Fig. 3: Source characterisation.
From: Femtosecond multimodal imaging with a laser-driven X-ray source
a Transmission image of the X-ray beam through a set of metal filters as recorded by the detector: transmission through 136 and 68 μm of copper (Cu1 and Cu2) and through 50 and 100 μm of aluminium (Al1 and Al2) are shown. b The transmission is compared to that of a synchrotron-like spectrum with 17 keV critical energy. The error bars indicate the standard deviation. c Calculated X-ray spectrum for a critical energy of 17 keV as seen at the detector: the laser beam-stop, exit window and air before the detector absorbs the low energy part of the spectrum. The average energy of 10.3 keV is marked with the vertical red line. d Source position fluctuation obtained from 100 consecutive shots. See Supplementary Note 3 for further information.
