Ultrafast switching of hard X-rays

Gaal, P.; Schick, D.; Herzog, M.; Bojahr, A.; Shayduk, R.; Goldshteyn, J.; Leitenberger, W.; Vrejoiu, I.; Khakhulin, D.; Wulff, M.; Bargheer, M.

doi:10.1107/S1600577513031949

Figure 4
Synchrotron-based time-resolved experiment. (a) Sketch of the experimental set-up showing the fixed timing t of laser and X-ray pulses and the pump–probe delay τ. If the optical excitation pulse arrives earlier at the sample than the gated section of the X-ray probe pulse, the pump–probe delay τ is positive. The probe pulse is divided into three sections: leading edge (1), ultrafast gate (2) and trailing edge (3). (b) Measured (black dots) and simulated (green dash-dotted, black solid, blue dashed and red dotted lines) pump–probe correlation signal X_c. The error bars indicate a confidence interval of ±32%. The simulations were obtained using equation (1)

. The angle $[\theta_{\rm{PS}}]$ is color-coded. All simulations are for the fluence F = 15 mJ cm⁻² used in the experiment. Only the red dotted curve is simulated for an optimized fluence of 20 mJ cm⁻². (c) Shortened X-ray probe pulses for different incident angles on the PicoSwitch color-coded as in (b). The black dashed line is the original X-ray probe pulse. (d) Simulated initial (C₀) and (e) final ( $[C_{{\infty}}]$ ) contrast as defined in Fig. 1

for different Bragg angles on the PicoSwitch. The black solid lines show simulations for a pump fluence of 15 mJ cm⁻². The red dotted lines show a contrast for stronger excitation with a fluence of 20 mJ cm⁻². The colored vertical arrows mark the angles where the probe pulses in (b) and (c) were calculated. The gray shaded area marks the angular resolution of the PXS measurement.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 21| Part 2| January 2014| Pages 380-385

doi:10.1107/S1600577513031949

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