Energies and time-resolved spectroscopy of 10-2000-A&#778 emissions from laser plasmas produced by a picosecond laser

Various characteristics of x-ray emission from laser plasmas produced by a picosecond YAG laser (where YAG represents yttrium aluminum garnet) are investigated in the wide wavelength band ranging from 10 to 2000 A&#778 from the point of view that emitted radiation from laser plasmas is applied to many purposes, such as laser fusion, x-ray lasers, x-ray sources, and solid-state physics. In this wide wavelength band, extremely different dependences of x-ray energies on input laser energies are made clear. With a decrease of the wavelength, the slope of the dependences increases. Decay times of emitted x-rays from laser plasmas are approximately proportional to the wavelengths. Computational studies are also performed in the framework of a transient collisional radiative model in order to explain the experimental results.