(a) Schematic diagram of the Fourier laser machining. The “f” represents the focal distance of the lens. (b) Etching rates of polystyrene and resorcinol-formaldehyde foam using the ArF laser.
Electronic microscope photographs of the resorcinol-formaldehyde foam target. (a) Surface of perturbed resorcinol-formaldehyde foam. (b) Surface of perturbed resorcinol-formaldehyde foam. (c) Cross section of a perturbed target and the trace of the surface.
Schematic view of the x-ray radiography.
(a) Streaked x-ray radiography images of the foam target in the shock compression phase. (b) The ablation front, shock front, and rear surface trajectories observed in the experiment (open triangles, solid squares, open circles) and the computer simulation (solid lines). The origins of time and position are the onset of the main laser irradiation and the initial position of the rear surface of the target, respectively.
(a) Streaked x-ray radiography images of the foam target in the acceleration phase. (b) The center of mass and the rear surface trajectories observed in the experiment (open circles, solid squares) and the simulation (solid line). The origins of time and position are the shock breakout time and the initial position of the rear surface of the target, respectively.
Streaked x-ray radiography images of (a) the accelerated foam target and (b) CH target with the initial surface perturbation. (c) The temporal evolution of the areal-density perturbation growth. The growth factor is the ratio of the areal-density perturbation at each time to that at the shock breakout time. The time origin is defined as the shock breakout time.
The dispersion relation of the RT growth rate for the CH targets accelerated by of glass laser together with the growth rate for the foam target.
Density profiles of the foam and the CH target predicted by the one-dimensional simulation using a hydrodynamic code ILESTA-1D at after the shock breakout time.
RT growth rate calculated from the 1D simulation with a similar condition to the present experiment and RT growth rate observed in the present experiment.
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