Abstract
Laser Plasma X-rays (LPX) with a duration of 10 ps or less, emitted from a solid target irradiated by a femtosecond laser pulse, is useful for time-resolved measurements. The intensity of this radiation is 4×109 photons/shot/4πsr at maximum, which corresponds to the conversion efficiency of laser energy into Kα X-rays of 3.4×10-5. By simulations of the interaction of a laser pulse with a solid target, the efficiency is shown to increase more than ten times by suppressing the energy of a laser prepulse.
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