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Experimental measurements of multiphoton enhanced air breakdown by a subthreshold intensity excimer laser
2009
Journal of Applied Physics
This work presents density, spectroscopic temperature, and shockwave measurements of laser induced breakdown plasma in atmospheric air by subthreshold intensity ͑5.5ϫ 10 9 W / cm 2 ͒ 193 nm laser radiation. Using molecular spectroscopy and two-wavelength interferometry, it is shown that substantial ionization ͑Ͼ10 16 cm −3 ͒ occurs that is not predicted by collisional cascade ͑CC͒ breakdown theory. While the focused laser irradiance is three orders of magnitude below the theoretical collisional
doi:10.1063/1.3245332
fatcat:vpm6lz2icrbh5nqifr5fpcnhui