Speaker
Description
When X-ray fluorescence is excited by X-ray pulses with durations approaching the coherence time of the fluorescence, it encodes spatial information about the structure of the fluorescing volume and temporal information about the excitation pulse. Both spatial and temporal information can be revealed by analyzing intensity correlations in the emitted fluorescence, a method sometimes referred to as “incoherent diffractive imaging”.
In this contribution, we report results from our recent measurements of X-ray fluorescence intensity correlations at the Linac Coherent Light Source (LCLS) using thin vanadium foils and sub-femtosecond hard X-ray pulses.
We discuss the amount of information about focus shape and intensity distribution that can be obtained from a single intense shot, and show that intensity correlations could provide a promising route to a shot-resolved nanofocus diagnostics.
In addition, we use the correlation contrast to estimate the mean pulse duration, and present experimental data showing distinct projections of the nanofocus from slightly different angles, recorded on a single detector without the need for rotation.
| Scientific Topics | Imaging |
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