Optimization of Kα bursts for photon energies between 1.7 and 7 keV produced by femtosecond-laser-produced plasmas of different scale length

Ch. Ziener, I. Uschmann, G. Stobrawa, Ch. Reich, P. Gibbon, T. Feurer, A. Morak, S. Düsterer, H. Schwoerer, E. Förster, R. Sauerbrey
2002 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
The conversion efficiency of a 90 fs high-power laser pulse focused onto a solid target into x-ray K␣ line emission was measured. By using three different elements as target material ͑Si, Ti, and Co͒, interesting candidates for fast x-ray diffraction applications were selected. The K␣ output was measured with toroidally bent crystal monochromators combined with a GaAsP Schottky diode. Optimization was performed for different laser intensities as well as for different density scale lengths of a
more » ... scale lengths of a preformed plasma. These different scale lengths were realized by prepulses of different intensities and delay times with respect to the main pulse. Whereas the K␣ yield varied by a factor of 1.8 for different laser intensities, the variation of the density scale length could provide a gain factor up to 4.6 for the K␣ output.
doi:10.1103/physreve.65.066411 pmid:12188839 fatcat:cdyvsasauff3ddcrglghofomgi