Intensity Correlation Properties of X-Ray Beams Split with Laue Diffraction

Beam splitting is one of the main approaches to achieving x-ray ghost imaging,and the intensity correlation between diffraction beam and transmission beam will directly affect the imaging quality.In this paper,we investigate the intensity correlation between the split x-ray beams by Laue diffraction of stress-free crystal.The analysis based on the dynamical theory of x-ray diffraction indicates that the spatial resolution of diffraction image and transmission image are reduced due to the position shift of the exit beam.In the experimental setup,a stress-free crystal with a thickness of hundred-micrometers-level is used for beam splitting.The crystal is in a non-dispersive configuration equipped with a double-crystal monochromator to ensure that the dimension of the diffraction beam and transmission beam are consistent.A correlation coefficient of 0.92 is 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 in the efficient data acquisition of x-ray ghost imaging.