Abstract

X ray radiation as high as 50 keV, including Kα of Ba and Mo, have been observed from a solid target during the interaction of low energy 0.65mJ, 1 kHz 40 femtosecond laser pulses focused in air at atmospheric pressure. Energetic electrons generating such x rays are possibly produced when the field strength in laser pulse wake exceeds the runaway threshold in air. Two dimensional particle-in-cell simulations that include optical field ionization of air and elastic collisions support this mechanism.

© 2012 Optical Society of America

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