9 July 2007 Propagation of femtosecond filaments in atmospheric conditions
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Abstract
The initiation and propagation of a filament generated by ultrashort laser pulses in both fog and turbulent air is investigated experimentally. Filaments can propagate through dense fog, supported by the surrounding photon bath, which is transmitted and re-feeds the filament after he diffracts on a water droplet. Filaments can can also be generated and propagated even after the beam has propagated through strongly turbulent regions, with structure parameters Cn2 up to 5 orders of magnitude larger than encountered in usual atmospheric conditions. Moreover, the filament position within the beam is not affected by the interaction with a turbulent region. This remarkable stability is allowed by the strong Kerr refractive index gradients generated within the filament, which exceed the turbulence-induced refractive index gradients by 2 orders of magnitude.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Noëlle Lascoux, Noëlle Lascoux, R. Ackermann, R. Ackermann, Guillaume Méjean, Guillaume Méjean, Estelle Salmon, Estelle Salmon, Jérôme Kasparian, Jérôme Kasparian, Jin Yu, Jin Yu, Steffen Frey, Steffen Frey, R. Salamé, R. Salamé, Jean-Pierre Wolf, Jean-Pierre Wolf, } "Propagation of femtosecond filaments in atmospheric conditions", Proc. SPIE 6733, International Conference on Lasers, Applications, and Technologies 2007: Environmental Monitoring and Ecological Applications; Optical Sensors in Biological, Chemical, and Engineering Technologies; and Femtosecond Laser Pulse Filamentation, 67332L (9 July 2007); doi: 10.1117/12.753170; https://doi.org/10.1117/12.753170
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