Chinese Optics Letters, 2003, 1 (1): 0156, Published Online: Jun. 6, 2006
Competition between multiphoton/tunnel ionization and filamentation induced by powerful femtosecond laser pulses in air 
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320.7120 ultrafast phenomena 320.7150 ultrafast spectroscopy 300.2530 fluorescence laser-induced 020.4180 multiphoton processes
Abstract
In this work we present experiments by focusing 42 femtosecond laser pulses in air using three different focal length lenses: f=100, 30 and 5 cm. For the longest focal length, only the filament, which is a weak plasma column, is observed. When the shorter focal length lens is used, a high density plasma is generated near the geometrical focus and coexists with a weak plasma channel of the filament. Under the tightest focusing condition, filamentation is prevented and only a strong plasma volume appears at the geometrical focus.
W. Liu, Q. Luo, S. L. Chin. Competition between multiphoton/tunnel ionization and filamentation induced by powerful femtosecond laser pulses in air[J]. Chinese Optics Letters, 2003, 1(1): 0156.
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