Figure 12
Typical images of PAM. (a) Spatial encoding: vertical versus horizontal position; time mapping results form an angle between the laser and the X-ray on the sample (2 µm-thick Si3N4). The temporal window (horizontal) is about 3.6 ps. (b) Spectral encoding image: lateral position versus the wavelength mapped to time by a chirped laser pulse collinear with the X-ray perpendicular to the sample (100 µm-thick YAG:Ce). The temporal window (horizontal axis of the image) is about 1.7 ps. Both show a shadow due to the X-ray-induced opacity change of the sample. At t0 both beams are timed. The horizontal edges in (a) result from the upstream partially closed power slits which are not influencing (b). |