Hard X-ray generation from solids driven by relativistic intensity in the lambda-cubed regime
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- Hou, B., Nees, J., Mordovanakis, A. et al. Appl. Phys. B (2006) 83: 81. doi:10.1007/s00340-005-2085-x
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Interaction of relativistic intensity laser pulses encompassed at focus by a volume of a few wavelengths cubed with solids is examined. Spectroscopy of hard X-rays of several metallic targets, including Cu, Ge, Mo, Ag, and Sn, irradiated in this regime at a high repetition rate (0.4 kHz), has been experimentally studied. The Kα and Kβ peaks of all targets were obtained. Averaged electron temperatures of several tens of keV and total X-ray conversion efficiencies up to 0.02% are calculated. The X-ray source size is measured to be ∼10 micron with varying elliptical shape.