Fig. 1. Schematic of the experiment

Fig. 2. Typical X-ray energy spectra obtained by joint measurement

Fig. 3. Curve of the conversion efficiency from laser to X-rays (50--200 keV) with laser intensity

Fig. 4. Schematic of X-ray point-projection backlight radiography driven by picosecond petawatt laser

Fig. 5. Radiographs of resolution plates and analysis results of the knife-edge method. (a) 20 μm slit radiograph; (b) 200 μm slit radiograph; (c) analysis result of the knife-edge method of 20 μm slit; (d) analysis result of the knife-edge method of 200 μm slit

Fig. 6. Experimental results of the step object. (a) Radiograph; (b) transmission versus mass density

Fig. 7. Micro spray images of metal under typical loading pressure. (a) Density gray image; (b) areal density (left) and volume density (right) distributions

Fig. 8. Compressed images of the inner spherical shell of the target ball at different times with indirect drive. (a) t=2.7 ns; (b) t=4.5 ns; (c) t=4.9 ns