Journal Article aberration correction phase plate ptychography refractive X-ray optics Research Support, Non-U.S. Gov't X-ray free-electron lasers XFELs LPBF Published Erratum Ronchi interferometer TXM X-ray FEL X-ray microscopy compound refractive lens diffract-then-destroy dynamical studies focusing grating interferometry high-resolution techniques laser powder bed fusion operando techniques phase contrast X-ray imaging phase problem pump–probe sample delivery speckle speckle tracking transmission X-ray microscopy wavefront sensing