Strategies for high-throughput focused-beam ptychography
نویسندگان
چکیده
X-ray ptychography is being utilized for a wide range of imaging experiments with a resolution beyond the limit of the X-ray optics used. Introducing a parameter for the ptychographic resolution gain Gp (the ratio of the beam size over the achieved pixel size in the reconstructed image), strategies for data sampling and for increasing imaging throughput when the specimen is at the focus of an X-ray beam are considered. The tradeoffs between large and small illumination spots are examined.
منابع مشابه
Algorithms for Coherent Diffractive Imaging with X-ray Lasers
Daurer, B. J. 2017. Algorithms for Coherent Diffractive Imaging with X-ray Lasers. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1589. 64 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0129-7. Coherent diffractive imaging (CDI) has become a very popular technique over the past two decades. CDI is a "lensless" imaging method whi...
متن کاملFramework for three-dimensional coherent diffraction imaging by focused beam x-ray Bragg ptychography.
We present the framework for convergent beam Bragg ptychography, and, using simulations, we demonstrate that nanocrystals can be ptychographically reconstructed from highly convergent x-ray Bragg diffraction. The ptychographic iterative engine is extended to three dimensions and shown to successfully reconstruct a simulated nanocrystal using overlapping raster scans with a defocused curved beam...
متن کاملPtychographic coherent diffractive imaging with orthogonal probe relaxation.
Ptychography is a scanning coherent diffractive imaging (CDI) technique that relies upon a high level of stability of the illumination during the course of an experiment. This is particularly an issue for coherent short wavelength sources, where the beam intensity is usually tightly focused on the sample in order to maximize the photon flux density on the illuminated region of the sample and th...
متن کاملFly-scan ptychography
We report an experimental ptychography measurement performed in fly-scan mode. With a visible-light laser source, we demonstrate a 5-fold reduction of data acquisition time. By including multiple mutually incoherent modes into the incident illumination, high quality images were successfully reconstructed from blurry diffraction patterns. This approach significantly increases the throughput of p...
متن کاملPtychographic characterization of the wavefield in the focus of reflective hard X-ray optics.
A technique for quantitatively characterizing the complex-valued focal wavefield of arbitrary optics is described and applied to reconstructing the coherent focused beam produced by a reflective/diffractive hard X-ray mirror. This phase-retrieval method, based on ptychography, represents an important advance in X-ray optics characterization because the information obtained and potential resolut...
متن کامل