Dynamic shock compression serves as a crucial tool for creating warm and hot dense matter under extreme conditions that exist throughout the universe such as the interior of planets, supernovae, and astrophysical jets. Converging shocks are particularly valuable as they deliver energy to a small volume, resulting in the compression of material to exceedingly high densities and pressures. The...
While laser powder-bed fusion (LPBF) enables new design paradigms for metals manufacturing, uncertainties persist in connecting the process optimization to the apparently stochastic variability of the resulting properties. Operando X-ray radiography has revealed complex competition between multi-physics phenomena during the melt and solidification processes, resulting in variable turbulence...
Abstract
In this study, we explore the generation of entangled photon pairs through the process of nonlinear Bragg diffraction in the X-ray spectrum to perform X-ray spontaneous parametric down conversion (SPDC). SPDC is traditionally achieved using birefringent nonlinear materials in the visible and near-infrared regime[1]. By orienting the medium (single crystal diamond) and the X-ray...
Near-field inline holography enables imaging of microscopic objects, including biological specimens, offering rapid data acquisition based on full-field imaging. Object-induced phase shifts on a coherent illumination are encoded in interference patterns at the detector. Its intensity distribution is recorded in a hologram. However, the reconstruction of the phase shift from the...
X-ray phase contrast imaging techniques can visualize weakly attenuating samples such as soft materials or biological tissues by exploiting the phase shift that the sample imprints on the incident wavefield. Propagation-based phase contrast imaging (PB-PCI) exploits the self-interference of the diffracted wavefield behind the sample, which gradually evolves into intensity contrast as the...
Improving the spatial and spectral resolution of 2D/3D imaging of the X-ray near-edge absorption structure (XANES) has been a decade-long pursuit to probe local chemical reactions at the nanoscale. However, the poor signal-to-noise ratio in the measured images poses significant challenges in quantitative analysis, especially when the element of interest is at a low concentration. Recently, we...
