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Direct measurement 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 find that light trapping in the expanding annular acoustic wave can create the impression of on-axis guiding in a limited temporal window.

preprint2014arXivOpen access
J. K. WahlstrandN. JhajjE. W. RosenthalS. ZahedpourH. M. Milchberg
physics.optics
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Open access5 authors1 topic
Imported metadata coverageMissing code, dataset, citation and institution fields are tracked without dominating the paper.Details
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J. K. WahlstrandN. JhajjE. W. RosenthalS. ZahedpourH. M. Milchberg

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