Speaker
Description
If the amplitude and phase of a coherently scattered monochromatic wave can be measured or determined, then that wave can be numerically propagated backwards in time to form a map of the interaction of the wave with an object (i.e. an image). The phase of the wave can often be inferred from a measurement of the intensity pattern alone. This is particularly useful for imaging with X-rays, where atomic resolution can be reached. When imaging with intense pulses from X-ray free-electron lasers, with the goal of capturing processes occurring at ultrafast time scales, assumptions of stationarity of the scattering may break down. Here, I will discuss some methodologies of imaging with XFEL pulses, attempts to take advantage of the dynamics of the sample for imaging, and discuss ways that we might perform imaging in the attosecond domain.