a high-resolution reconstruction of a sample and, at the same time, of the illuminating beam. The emergence of vacuum ultraviolet and X-ray free electron lasers (FELs) has brought sources with unprecedented characteristics that enable X-ray ptychography with highly intense and ultra-fast short-wavelength pulses. However, the shot-to-shot pulse fluctuations typical for FEL pulses and particularly the partial spatial coherence of self-amplified spontaneous emission (SASE) FELs lead to numerical complexities in the ptychographic algorithms and ultimately restrict the application of ptychography at FELs. We present a general adaptive forward model for ptychography based on automatic differentiation, which is able to perform reconstructions even under these conditions. We applied this model to the first ptychography experiment at FLASH, the Free electron LASer in Hamburg, and obtained a high-resolution reconstruction of the sample as well as the complex wavefronts of individual FLASH pulses together with their coherence properties. This is not possible with more common ptychography algorithms.
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Marchesini S, Shapiro D, Maia FRNC. Introduction to the special issue on Ptychography: software and technical developments. J Appl Crystallogr 2021. [DOI: 10.1107/s1600576721002983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Hagemann J, Vassholz M, Hoeppe H, Osterhoff M, Rosselló JM, Mettin R, Seiboth F, Schropp A, Möller J, Hallmann J, Kim C, Scholz M, Boesenberg U, Schaffer R, Zozulya A, Lu W, Shayduk R, Madsen A, Schroer CG, Salditt T. Single-pulse phase-contrast imaging at free-electron lasers in the hard X-ray regime. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:52-63. [PMID: 33399552 PMCID: PMC7842230 DOI: 10.1107/s160057752001557x] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/24/2020] [Indexed: 05/31/2023]
Abstract
X-ray free-electron lasers (XFELs) have opened up unprecedented opportunities for time-resolved nano-scale imaging with X-rays. Near-field propagation-based imaging, and in particular near-field holography (NFH) in its high-resolution implementation in cone-beam geometry, can offer full-field views of a specimen's dynamics captured by single XFEL pulses. To exploit this capability, for example in optical-pump/X-ray-probe imaging schemes, the stochastic nature of the self-amplified spontaneous emission pulses, i.e. the dynamics of the beam itself, presents a major challenge. In this work, a concept is presented to address the fluctuating illumination wavefronts by sampling the configuration space of SASE pulses before an actual recording, followed by a principal component analysis. This scheme is implemented at the MID (Materials Imaging and Dynamics) instrument of the European XFEL and time-resolved NFH is performed using aberration-corrected nano-focusing compound refractive lenses. Specifically, the dynamics of a micro-fluidic water-jet, which is commonly used as sample delivery system at XFELs, is imaged. The jet exhibits rich dynamics of droplet formation in the break-up regime. Moreover, pump-probe imaging is demonstrated using an infrared pulsed laser to induce cavitation and explosion of the jet.
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Affiliation(s)
- Johannes Hagemann
- Deutsches Elektronen Synchrotron – DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Malte Vassholz
- Institute for X-ray Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Hannes Hoeppe
- Institute for X-ray Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Markus Osterhoff
- Institute for X-ray Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Juan M. Rosselló
- Third Institute of Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Robert Mettin
- Third Institute of Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Frank Seiboth
- Deutsches Elektronen Synchrotron – DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Andreas Schropp
- Deutsches Elektronen Synchrotron – DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Johannes Möller
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Jörg Hallmann
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Chan Kim
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Markus Scholz
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Ulrike Boesenberg
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Robert Schaffer
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Alexey Zozulya
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Wei Lu
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Roman Shayduk
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Anders Madsen
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Christian G. Schroer
- Deutsches Elektronen Synchrotron – DESY, Notkestraße 85, 22607 Hamburg, Germany
- Department Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Tim Salditt
- Institute for X-ray Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
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