Abstract
The influence of a prepulse on soft X-ray emission in the range of 50–200 Å from an aluminium plasma produced by 130 fs Ti: Sapphire laser pulses with an intensity of 1014 W/cm2 at normal incidence is studied. An ultrashort prepulse with an intensity of 1013 W/cm2 significantly enhances soft X-ray emission when there is a long time separation ( > 100 ps) between the prepulse and an intense main pulse. It is also observed for the first time that a prepulse with a short pulse time separation can slightly reduce soft X-ray emission, contrary to the previous work done using 248 nm laser pulses. This can be explained qualitatively in terms of the dependence of absorption on the length scale.
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Nakano, H., Nishikawa, T., Ahn, H. et al. Effects of an ultrashort prepulse on soft X-ray generation from an aluminium plasma produced by femtosecond Ti:Sapphire laser pulses. Appl. Phys. B 63, 107–111 (1996). https://doi.org/10.1007/BF01095257
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DOI: https://doi.org/10.1007/BF01095257