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Extreme focusing of hard X-ray free-electron laser pulses enables 7 nm focus width and 1022 W cm−2 intensity

PhotonicsFree-electron LasersW Cm−2 IntensityEngineeringPhysicsMicroscopyOptical PropertiesApplied PhysicsNm Focus WidthX-ray Free-electron LaserSynchrotron RadiationX-ray OpticExtreme FocusingFree Electron Laser