Target atomic number effect on the duration and conversion efficiency of ultrashort x-ray pulses
- 7 October 1996
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (15) , 2172-2174
- https://doi.org/10.1063/1.117155
Abstract
High‐density plasmas produced by 400 fs, 1018 W/cm2 laser pulses are characterized with a transmission grating spectrometer coupled to an x‐ray streak camera. Conversion efficiencies and durations of the soft x‐ray emission in the 0.1–1.2 keV energy range are analyzed for different target materials (Fe, Cu, Mo, Ta, and Pb). Our results show that the x‐ray emission duration is constant for the different materials, with an average value of 4 and 5.7 ps in the 0.8–1.2 keV and 0.2–0.3 keV ranges, respectively. The converstion efficiency is optimal for a Ta target and is about 0.3% for both energy ranges.Keywords
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