Intensity correlation properties of x-ray beams split with Laue diffraction

Abstract

Beam splitting is one of the main approaches to achieve X-ray ghost imaging, and the intensity correlation between diffraction and transmission beams will directly affect the imaging quality. In this paper, we investigated the intensity correlation between the split X-ray beams by Laue diffraction of stress-free crystals. The analysis based on the dynamical theory of X-ray diffraction indicates that the position shift of the exit beam leads to the reduction in the spatial resolution of both diffraction and transmission images. In the experimental setup, a stress-free crystal with a thickness of hundred-micrometers-level was used for beam splitting, which was in a non-dispersive configuration with a double-crystal monochromator to ensure the consistent dimension of the diffraction and transmission beams. A correlation coefficient of 0.92 was achieved experimentally and the high signal-to-noise ratio of the X-ray ghost imaging is anticipated. Results of this paper demonstrate that the developed beam splitter of Laue crystal has the potential for efficient data acquisition of X-ray ghost imaging.

Tunable energy spectrum betatron x-ray sources in a plasma wakefield

“…[13] These features collectively make betatron sources a promising and potentially significant advance in radiation source technology. [14] Low-energy x-rays are widely used in routine biomed-ical imaging, [15] such as phase-contrast imaging and threedimensional medical imaging of bones, while high-energy xrays can penetrate thicker materials and are therefore widely applied in fields such as materials science, [16] physics [17] and chemistry. [18] Therefore, x-rays need to be flexibly tuned over a wide range of energies; however, both traditional synchrotron radiation sources and laser-plasma betatron radiation sources face several challenges in tuning x-ray energy.…”