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Related Experiment Videos

White-light filaments for atmospheric analysis.

J Kasparian1, M Rodriguez, G Méjean

  • 1Teramobile 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

Science (New York, N.Y.)
|July 5, 2003
PubMed
Summary

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High-power femtosecond laser pulses create self-guided filaments, generating broadband white light detectable from high altitudes. This breakthrough enables advanced atmospheric remote sensing and potential lightning control applications.

Area of Science:

  • Atmospheric Physics
  • Laser Physics
  • Remote Sensing

Background:

  • Traditional remote sensing uses ambient light or narrow-band lasers.
  • Femtosecond laser pulses exhibit unique atmospheric propagation characteristics.

Purpose of the Study:

  • To explore the potential of femtosecond laser-generated white light for atmospheric applications.
  • To investigate the remote sensing capabilities of self-guided laser filaments.

Main Methods:

  • Utilizing a mobile femtosecond-terawatt laser system (Teramobile).
  • Analyzing the propagation of high-power femtosecond laser pulses in the atmosphere.
  • Detecting the broadband white light continuum emitted by laser filaments.

Main Results:

Related Experiment Videos

  • Femtosecond laser pulses form self-guided filaments in the atmosphere.
  • These filaments emit a white light continuum from UV to IR.
  • The white light shows directional behavior with enhanced backward scattering.
  • Detection of this light was achieved from altitudes exceeding 20 kilometers.

Conclusions:

  • The generated white light is a viable source for white-light and nonlinear light detection and ranging.
  • Applications include atmospheric trace-gas remote sensing and aerosol identification.
  • Laser-induced air ionization within filaments offers potential for controlled condensation and lightning modification.