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Optics Letters

Optics Letters


  • Vol. 30, Iss. 7 — Apr. 1, 2005
  • pp: 759–761

Measuring the electric charge in cloud droplets by use of second-harmonic generation

Véronique Boutou, Catherine Favre, Ludger Woeste, and Jean-Pierre Wolf  »View Author Affiliations

Optics Letters, Vol. 30, Issue 7, pp. 759-761 (2005)

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We report on the observation of second-harmonic generation (SHG) from electrically charged microdroplets while they are excited with femtosecond laser pulses. The intense SHG emission results from chi(3) coupling between two photons of the incident laser pulse and the electrostatic field induced by the surface charges. For I_inc = 2×10¹² W∕cm², we estimate the second-harmonic emission to be I_SHG=2.5×10³ photons per droplet and per pulse. The possibility of using SHG to measure remotely the electric charge of water droplets in thunderclouds is discussed.

© 2005 Optical Society of America

OCIS Codes
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(280.1100) Remote sensing and sensors : Aerosol detection
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

Véronique Boutou, Catherine Favre, Ludger Woeste, and Jean-Pierre Wolf, "Measuring the electric charge in cloud droplets by use of second-harmonic generation," Opt. Lett. 30, 759-761 (2005)

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