White-light filaments for atmospheric analysis.
Most long-path remote spectroscopic studies of the atmosphere rely on ambient light or narrow-band lasers. High-power femtosecond laser pulses have been found to propagate in the atmosphere as dynamically self-guided filaments that emit in a continuum from the ultraviolet to the infrared. This white light exhibits a directional behavior with enhanced backward scattering and was detected from an altitude of more than 20 kilometers. This light source opens the way to white-light and nonlinear light detection and ranging applications for atmospheric trace-gas remote sensing or remote identification of aerosols. Air ionization inside the filaments also opens promising perspectives for laser-induced condensation and lightning control. The mobile femtosecond-terawatt laser system, Teramobile, has been constructed to study these applications.
Kasparian
J
J
Teramobile project, Laboratoire de Spectrométrie Ionique et Moléculaire, UMR CNRS 5579, Université Claude Bernard Lyon 1, 43 boulevard du 11 novembre 1918, F-69622 Villeurbanne Cedex, France. jkaspari@lasim.univ-lyon1.fr
Rodriguez
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M
Méjean
G
G
Yu
J
J
Salmon
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E
Wille
H
H
Bourayou
R
R
Frey
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S
Andre
Y B
YB
Mysyrowicz
A
A
Sauerbrey
R
R
Wolf
J P
JP
Wöste
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