Sander Mathias, Bauer Roman, Kabanova Victoria, Levantino Matteo, Wulff Michael, Pfuetzenreuter Daniel, Schwarzkopf Jutta, Gaal Peter
European Sychrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.
Tailored X-ray Products gGmbH, Berlin, Germany.
J Synchrotron Radiat. 2019 Jul 1;26(Pt 4):1253-1259. doi: 10.1107/S1600577519005356. Epub 2019 Jun 12.
A benchmark experiment is reported that demonstrates the shortening of hard X-ray pulses in a synchrotron-based optical pump-X-ray probe measurement. The pulse-shortening device is a photoacoustic Bragg switch that reduces the temporal resolution of an incident X-ray pulse to approximately 7.5 ps. The Bragg switch is employed to monitor propagating sound waves in nanometer thin epitaxial films. From the experimental data, the pulse duration, diffraction efficiency and switching contrast of the device can be inferred. A detailed efficiency analysis shows that the switch can deliver up to 10 photons s in high-repetition-rate synchrotron experiments.
报道了一项基准实验，该实验展示了在基于同步加速器的光泵浦-X射线探测测量中硬X射线脉冲的缩短。脉冲缩短装置是一种光声布拉格开关，它将入射X射线脉冲的时间分辨率降低到约7.5皮秒。该布拉格开关用于监测纳米级外延薄膜中传播的声波。从实验数据中，可以推断出该装置的脉冲持续时间、衍射效率和开关对比度。详细的效率分析表明，在高重复率同步加速器实验中，该开关每秒可提供多达10个光子。
