Measurements of nonuniformly heated plasmas with a 2D space-resolved high-speed sampling camera

We developed a two-dimensional space resolved high speed UV sampling camera (2D-HISAC) to study energy transport in laser produced plasmas. The HISAC is composed of an optical bundle fiber coupled to a streak camera to get a two dimensional spatial resolution. The temporal resolution of a few 10 ps was obtained with the 2D-HISAC using multi mode fibers. This 2D- HISAC was applied to the experiments to investigate laser- produced plasmas. Nonlocal heating by high-density relativistic electrons in ultra-intense laser interactions was temporally and 2-D spatially resolved. Observed were filament of the relativistic electron heating in solid targets. The 2D- HISAC was also used in the experiment to estimate uniformity of laser-ablation pressures at an oblique incidence of laser light with a large spot area. Two-dimensional shock heating was temporally resolved, resulting in the distribution of the ablation pressure.