Journal Article X-ray dynamical diffraction third-order nonlinearity X-ray microscopy Bragg case X-ray X-ray Fraunhofer holography image processing nonlinear diffraction reflection region two-wave diffraction Bragg reflection Fourier transform holography Fresnel zone plate interferometer Published Erratum Talbot effect X-ray holography X-ray lens X-ray point focusing X-ray pulse crystal crystals dynamical diffraction eikonal approximation exact solution. image reconstruction nonlinear dynamical diffraction periodic object reconstruction time-dependent propagation equations