At-wavelength optics characterisation via X-ray speckle- and grating-based unified modulated pattern analysis

The current advances in new generation X-ray sources are calling for the development and improvement of high-performance optics. Techniques for high-sensitivity phase sensing and wavefront characterisation, preferably performed at-wavelength, are increasingly required for quality control, optimisation and development of such devices. We here show that the recently proposed unified modulated pattern analysis (UMPA) can be used for these purposes. We characterised two polymer X-ray refractive lenses and quantified the e ect of beam damage and shape errors on their refractive properties. Measurements were performed with two di erent setups for UMPA and validated with conventional X-ray grating interferometry. Due to its adaptability to di erent setups, the ease of implementation and cost-e ectiveness, we expect UMPA to find applications for high-throughput quantitative optics characterisation and wavefront sensing.