(Color online) Schematic of the experimental setup. A prepulse and a main pulse are produced in a Mach-Zehnder interferometer with a variable optical delay line. An x-ray pulse is generated by irradiating a tapelike aluminum target with these pulses using a convex lens. A spatially resolved spectrum is obtained using a pinhole camera with a transmission grating. BS: beam splitter. ND: neutral density filter.
(Color online) Pinhole images (upper) and spatially resolved spectra (lower) of the femtosecond-laser plasmas from the aluminum target. The delay intervals are (a) and (b) . The zero position corresponds to the target surface.
(Color online) Emission spectra for various pulse-separation times (a) at the target surface and (b) from the surface.
Dependence of line emission on the pulse time separation at positions of (circles) and (triangles).
(a) Spatial distributions of line emission for various pulse-separation times. (b) Separation time dependence of expansion length of line emissions: and mixed lines of with .
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