Observation of strong nonlinear interactions in parametric down-conversion of X-rays into ultraviolet radiation
Observation of strong nonlinear interactions in parametric down-conversion of X-rays into ultraviolet radiation
Abstract Nonlinear interactions between X-rays and long wavelength radiation can be used as a powerful atomic-scale probe for light-matter interactions and for properties of valence electrons. However, reported X-ray nonlinear effects were small and their observations required tremendous efforts. Here we report the observation of strong nonlinearities in parametric down-conversion …