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We report a benchmark experiment that demonstrates shortening of hard x-raypulses in a synchrotron-based optical pump - x-ray probe experiment. The pulseshortening device, a picosecond Bragg switch, reduces the temporal resolutionof an incident x-ray pulse to 7.5 ps. We employ the Bragg switch to monitorpropagating sound waves in nanometer-thin epitaxial films. With theexperimental data we infer pulse duration, diffraction efficiency and switchingcontrast of the device. A detailed efficiency analysis shows, that the switchcan deliver up to 1010 photons/sec in high-repetition rate synchrotronexperiments.

Demonstration of a picosecond Bragg switch for hard x-rays in a synchrotron-based pump-probe experiment