Figure 1
(a) Schematic of the experimental setup. The horizontally polarized soft X-ray pulses were one-dimensionally focused onto the GaAs wafer. The optical laser pulses were vertically polarized, which corresponded to the reflection of p-polarized pulses. The reflected beam was imaged onto the visible CCD camera. (b) Spatial profile of the incident soft X-ray FEL beam. (c) Spatial profile after the 1 mm-width slit. The white dashed circle depicts the incident beam size. |