Propagation of femtosecond filaments in atmospheric conditions

Noëlle Lascoux; R. Ackermann; Guillaume Méjean; Estelle Salmon; Jérôme Kasparian; Jin Yu; Steffen Frey; R. Salamé; Jean-Pierre Wolf

doi:10.1117/12.753170

9 July 2007 Propagation of femtosecond filaments in atmospheric conditions

Noëlle Lascoux, R. Ackermann, Guillaume Méjean, Estelle Salmon, Jérôme Kasparian, Jin Yu, Steffen Frey, R. Salamé, Jean-Pierre Wolf

Author Affiliations +

Proceedings Volume 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 (2007) https://doi.org/10.1117/12.753170
Event: International Conference on Lasers, Applications, and Technologies '07, 2007, Minsk, Belarus

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 C_n² 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.

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Noëlle Lascoux, R. Ackermann, Guillaume Méjean, Estelle Salmon, Jérôme Kasparian, Jin Yu, Steffen Frey, R. Salamé, and 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); https://doi.org/10.1117/12.753170

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KEYWORDS

Atmospheric propagation

Clouds

Turbulence

Laser beam propagation

Fiber optic gyroscopes

Refractive index

Femtosecond phenomena

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