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 ∼0.65 mJ, 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.
Original language | English |
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Pages (from-to) | 884-886 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 37 |
Issue number | 5 |
DOIs | |
State | Published - 1 Mar 2012 |