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Direct imaging of the acoustic waves generated by femtosecond filaments in air
We present direct measurements of the gas acoustic dynamics following interaction of spatial single- and multi-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates. Results are in excellent agreement with hydrodynamic simulations. Under no conditions for single filaments do we find on-axis enhancement of gas density; this occurs only with multi-filaments. We also investigate the propagation of probe beams in the gas density profile induced by a single extended filament. We finddoi:10.1364/ol.39.001290 pmid:24690729 fatcat:lbnx5kdl6ff2nhuje7z3dedh74